Advances in Multimedia
Volume 2018 (2018), Article ID 2056381, 20 pages
https://doi.org/10.1155/2018/2056381

Research Article

Commercial Video Evaluation via Low-Level Feature Extraction and Selection

Xiangmin Lun,1,2 Mingxuan Wang,² Zhenglin Yu,¹ and Yimin Hou²

¹College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun, China
²School of Automation Engineering, Northeast Electric Power University, Jilin, China

Correspondence should be addressed to Zhenglin Yu; yuzhenglin@cust.edu.cn

Received 1 August 2018; Revised 21 September 2018; Accepted 24 September 2018; Published 10 October 2018

Academic Editor: Alexander Loui

Copyright © 2018 Xiangmin Lun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

To discover the influence of the commercial videos’ low-level features on the popularity of the videos, the feature selection method should be used to get the video features influencing the videos’ evaluation mostly after analyzing the source data and the audiences’ evaluations of the videos. After extracting the low-level features of the videos, this paper improved the Correlation-Based Feature Selection (CFS) method which is widely used and proposed an algorithm named CFS-Spearmen which combined the Spearmen correlation coefficient and the classical CFS to select features. The 4 datasets in UCI machine learning database were employed as the experiment data. The experiment results were compared with the results using traditional CFS, Minimum Redundancy and Maximum Relevance (mRMR). The SVM was used to test the method in this paper. Finally, the proposed method was used in commercial videos’ feature selection and the most influential feature set was obtained.

1. Introduction

As a major kind of commercial multimedia, commercial videos’ popularity is concerned by related companies and producers. There are many factors which influenced the audiences’ evaluation to the commercial videos, such as the actor/actress, director, and story. But it is too subjective if these factors are employed to evaluate the videos. It is because that these factors are not quantitative in the evaluation procedure. So, the importance of design a model to analysis the videos and calculate the evaluation of them should be realized by the researchers [1]. The article [2] proposed an objective video quality evaluation method based on motion and disparity information. The article [3] presented a video quality evaluation method based on Quaternion Singular Value Decomposition. But only a few video features were used in [2, 3]. The video features should include many features such as color features, motion features, and shot features which might be very likely to influence the audiences’ evaluation of the videos. However, the most influential feature set and the relationships between them and the video popularity are still not clear yet. For all the features extracted, we can select the most influential feature set through the feature selection methods according the commercial videos’ evaluation data. Of cause, the feature dimension reduction methods could also be used here.

Different feature set might be selected by different feature selection or dimension reduction methods. The feature dimension reduction algorithms, such as PCA [4, 5], FDA [6], and KPCA [7, 8], would reduce the feature number, while feature selection algorithms would select the optimal feature set from all the original features. Compared with the dimension reduction algorithms, the feature selection maintains the physical meanings of the original features and this is more convenient for data and relationship between features and videos’ popularity analysis [9].

The main idea of feature selection is selecting a few valuable features and removing the useless ones from all the features extracted. The methods, such as embedded methods, Relief [10], mRMR [11], and CFS [12, 13], are widely used now.

For the embedded methods, sparsity regularized feature selection methods were also widely used in some research area such as appearance modeling in visual tracking [14–16]. In these methods, -norm [17] (being called Lasso, presented by Tibshirani in 1996) and -norm based regularization models have been researched for selecting features with joint sparsity across different tasks [18]. These methods select features by adding a penalty term with weight to the objective function of the machine learning model, which restricts the weight of each feature of the model. Feature selection is done in the process of model training, and those features whose coefficients are trained to zero are considered as redundant features. Recently, -norm and -norm model based regularization methods have attracted more and more attention because they can obtain sparser solutions than the methods based on ℓ₁-norm and ℓ2,1-norm [19]. The algorithms typically take a trade-off between a data-fitting loss function term and a sparsity term; therefore there inevitably exists residual in the loss function. However, little is known about such a residual’s impact on the feature selection [20].

For other methods, only the correlation between feature and class was concerned in Relief algorithm but not the correlation between features. So, the selected feature set was not the optimal one [21]. For mRMR algorithm, both the correlation between features and feature-class were concerned to get the best feature set [22]. For the classifier, all the contributions of the features selected by mRMR were same, and the feature set was selected from the original features. The main idea of CFS is selecting the feature set with lower correlation between features and higher correlation between feature and class. After this procedure, the redundant features and the features which were not closely related to the class would be removed. The Pearson linear correlation coefficient was used in [21, 22] by Huanjing Wang and Ningqing Sun to calculate the correlation between features and feature-class. But only linear correlation coefficient could be measured in Pearson formula. For continuous data, discretization methods or kernel density estimation methods should be employed to solve the problem. This procedure would lead to probability estimation error.

So, the effectiveness of the correlation calculation is the key of successfulness of CFS. Currently, some correlation calculation methods were concerned by many researchers, and we should select the best one according to experiment results. Except Pearson Coefficient, some other correlation calculation methods are being used now. Spearman Rank Correlation Coefficient was used in the article of Marie Therese Puth [23] to descript the correlation of two vectors. The experiment result showed that the Spearman Rank Correlation Coefficient is better than Pearson Coefficient. In the research of Xiaoyuan Xu [24], the Spearman Rank Correlation Coefficient was employed to descript the correlation between features of wind speed. In the article of Jing Feng [25], a nonparametric method based on Spearman Rank Correlation Coefficient was proposed to measure the principle of storage degradation failure.

Spearman Rank Correlation Coefficient was not widely used in feature selection yet. In this paper, after extracting the commercial videos low-level features including color features, motion features, and shot features, a CFS-Spearman algorithm is presented and used to process the four datasets, including ‘Cancer’, ‘Glass’, ‘Bank’, and ‘Credit’, in the UCI machine learning database. The experiment results are compared with CFS and mRMR. The LibSVM classifier is utilized to test the effectiveness of CFS-Spearman. Then, the method in this paper is employed to select the low-level features of the commercial videos to predict the popularity of them. The results showed that the proposed method was better than CFS, mRMR, and ℓp-norm based sparsity regularized feature selection.

2. Video Low-Level Features Extraction

2.1. Color Features

Color is an important feature of vision. The color feature set is combined with 10 features including means and variances of Brightness, Contrast, Saturation, Colorfulness, and Simplicity. Brightness is calculated by average the brightness of every pixel in every frame in HSV space. It is similar as Saturation calculation procedure. The Contrast could be expressed by the following formula:

in which, r, g, and b represent red, green, and blue value of a pixel. Var is the variance calculation function [26].

Colorfulness is a parameter reflecting the combination of image’s color. It is defined as

in which

Mean is the function to get the average the input value [27].

To attract the audiences’ attention in the progress of movie making, the director and the cameraman always make the scenes simpler than the objects. The Simplicity is used to measure this character in some article. It is defined in [28] and the final Simplicity is the mean value of every frame.

2.2. Motion Features

Motion features reflect the changing rate of the scene or objects in the videos. It could be regarded as the moving speed between camera and the objects while shooting. In this article, the motion features are calculated as follows. Firstly, every frame is separated into blocks. The pixel barycenter of every block is get, and then, the frame n and the frame n+1 are compared to obtain the barycenter changing rate of the corresponding blocks in the two neighbor frames. The motion feature mean is the mean value of pixel barycenter coordinate changing and the motion feature variance is the variance of it [29].

2.3. Shot Features

Shot features are also important for video evaluation. To get every shot in a video, the key frames, which are located at the edge of the shots, of the video should be selected firstly [30]. We compare the color histogram of every two neighbor frames to calculate the similarity of them. After key frame selection, the four features, “Shot length mean”, “Shot number”, “Shot length variance”, and “Video length”, are calculated.

Then, the 16 features, including “Brightness mean”, “Contrast mean”, “Saturation mean”, “Colorfulness mean”, “Simplicity mean”, “Brightness variance”, “Contrast variance”, “Saturation variance”, “Colorfulness variance”, “Simplicity variance”, “Motion mean”, “Motion variance”, “Trailer length”, “Shot number”, “Shot length mean”, and “Shot length variance”, are get as shown in Figure 1.

Figure 1: Video features extraction procedure.

3. Feature Selection Suing CFS

When the features are extracted, the relationship between features and video evaluation is still not so clear. It is because that some features influence video viewers’ evaluation but others do not. We should select the most influential feature set of the videos’ evaluation. Some feature selection methods might be introduced here.

3.1. mRMR

mRMR is a typical feature dimension reduction method which use mutual information to measure the correlation between two features and feature-class. The formulas are listed as follows:

in which S is the feature set, is the feature number, c is the class index, is the mutual information between the feature and class c, and is the mutual information between the feature and the feature.

The mutual information between x and y here is defined as

Then, we get the criterion of feature selection as follows:

3.2. CFS Algorithm

CFS is a simple feature selection method. It calculates the correlation value between every two features and feature-class to select the features related to classes most closely. As shown in (9) and (10), this method tries to maximize the Ms.

In the formulas above, is a measure of feature set with k features. is the average correlation calculation method of x and y which are all features or feature and class. N is the number of samples. According to formula (10), in the feature set S, the value of will be bigger if the average correlation between features is minor and the average correlation between features and class is bigger. Then, the feature set is an optimized one. This algorithm is called Pearson Correlation Coefficient.

3.3. Spearman Rank Correlation Coefficient

Pearson Correlation Coefficient was employed in traditional CFS. But there are some other correlation calculation methods which could be tested. Spearman Rank Correlation Coefficient is one of them. It could be defined as follows:

In the formula above, we firstly define the random variable X and Y with N samples as . Then, let and be the ranks of and in the corresponding sample. and are the average ranks of the sample. The Spearman Rank Correlation Coefficient described the monotonic dependence of variables X and Y. The monotonic direction could be recognized by the sign of . When Y creases with X creasing, the sign of is positive, and it is negative conversely. Y will not change with X while the sign of is 0.

The linear correlation coefficient is a widely used correlation measurement and it is easy to be calculated. When the random variables are elliptical distribution, the linear correlation coefficient could express the correlation between the variables. But the short points of it is that it is nonexistent when the variables’ first- and second-order moments could not be get, its value should change when the variables distribution function changed, and after nonlinear strictly increasing, the linear relationships between variables would change [24]. It is most important that the relationship could not be expressed accurately while the variables do not distribute as elliptical distribution.

The Spearman Rank Correlation Coefficient is a nonparametric statistic method. Let the rank correlation coefficient of the two variables X and Y be , then

in which and are the cumulative probability of and , respectively.

The two random variables’ rank correlation coefficient is the linear correlation coefficient of the cumulative probability distribution function expressed as . If the inverse function of it exists, the variable distributed as uniform distribution in because of the following formula:

So the rank correlation coefficient is just an expression of relationship after transformation from the original variables to the variables in uniform distribution. Compared with linear correlation coefficient, the rank correlation coefficient’s advantages are as follows: always exist; does not change with edge distribution; does not change after strict nonlinear transform. So, it is chosen in this paper to measure the relationships between feature and feature or feature and class.

4. Experiment Analyzing for Feature Selection

To prove the effectiveness of CFS-Spearman feature selection method in this paper, the 4 datasets, including “Breast-cancer”, “Glass”, “Bank”, and “Credit” in the UCI machine learning database, are used as the experiment data. The detailed information of the 4 datasets is listed in the Table 1. In the experiment procedure, CFS-Spearman feature selection method was employed to select the most important features and the SVM classification was used to test the selected feature sets. In the experiment, 1/10 of all the samples were selected randomly as the testing data and the others were used as the training data. This classification procedure was repeated for 10 times for every dataset. The mean values of the correctly classification rates were showed in the tables and figures to prove the effectiveness of the method in this paper.

Table 1: The 4 datasets in UCI database.

Data set
Sample Number
Feature number
Class number

Breast-cancer
206
8
2

Glass
144
9
2

bank
30
9
2

Credit
998
14
2

The experiment results were got by Matlab and LibSVM tool box. The results of CFS-Spearman feature selection were also compared with the original CFS, mRMR, and ℓp-norm based sparsity regularized feature selection method as shown in the tables. In Tables 3 and 8, the weighted fonts are the correctly classification rate of CFS-Spearman higher than or equal to CFS, mRMR, and ℓp-norm. For ℓp-norm based sparsity regularized feature selection, we obtained the different settings of in every experiment. This parameter was selected by the classification results using SVM.

Table 2 showed the 8 features and classes of dataset “Breast-cancer”. As shown in Table 3, the CFS-Spearman feature selection method, original CFS, mRMR, and ℓp-norm (p=0.9) were used to select the features in this dataset. From the results, it is obvious that the selected features were different in most feature sets. But if using features selected by CFS-Spearman, the correct classification rates were higher than or equal to other methods in all cases.

Table 2: The 8 features and classes of dataset “Breast-cancer”.

Features
Class

1
2
3
4
5
6
7
8

Age
Menopause
Tumour size
Tumour node
Canceration degree
Tumour position
Tumour quadrant
Radiotherapy or not
Benign or malignant

Table 3: Classification results using features selected by different methods.

Feature number
CFS-Spearman
CFS
mRMR
p-norm (p=0.9)

Features
Correct Classification rate ()
Features
Correct Classification Rate ()
Features
Correct Classification rate ()
Features
Correct Classification rate ()

k=1

70.1389

70.1389

70.1389

70.1389

k=2
(4-5)
75
(4,8)
71.5278
(2,5)
74.3056
(2,5)
74.3056

k=3
(1,4-5)
79.1667
(4-5,7)
76.3889
(2,4-5)
75
(2,4-5)
75

k=4
(1,3-5)
75
(4-5,7-8)
74.3056
(2,4-6)
73.6111
(2,4-5,7)
74.3056

k=5
(1,3-6)
75
(1,3-5,8)
74.3056
(2,4-6,8)
74.3056
(2,4-5,7-8)
74.3056

k=6
(1-5,8)
75.6944
(1,3-5,7-8)
75.6944
(2,4-8)
71.5278
(1-2,4-5,7-8)
72.9167

k=7
(1-5,7-8)
73.6111
(1-5,7-8)
73.6111
(1-2,4-8)
75.6944
(1-5,7-8)
71.5278

In the second experiment, the dataset is “Glass”. We can estimate whether a piece of glass is “float glass” or not according to the chemical elements in it. These elements were listed in Table 4. Same as the second experiment, the third one is about one person might be a member of bank or not. The 9 features, like “Age”, “Living area”, “Income”, and so on, were listed in Table 5. The last experiment was about “Credit degree”. There were 14 features in this dataset as shown in Table 6.

Table 4: The 9 features and classes of dataset “Glass”.

Features
Class

1
2
3
4
5
6
7
8
9

Iridium
Sodium
Magnesium
Aluminium
Silicon
Potassium
Calcium
Barium
Iron
Float glass or not

Table 5: The 9 features and classes of dataset “Bank”.

Features
Class

1
2
3
4
5
6
7
8
9

Age
Living area
Income
Marital status
Children umber
Have a Car or not
Deposit
Account exchange
Mortgage
Bank member or not

Table 6: The 14 features and classes of dataset “Credit”.

Features
Class

1
2
3
4
5
6
7

Keeping Time
Credit record
Purpose
Limit
Instalment promise
Personal information
Residence
Credit degree

8
9
10
11
12
13
14

Property rights
Age
Housing
Job
Family number
Cell phone
Foreign worker or not
Credit degree

The correct classification rates were shown in Figure 2. In the figure, (a) showed the classification results of dataset “Breast-cancer”. The red curve is the correct classification rate of CFS in the cases of 1-feature, 2-features, to 7-features. The green curve was for mRMR and the blue one was for CFS-Spearman. The pink curve was for ℓp-norm (p=0.9). The results in this subfigure are same as the data in Table 3.

(a)

(b)

(c)

(d)

Figure 2: Correct classification rates of different datasets using the 3 methods. (a) Correct classification rates for dataset “Breast-cancer”. (b) Correct classification rates for dataset “Glass”. (c) Correct classification rates for dataset “Bank”. (d) Correct classification rates for dataset “Credit”.

Figure 2(b) showed the classification results of dataset “Glass” using different feature selection methods. Correct classification rates of CFS-Spearman algorithm in cases of 1-feature, 2-features, to 7-features were better than original CFS, mRMR, and ℓp-norm (p=0.7). But if we select 8 features, the correct classification rate of CFS-Spearman algorithm was lower. When 4 features were selected, the correct classification rate was highest and the feature set included features 1, 3, 4, and 5 corresponding to Table 4.

As shown in Figure 2(c), for dataset “Bank”, the correct classification rates of CFS-Spearman algorithm in cases of 1-feature, 2-features, to 8-features were better than or equal to original CFS, mRMR, and ℓp-norm (p=0.7). The correct classification rates were all 81.25%. Corresponding to Table 5, when we selected 2 features, the set is constructed by feature 1 and feature 6. When 4 features were selected, the set is combined with feature 1, feature 6, feature 7, and feature 8.

Figure 2(d) showed the classification results of dataset “Credit” using different feature selection methods. Correct classification rates of CFS-Spearman algorithm in cases of 1-feature, 2-features, to 13-features were better than or equal to original CFS, mRMR, and ℓp-norm (p=0.9). When more than 9 features were selected, the correct classification rate reached the highest value 84.2%, and the 9-features set included features 3, 5, 6, 7, 9, 11, 12, 13, and 14 corresponding to Table 4.

From Figure 2, in most cases, the correct classification rates increased with the increasing of feature number until one feature number and then decreased. So, if we want to make a classification with some features like those shown in Table 8, not all features are necessary. Some more important features should be selected by the appropriate feature selection method.

5. Videos Popularity Prediction

In this paper, the CFS-Spearman feature selection method was used in video low-level feature selecting for videos’ popularity prediction. The low-level feature set included 16 features as expressed in the second part of this paper. There are 300 videos, which were downloaded from “Youtube”, used in experiments. The 16 features were extracted for each video and the serial numbers of them were showed in Table 7.

Table 7: Extracted video features and classes.

1
2
3
4
5
6
7
8
Class

Mean of motion
Variance of motion
Mean of brightness
Mean of contrast
Mean of saturation
Mean of colorfulness
Mean of simplicity
Variance of brightness
Good) Bad(0)

9
10
11
12
13
14
15
16

Variance of contrast
Variance of saturation
Variance of colorfulness
Variance of simplicity
Mean of shot length
Variance of shot length
Shot number
Video length
Good) Bad(0)

Table 8: Experiment results for video popularity prediction using different methods.

Feature number
CFS-Spearman
CFS
mRMR
p-norm (p=0.9)

Feature set
Correct classificat-ion rate (%)
Feature set
Correct classificat-ion rate (%)
Feature set
Correct classificat-ion rate (%)
Feature set
Correct classificat-ion rate (%)

k=1

56.6667

56.6667

50.6667

56.6667

k=2
(4,14)
69.3333
(5,14)
59.3333
(4,12)
63.3333
(5,14)
59.3333

k=3
(4,12,14)
78
(5,13-14)
56.6667
(4,12,16)
76
(4,12,14)
64.6667

k=4
(4,7,12,14)
75.3333
(5,13-15)
68.6667
(4,9,12,16)
73.3333
(4,9,12,14)
72

k=5
(2-5,7)
77.3333
(5,12-15)
69.3333
(4,6,9,12,16)
74.6667
(4,5,9,12,14)
74.3333

k=6
(2-5,7,14)
76
(5,12-16)
75.3333
(2,4,6,9,12,16)
74.6667
(2,4,5,9,12,14)
74.6667

k=7
(1-5,7,14)
76
(5-6,12-16)
74.6667
(2,4,6,9,12,15-16)
76
(1,2,4,5,9,12,14)
76

k=8
(1-5,7-8,14)
74.6667
(5-6,10,12-14)
74.6667
(2,4-6,9,12,15-16)
76
(1,2,4-6,9,12,14)
74.6667

k=9
(1-8,14)
74.6667
(5-6,10-16)
74.6667
(2-6,9,12,15-16)
74.6667
(1,2,4-6,9,12,14-15)
74.6667

k=10
(1-8,13-14)
74.6667
(5-6,9-16)
74.6667
(2-6,9-10,12,15-16)
74.6667
(1-6,9,12,14-15)
74.6667

k=11
(1-8,13-15)
74.6667
(4-6,9-16)
74.6667
(2-7,9-10,12,15-16)
74.6667
(1-6,9,12,14-16)
72

k=12
(1-8,12-15)
74.6667
(1,4-6,9-16)
74.6667
(2-7,9-12,15-16)
74.6667
(1-6,8,9,12,14-16)
72

k=13
(1-8,12-16)
76
(1,4-7,9-16)
74.6667
(1-7,9-12,15-16)
74.6667
(1-9,12,14-16)
72

k=14
(1-8,10-14,16)
72
(1,4-16)
76
(1-12,15-16)
74
(1-9,11-12,14-16)
71.6667

k=15
(1-8,10-16)
75.3333
(1,3-16)
75.3333
(1-12,14-16)
75.3333
(1-12,14-16)
75.3333

To evaluate the popularity of them, the audiences’ “Like/Dislike” votes numbers were employed to calculate the popularity degree as shown in

in which LN is the vote number of “like” and DN is the vote number of “dislike” for a video. We set 4.7 as the threshold of classification for “good” videos and “bad” videos. It means that if the score of a video is higher than or equal to 4.7, it is a good video. Otherwise, it is regarded as bad one. All the extracted features were listed in Table 7. We used the four methods to select the features, and the selecting results were shown in Table 8. If the selected features were employed to classify the videos in to two classes, good and bad, the correct classification rates were listed in Table 8.

The SVM classification results showed that most correct classification rates of CFS-Spearman method were higher than that of the other two ones. And when the feature number is 3, the correct classification rates are the highest one which is 78%. And in this case, the features “Mean of contrast”, “Variance of Simplicity”, and “Variance of shot length” were selected as the most influential features. So, they could be used as the feature set to predict the popularity of commercial videos.

The correct classification rates curves were drawn in Figure 3.

Figure 3: Correct classification rate using video features by different methods.

The results in Table 8 were obtained by SVM using the selected feature set. Recently, some classification methods associated with deep learning received wide attention. CNN (convolution neural network) is a popular one within them. To compare the classification effectiveness, CNN was designed to test the prediction of the videos’ popularity in this part using the selected 3 features. The design of CNN used in this paper was shown in Figure 4. Firstly, the selected feature set, including features 1, 3, 4, 5, 6, and 7, were employed as the original input data of CNN. It is because that other features, such as “Variance of motion” and “Variance of shot length”, were just one scalar but not a vector or matrix.

Figure 4: The designed CNN for video popularity prediction.

In contrast with using SVM, the 6 features (features 1, 3, 4, 5, 6, and 7) were not the mean values of every frame in the whole video, but just uniformly selected 500 frames from a video and calculated the 6 features in every selected frame. Then, we get the input data whose size is 500×6 of CNN. The parameters in this framework were set as follows. The convolution and pooling procedure was repeated for 3 times. For the 6 features, there was no any relationship between each other. So, the convolution kernels’ size was set as [m, . The parameters were designed as follows.

For the first time, m₁=51, k₁=500, and there were 4 convolution layers in the procedure. Then, the size of feature map C₁was 4@(450×6). After the first pooling processing with p=2, the size of feature map S₁ was 4@(225×6). For the second time, m₂=76, k₂=225, and there were 10 convolution layers. The size of feature map C₂ was 10@(150×6). The size of feature map S₁ was 10@(75×6). For the third time, m₃=75, k₃=75, and the size of feature map S₃ was 10@(1×6). We convert S₃ to a column shoes size which was (60×1). Then, the video’s 3 features were transformed to a new feature set with 60 numbers. After Softmax classification, the results were obtained. The experiments were repeated for 10 times, as shown in Table 9, just like the experiments using SVM. The testing result showed that the mean correct classification rate was 61.6667, which was much lower than SVM using the 3 selected features. It is because that the 16 features were most scalars which were not suitable for CNN classification.

Table 9: The classification results using CNN.

Correct classification rate (%)
Mean

1
2
3
4
5
6
7
8
9
10

70
63.3333
60
66.6667
56.6667
63.3333
53.3333
56.6667
60
66.6667
61.6667

If we use the whole videos or some frames in them as the input data for CNN, according to the characteristic of CNN, it only pays attention to the differences between the input data in the convolution procedures or tries to get the edges in the images or videos. So, the features such as the 3 selected one, which were proved to be the influential features to the popularity of the videos, would not be calculated in the CNN framework.

6. Conclusions

This paper researched the low-level feature selection methods in commercial videos’ popularity prediction. To select the more influential features in the feature set, the paper proposed a CFS-based method in which the Spearman Correlation Coefficient was employed to take place of original Pearson Correlation Coefficient. To test the method, the data in UCI machine learning database were used as the experiments data source. The widely used algorithm, mRMR, original CFS, -norm based sparsity regularized feature selection, and the method called CFS-Spearman algorithm presented in this paper were compared using the data. Four results showed that the method in this paper was better than the other ones.

Then, to select the influential low-level features for commercial videos, 300 videos were downloaded from Youtube. For each video, 16 features were extracted, and the videos were separated into two classes, “good” and “bad” according to their scores which were calculated through the “like/dislike” number voted by audiences. When the selected feature number is 3 by CFS-Spearman, the correct classification rates is the highest one which is 78%. The features called “Mean of contrast”, “Variance of Simplicity”, and “Variance of shot length” were selected as the most influential ones.

Finally, the SVM classification was compared with the popular classification method CNN. The results showed that because the 16 features were most scalars, the SVM was more suitable for this target.

Appendix

See Table 10.

Table 10

No.
NAME
LINK

1
Chairman of the Board Trailer
 http://www.youtube.com/watch?v=Q6muVAmQ0S0

2
“Daniel der Zauberer” (official trailer) HQ
 http://www.youtube.com/watch?v=W2vKfxXE7_4

3
Dinoshark (2011) - Official Trailer
 http://www.youtube.com/watch?v=9ILns1Y8kOU

4
From Justin To Kelly Trailer
 http://www.youtube.com/watch?v=o6kbtsfZjhk

5
Gigli (2003) Trailer
 https://www.youtube.com/watch?v=4-7iv6-8BRw

6
Growth - Official Trailer [HD]
 http://www.youtube.com/watch?v=GeiPMIC8D-o

7
House of The Dead - Official HD Movie Trailer
 http://www.youtube.com/watch?v=JgfvYJGB2kI

8
House Of The Dead Trailer (2003)
 https://www.youtube.com/watch?v=htx3igt0ksk

9
A Fox's Tale (Kis Vuk) English Trailer
 http://www.youtube.com/watch?v=mubtxYoxmxY

10
Jack and Jill Trailer 2011
 http://www.youtube.com/watch?v=zWZZEmzQh5Q

11
Kaboom Movie Trailer 2011 Official Trailer
 http://www.youtube.com/watch?v=DzmQUQdgGi8

12
Manborg (2012) - Official Trailer - Horror Movies HD
 https://www.youtube.com/watch?v=mBHau4HeTZY

13
Mars Needs Moms Movie Trailer (HD)
 http://www.youtube.com/watch?v=_aS5W___Ezk

14
Mega Python VS Gatoroid (2011) - Official Trailer
 https://www.youtube.com/watch?v=R4yBv4sSKTw

15
Melissa Molinaro - The Hillz (2004) Trailer
 http://www.youtube.com/watch?v=f4SNoskjS-8

16
Outpost 31 - 2013 OFFICIAL Trailer
 http://www.youtube.com/watch?v=WMXdE6sclxQ

17
Back to the Future 4 Official Trailer HD 720p
 http://www.youtube.com/watch?v=GZbylq1Dduw

18
piranhaconda trailer
 http://www.youtube.com/watch?v=fcDaxyLfrNk

19
Quantum Apocalypse 2010 Trailer
 http://www.youtube.com/watch?v=tNVV5n0N_hU

20
Rise of the Animals (2012) - Official Trailer - Horror Movies HD
 http://www.youtube.com/watch?v=UbO0cAcjIqg

21
RoboCop 2013 Trailer (official)
 http://www.youtube.com/watch?v=tfhsXnnXipA

22
Sand Sharks Trailer
 https://www.youtube.com/watch?v=_qEfO5iNicI

23
Sharktopus (2010) - Official Trailer [HD]
 http://www.youtube.com/watch?v=U87zVkIXNI0

24
Son of The Mask 2005 High Quality
 http://www.youtube.com/watch?v=koGT7W2p5Bk

25
Son of the Mask Movie Trailer
 http://www.youtube.com/watch?v=lV5-GRoEt2k

26
Superbabies: Baby Geniuses 2 (2004) Trailer [Official]
 http://www.youtube.com/watch?v=qv7pRNFahts

27
SURF SCHOOL Trailer
 http://www.youtube.com/watch?v=sRJOU0Fi9Ts

28
Bad ass (2012) Official Trailer HD
 http://www.youtube.com/watch?v=T_Wd6XtSmWI

29
The Double (2011) Movie Trailer HD
 http://www.youtube.com/watch?v=pKRKoZIjiFk

30
The Fifth Element (1997) Trailer
 http://www.youtube.com/watch?v=rMNH1-DnX_k

31
The Final Sacrifice Trailer
 http://www.youtube.com/watch?v=ItDcVhhfFb0

32
The Hottie and The Nottie Movie Trailer
 http://www.youtube.com/watch?v=OAU8ArXlWQw

33
The Human Centipede - Official Movie Trailer 2010 [HD]
 http://www.youtube.com/watch?v=YJyWCqkPbzs

34
The Legend of the Psychotic Forest Ranger (2012) - Official Trailer
 http://www.youtube.com/watch?v=ELpf0EOyQSo

35
Bad Kids Go to Hell Official Trailer 2 (2012)
 http://www.youtube.com/watch?v=aSU71Yy5QbI

36
Titanic: The Legend Goes On Trailer
 http://www.youtube.com/watch?v=qvfU5gzAmHg

37
Tony Blair Witch Project - Trailer
 http://www.youtube.com/watch?v=__OcE_MJmqA

38
Trailer - NOOBZ - Official Movie Trailer HD (2012)
 http://www.youtube.com/watch?v=jURf0eVCCIk

39
Transformers 4: The Return of Megatron Trailer HD
 http://www.youtube.com/watch?v=G6qwaNmzLY0

40
Yes Sir! Trailer (Official Version)
http://www.youtube.com/watch?v=1LO7xSZKPIU

41
YOUNG ADULT Trailer 2011 Official [HD]
 http://www.youtube.com/watch?v=Ar_-v7dEEoo

42
Zombie Nation Trailer
 http://www.youtube.com/watch?v=jg-OHwll07Y

43
Battlefield America - Official Exclusive Trailer [HD]
 http://www.youtube.com/watch?v=eEKIq1rVaNk

44
Ben _ Arthur - Trailer
 http://www.youtube.com/watch?v=9XVPOjXmCQ0

45
Book of Shadows Blair Witch 2 [a steFANedit] TRAILER
http://www.youtube.com/watch?v=GbBQ0rwFd20

46
All Superheroes Must Die Official Trailer #1 (2013) - Jason Trost Mo
http://www.youtube.com/watch?v=QCcb5mAeb38

47
New Year's Eve Movie CLIP #2 - This is Not a Training Bra! (2011) H
http://www.youtube.com/watch?v=2LPwJrrlJDk

48
World Of Heroes - Exclusive Superbowl XLIV TV Spot - TRUE 720 HD
http://www.youtube.com/watch?v=vpHpfSK1pYE

49
Re-Kill Official Trailer (2011 Movie)
http://www.youtube.com/watch?v=WQkmEOK5Dik

50
“Snow Doesn't Melt Forever...” (official trailer)
http://www.youtube.com/watch?v=54CI61lo7a4

51
District 13: Ultimatum' Trailer HD
http://www.youtube.com/watch?v=0Nd8qEpskCY

52
Cosmopolis (2012) - Official Trailer [HD]
http://www.youtube.com/watch?v=q3ZmIwteUAY

53
Four (2012) - Official Trailer [HD]
http://www.youtube.com/watch?v=LeXFsP6Zcv8

54
Dark Tide (2012) - Official Trailer [HD]
http://www.youtube.com/watch?v=ZxJYmPRIstE

55
Griff the Invisible (2010) Movie Trailer - HD
 http://www.youtube.com/watch?v=__Z_AdqeDeo

56
Zone Of The Dead - Official Trailer
http://www.youtube.com/watch?v=xl6oeLPwyOk

57
The Wicked Official Teaser Trailer (2012) Horror Movie HD
 http://www.youtube.com/watch?v=tbQ9_NBb1ps

58
The Troll Hunter - Official Trailer
http://www.youtube.com/watch?v=TLEo7H9tqSM

59
American Hustle Trailer
http://www.youtube.com/watch?v=QhB6o3Dtwjs

60
Hammer of the Gods Official Trailer #1 (2013) - Viking Movie HD
http://www.youtube.com/watch?v=MUrL7GcgHO0

61
Tiptoes (2003)
http://www.youtube.com/watch?v=ukRdEVthmWM

62
Superbabies: Baby Geniuses 2 (2004)
http://www.youtube.com/watch?v=qv7pRNFahts

63
Sharktopus (2010)
http://www.youtube.com/watch?v=U87zVkIXNI0

64
Disaster Movie (2008)
 http://www.youtube.com/watch?v=tihG_2BSUqg

65
Vampire Dog (2012)
 http://www.youtube.com/watch?v=_kbS_j2fC4c

66
Super Mario Bros (1993)
http://www.youtube.com/watch?v=wtMZKYnLg5c

67
Empire Of The Apes (2013)
http://www.youtube.com/watch?v=SGBYTcMPPnM

68
C Me Dance (2009)
http://www.youtube.com/watch?v=n-7TM3Udip4

69
Santa With Muscles (1996)
http://www.youtube.com/watch?v=nmPgWz85Us0

70
Quigley (2003)
http://www.youtube.com/watch?v=e6JRvQO8JB0

71
Dinocroc Vs Supergator (2010)
http://www.youtube.com/watch?v=xEV8Fz7xpYI

72
The Hottie & The Nottie (2008)
http://www.youtube.com/watch?v=NiDbKbo2DIE

73
Hobgoblins (1988)
http://www.youtube.com/watch?v=o0fhewrzBRM

74
Samurai Cop (1989)
http://www.youtube.com/watch?v=MTd2BZggats

75
Butterfinger The 13th (2011)
 http://www.youtube.com/watch?feature=player_embedded&v=3k_rel_LhOk

76
Transmorphers (2007)
 http://www.youtube.com/watch?feature=player_embedded&v=4fp7PVK9l0U

77
LOL (2012)
 http://www.youtube.com/watch?feature=player_embedded&v=d4XmycID4eE

78
Anaconda 4: Trail Of Blood (2009)
 http://www.youtube.com/watch?feature=player_embedded&v=P0nKSiNcI1s

79
Mega Python Vs Gatoroid (2011)
 http://www.youtube.com/watch?feature=player_embedded&v=R4yBv4sSKTw

80
A Talking Cat (2013)
http://www.youtube.com/watch?feature=player_embedded&v=Y-h-KpG2tHM

81
Battlefield America (2012)
 http://www.youtube.com/watch?feature=player_embedded&v=wbgSad8w0Pw

82
Mega Shark Vs Giant Octopus (2009)
 http://www.youtube.com/watch?feature=player_embedded&v=Fa7ck5mcd1o

83
Abraham Lincoln: Vampire Hunter (2012)
 http://www.youtube.com/watch?feature=player_embedded&v=wZp7eBStN1U

84
Old Dogs (2009)
 http://www.youtube.com/watch?feature=player_embedded&v=RhY8AP806tU

85
Rottweiler (2004)
 http://www.youtube.com/watch?feature=player_embedded&v=e3uluAacRD0

86
I Hate Valentine’s Day (2009)
 http://www.youtube.com/watch?feature=player_embedded&v=vYrlYGe_YT4

87
The Room (2003)
 http://www.youtube.com/watch?feature=player_embedded&v=yCj8sPCWfUw

88
Age Of The Hobbits (2012)
 http://www.youtube.com/watch?feature=player_embedded&v=tksulgyBdpM

89
Leprechaun (1993)
 http://www.youtube.com/watch?feature=player_embedded&v=0xD8AE8ZcpA

90
1 ROBOCOP - Official Trailer (2014) [HQ]
http://www.youtube.com/watch?v=INmtQXUXez8

91
White House Down - Official Trailer (2013) [HD] Channing Tatum, Jam
http://www.youtube.com/watch?v=4AXbiCdmXgw

92
Scary Movie 5 Official TRAILER #1 (2013) - Charlie Sheen, Ashley Tis
http://www.youtube.com/watch?v=RMDZ8M47j0I

93
Spiders 3D Official Trailer #1 (2013) - Science Fiction Movie HD
http://www.youtube.com/watch?v=M4bjDV1OC0I

94
Evil Dead Trailer 2013 Movie - Official [HD]
http://www.youtube.com/watch?v=FKFDkpHCQz4

95
SHARKNADO - Official Asylum Trailer - TOO VIOLENT FOR TV
http://www.youtube.com/watch?v=iwsqFR5bh6Q

96
Bad Milo Official Trailer #1 (2013) - Ken Marino Comedy HD
http://www.youtube.com/watch?v=aXJ-7oJ9cqA

97
Hell Baby Official Trailer #1 (2013) - Horror Comedy Movie HD
http://www.youtube.com/watch?v=6AaaoMfbx0o

98
DIANA OFFICIAL TRAILER 2013 (HD)
http://www.youtube.com/watch?v=axLcfpj7xeU

99
Killing Season Official Trailer #1 (2013) - Robert De Niro, John Travolt
 http://www.youtube.com/watch?v=_yseYEtQoJQ

100
Iron Sky Official Theatrical Trailer [HD]
 http://www.youtube.com/watch?v=Py_IndUbcxc

101
Adore Official Trailer #1 (2013) - Robin Wright, Naomi Watts Movie H
http://www.youtube.com/watch?v=JjGaV0CEBR0

102
Lincoln Trailer
http://www.youtube.com/watch?v=qiSAbAuLhqs

103
Behind the Candelabra Trailer (Matt Damon - Michael Douglas )
http://www.youtube.com/watch?v=fp3wAyRf15c

104
Assault on Wall Street Official Trailer #1 (2013) - Dominic Purcell, Eri
http://www.youtube.com/watch?v=8Y-NqShTj5w

105
Chennai Express | Official Trailer 2013 | Shah Rukh Khan | Deepika P
http://www.youtube.com/watch?v=4O4mNdMoxDM

106
Rapture-Palooza Official Trailer #2 (2013) - Anna Kendrick Movie HD
 http://www.youtube.com/watch?v=9oaS_N1zsqo

107
∗The Smurfs 2∗ Official Trailer #1 Starring Neil Patrick Harris (2013) [HD]
http://www.youtube.com/watch?v=vQbSGLaVJ5c

108
Temptation Official Trailer #1 (2013) - Tyler Perry Movie HD
http://www.youtube.com/watch?v=SDfTwu2CgDY

109
The Tree of Life Movie Trailer Official (HD)
http://www.youtube.com/watch?v=WXRYA1dxP_0

110
3 Geezers! Trailer
http://www.youtube.com/watch?v=ta31t4BGLDU

111
The Stranger Within Exclusive Official Trailer #1 (2013) HD william bal
http://www.youtube.com/watch?v=exFchSag2QE

112
Jug Face Official Trailer 1 (2013) - Horror Movie HD
http://www.youtube.com/watch?v=WGSvhDcimJg

113
ATLANTIC RIM trailer
http://www.youtube.com/watch?v=TVpQmZmKNmo

114
Twilight Breaking Dawn Part 2 Official Trailer
http://www.youtube.com/watch?v=5xOSoONDpY4

115
Zero Dark Thirty - Official Trailer #2 (HD)
 http://www.youtube.com/watch?v=YxC_JNz5Vbg

116
NTR Jr Ramayya Vasthavayya | Theatrical Trailer | Jr NTR, Samatha
 http://www.youtube.com/watch?v=GYph_ILPGRY

117
Shuddh Desi Romance - Official Theatrical Trailer - Sushant | Parineet
http://www.youtube.com/watch?v=o2Hle83Plpo

118
The Demented Official Trailer 1 (2013) - Horror Movie HD
http://www.youtube.com/watch?v=OuyEfUDSUXg

119
Albatross Official Trailer #1 (2012) HD
http://www.youtube.com/watch?v=KQnXnbQCJDo

120
House of Pleasures Official Trailer #1 - L'Apollonide Movie (2011) HD
 http://www.youtube.com/watch?v=sb_Dgbj_E5c

121
Official Call of Duty®: Ghosts Single Player Campaign Trailer
http://www.youtube.com/watch?v=SumIZb6qMJw

122
Magic Magic Official Trailer #1 (2013) - Michael Cera Movie HD
 http://www.youtube.com/watch?v=elU_AlgW6Lw

123
Wadjda Offical Trailer (2013) - Haifaa Al Mansour
http://www.youtube.com/watch?v=2pcCCbLzhcY

124
The Colony Official International Trailer #1 (2013) - Laurence Fishburn
http://www.youtube.com/watch?v=ZENI7UC3WQo

125
Eden Movie Trailer
http://www.youtube.com/watch?v=pdbI0Fn4COQ

126
Thanks For Sharing Official Trailer #1 (2013)
 http://www.youtube.com/watch?v=CR_OkBBzdew

127
Trailer: RoboCop TRAILER 1 (2014)
http://www.youtube.com/watch?v=UuVphAuRo7Q

128
Need for Speed Official Trailer
http://www.youtube.com/watch?v=fsrJWUVoXeM

129
NEED FOR SPEED Movie Trailer
http://www.youtube.com/watch?v=zGVCdQ2ycmQ

130
Trailer: Her TRAILER 1 (2013) - Joaquin Phoenix, Scarlett Johan
 http://www.youtube.com/watch?v=6QRvTv_tpw0

131
PARADISE Movie Trailer
http://www.youtube.com/watch?v=CEpXPgptx34

132
Jobs Official Trailer #1 (2013) - Ashton Kutcher Movie HD
http://www.youtube.com/watch?v=FrvkCS0ZGPU

133
The To Do List Trailer 2013 Movie - Official [HD]
http://www.youtube.com/watch?v=7UrOOoOXLV8

134
Ender's Game Official Trailer #2 (2013) - Asa Butterfield, Harrison
http://www.youtube.com/watch?v=2UNWLgY-wuo

135
Scary Movie 5 Official TRAILER #1 (2013) - Charlie Sheen, Ashle
http://www.youtube.com/watch?v=RMDZ8M47j0I

136
BOUNTY KILLER Movie Trailer
http://www.youtube.com/watch?v=isE9TBaHkJQ

137
ANOTHER EARTH trailer 2011 official movie
http://www.youtube.com/watch?v=QlPfAYpnpuw

138
Behind the Candelabra Trailer (Matt Damon - Michael Douglas )
http://www.youtube.com/watch?v=fp3wAyRf15c

139
Empire State Official Trailer #1 (2013) - Dwayne Johnson, Liam Hems
http://www.youtube.com/watch?v=EaycdPGK8ek

140
Haunter Official Trailer #1 (2013) - Abigail Breslin Movie HD
http://www.youtube.com/watch?v=sClAdBHrZNg

141
Baggage Claim Trailer 2013 Paula Patton Movie - Official [HD]
http://www.youtube.com/watch?v=UJjCkZF8-R0

142
Special Forces Movie Trailer (2012)
http://www.youtube.com/watch?v=AWZc-Rt1D84

143
WINNIE MANDELA Movie Trailer
http://www.youtube.com/watch?v=d8bGqiZkgd0

144
7500 - Official Movie Trailer
http://www.youtube.com/watch?v=71vXzDCKqDw

145
Biryani official teaser | Karthi, Hansika, Venkat Prabhu, Yuvan, Pre
http://www.youtube.com/watch?v=84uyoMR2dsY

146
Date Movie - Trailer (2006)
 http://www.youtube.com/watch?v=YvnT_Vb-Q3Q

147
Emperor Movie Trailer (2013)
http://www.youtube.com/watch?v=N7mTqpibZ5Q

148
Squirrels Teaser Trailer (2014) - Squirrel Horror Movie HD
http://www.youtube.com/watch?v=q7U2aVUAqPI

149
BA PASS Official Movie Trailer
http://www.youtube.com/watch?v=OmIoYzfANTY

150
Bangaru Kodi Petta - Telugu Movie Trailer - Swathi Reddy & Navdeep
http://www.youtube.com/watch?v=AzswH4UQVmE

151
Ainthu Ainthu Ainthu Movie Trailer - Nikhils Channel
http://www.youtube.com/watch?v=eQap86TpTJw

152
Michael Bay's THE LAST SHIP Series Trailer
http://www.youtube.com/watch?v=4gZ6bpIjeLs

153
Monsters Movie Trailer Official (HD)
 http://www.youtube.com/watch?v=QmR-l3y_coo

154
The Tree of Life Movie Trailer Official (HD)
 http://www.youtube.com/watch?v=WXRYA1dxP_0

155
Fired Trailer | Bollywood Adult Horror Movie | Rahul Bose, Militza Rad
 http://www.youtube.com/watch?v=JX0v_yeLPc4

156
Battle of the Year Trailer 2013 Movie - Official [HD]
http://www.youtube.com/watch?v=QibqRB9Gs9k

157
jOBS Movie CLIP (2013) - Ashton Kutcher Movie HD
http://www.youtube.com/watch?v=3rOiXeKaUUM

158
Vamps Movie Trailer
 http://www.youtube.com/watch?v=eaT2FFZj4_8

159
Naked As We Came (2012) Movie Trailer (Gay Themed) Eshsiz.com
http://www.youtube.com/watch?v=RhD6G0KoaMU

160
Evil Dead Trailer 2013 Movie - Official [HD]
http://www.youtube.com/watch?v=FKFDkpHCQz4

161
NABAR - New Punjabi Movie | Official Theatrical Trailer | Latest Punj
http://www.youtube.com/watch?v=vjvMvvc61Vw

162
Raja Huli Promo Kannada | Yash, Meghana Raj | Latest Kannada Mo
http://www.youtube.com/watch?v=EScH6gQhTRw

163
Lucky (2011) - Movie Trailer - HD
http://www.youtube.com/watch?v=e2eo-95zSp4

164
Samrajyam 2 Son Of Alexander Malayalam Movie Trailer | Unni Muk
http://www.youtube.com/watch?v=61ZX9J1p3hs

165
Metro Official Trailer #2 (2013) - Russian Disaster Movie HD
http://www.youtube.com/watch?v=OKh17zFt8-E

166
Once Upon A Time In Shanghai Official Movie Trailer 2013 in HD
http://www.youtube.com/watch?v=lvkTvaXYvL8

167
Directors special Kannada movie Latest Trailer - Guru Prasad,Ara
http://www.youtube.com/watch?v=qb6dgSzwsW8

168
Spring Breakers Trailer 2013 Selena Gomez Movie - Official [HD]
http://www.youtube.com/watch?v=0GnUAaeHbEw

169
The Assassins Movie Trailer (2013)
http://www.youtube.com/watch?v=cyi2ghkMngI

170
SHELL (film 2013) official UK trailer
http://www.youtube.com/watch?v=NpSCJA38ORY

171
New Moon Movie Trailer - Official (HD)
http://www.youtube.com/watch?v=KYBF3HKzrmE

172
Prom Movie Trailer Official (HD)
http://www.youtube.com/watch?v=VGCtgUNgZKs

173
Youth of Christ- The Movie Trailer
http://www.youtube.com/watch?v=E9xPODBdj-s

174
Universal Soldier 4 Red Band Trailer
http://www.youtube.com/watch?v=aJ0sIny4NTQ

175
Sahara - Movie Trailer
http://www.youtube.com/watch?v=oWJ6gXpI7Ok

176
Hardwired movie Trailer 2009
http://www.youtube.com/watch?v=bdImGZA-2SM

177
Official Watchmen Trailer
http://www.youtube.com/watch?v=R3orQKBxiEg

178
Casino Royale teaser
http://www.youtube.com/watch?v=LozaiZBdji0

179
The official Cloverfield trailer
http://www.youtube.com/watch?v=IvNkGm8mxiM

180
Terminator 4 Salvation teaser trailer 2009 official
 http://www.youtube.com/watch?v=VYc3vOmof_8

181
Battle Los Angeles - Official Movie Trailer #1 (2011) US | HD
http://www.youtube.com/watch?v=0dI94ZO2SbM

182
Mission: Impossible Trailer HQ (1996)
http://www.youtube.com/watch?v=qbg99ykA2bk

183
Marvel's The Avengers Super Bowl XLVI Commercial
http://www.youtube.com/watch?v=bGt-saFvkNk

184
Iron Man 3 Trailer UK - Official Marvel | HD
http://www.youtube.com/watch?v=5EjG-1U3wqA

185
Sleepless In Seattle: Recut as a horror movie
http://www.youtube.com/watch?v=frUPnZMxr08

186
X-Men: First Class Movie Trailer Official (HD)
http://www.youtube.com/watch?v=o8ccSiH4olo

187
Harry Potter and The Deathly Hallows Part 2 Trailer Official (HD)
 http://www.youtube.com/watch?v=I_kDb-pRCds

188
Bubble Trailer
http://www.youtube.com/watch?v=HN9tYb7Q1jA

189
House of The Dead - Official HD Movie Trailer
http://www.youtube.com/watch?v=ek5AZVonwv4

190
Paranormal Activity 2' Trailer
http://www.youtube.com/watch?v=07XbSk7Rjt4

191
Pirates of the Caribbean 3 - At World's End Trailer
http://www.youtube.com/watch?v=PetrAmq9fcw

192
District 9 - Official Trailer 2 [HD]
http://www.youtube.com/watch?v=d6PDlMggROA

193
The Departed - Trailer - (2006) - HQ
http://www.youtube.com/watch?v=SGWvwjZ0eDc

194
Iron Man 2 Trailer
http://www.youtube.com/watch?v=siQgD9qOhRs

195
THE CRAZIES - Trailer
http://www.youtube.com/watch?v=J7w9uWFIMBs

196
The Dark Knight HD 1080p Trailer
http://www.youtube.com/watch?v=yQ5U8suTUw0

197
‘Inception’ Trailer 2 HD
http://www.youtube.com/watch?v=66TuSJo4dZM

198
The Dark Knight Rises - Official Trailer #3 [HD]
http://www.youtube.com/watch?v=g8evyE9TuYk

199
The Hobbit: An Unexpected Journey
http://www.youtube.com/watch?v=SDnYMbYB-nU

200
World War Z Official Trailer #1 (2013) - Brad Pitt Movie HD
http://www.youtube.com/watch?v=Md6Dvxdr0AQ

201
Independence Day - Official® Trailer [HD]
http://www.youtube.com/watch?v=UqNRkA0Zq3Q

202
Prometheus - Official Full HD Trailer
http://www.youtube.com/watch?v=HHcHYisZFLU

203
Transformers 3 Dark of the Moon Teaser Trailer - Official (HD)
http://www.youtube.com/watch?v=3H8bnKdf654

204
Rise of the Planet of the Apes - HD Trailer 2 - (2011)
http://www.youtube.com/watch?v=T3tidwW1gGM

205
Harry Potter and the Sorcerer's Stone Trailer
http://www.youtube.com/watch?v=geNlXmmIp7w

206
RESIDENT EVIL 5 Retribution Trailer 2 - 2012 Movie - Official [HD]
http://www.youtube.com/watch?v=HYuxE3YetQo

207
TOTAL RECALL Trailer 2012 Movie - Official [HD]
http://www.youtube.com/watch?v=4SerZm7DheA

208
Trailer: GREAT GATSBY Trailer (2012) Movie HD
http://www.youtube.com/watch?v=rARN6agiW7o

209
THE LUCKY ONE Trailer 2012 Movie - Official [HD]
http://www.youtube.com/watch?v=9w8lE83oYeM

210
TED Movie Trailer 2012 - Official [HD]
http://www.youtube.com/watch?v=3Vl5q06UElM

211
FLIGHT Trailer 2012 Denzel Washington Movie - Official [HD]
http://www.youtube.com/watch?v=xnVNNR6CEOE

212
Killing Them Softly Trailer 2012 Brad Pitt Movie - Official [HD]
http://www.youtube.com/watch?v=6S8sGrqgwaA

213
Jarhead Trailer HD
http://www.youtube.com/watch?v=JEihaz6FcWs

214
Stand Up Guys Official Trailer #1 (2012)
http://www.youtube.com/watch?v=8h6voLvn8jA

215
Trailer: Pitch Perfect Trailer (2012)
http://www.youtube.com/watch?v=QCekEuGEbEI

216
Seven Psychopaths Official Trailer #1 (2012)
http://www.youtube.com/watch?v=jsHR77oQKEY

217
RUBY SPARKS Trailer 2012 Movie - Official [HD]
http://www.youtube.com/watch?v=W4RJYlSgDKM

218
Wreck-It Ralph Official Trailer #1 (2012)
http://www.youtube.com/watch?v=vf4r5q8-aWo

219
Trailer: Hit And Run Official Trailer #1 (2012)
http://www.youtube.com/watch?v=CnIgYTF1UJA

220
The Amazing Spider-Man New Trailer 2 Official 2012 HD]
http://www.youtube.com/watch?v=atCfTRMyjGU

221
The Lone Ranger Official Trailer #2 (2012) - Johnny Depp Movie HD
http://www.youtube.com/watch?v=JjFsNSoDZK8

222
THE CAMPAIGN Trailer 2012 - Will Ferrell movie - Official [HD]
http://www.youtube.com/watch?v=5JkHxfi4c3I

223
Pitch Perfect Trailer Clip - 2012 Movie - Official [HD]
 http://www.youtube.com/watch?v=tNfDYmuY-_c

224
Hitchcock Trailer 2012
http://www.youtube.com/watch?v=Q7vYhtfNM9U

225
Forrest Gump Trailer (Movie release: July 6, 1994)
http://www.youtube.com/watch?v=JdsMqRaz2WY

226
Trailer: The Butterfly Room TRAILER 1 (2012)
http://www.youtube.com/watch?v=rtFQZfaH5FQ

227
Best New Movie Trailers - February 2012 HD
 http://www.youtube.com/watch?v=pS_rzjmN7so

228
The Imposter - Official Trailer HD (2012)
 http://www.youtube.com/watch?v=2LuFOX0Sy_o

229
Iron Man 2 Trailer 2 (OFFICIAL)
http://www.youtube.com/watch?v=FNQowwwwYa0

230
500 Days of Summer
http://www.youtube.com/watch?v=PsD0NpFSADM

231
Pirates of the Caribbean: On Strange Tides - Trailer 1
 http://www.youtube.com/watch?v=KR_9A-cUEJc

232
SOURCE CODE - Trailer
http://www.youtube.com/watch?v=mnJegNyAb1w

233
Official SALT Trailer - In Theaters 7/23/2010
http://www.youtube.com/watch?v=QZ40WlshNwU

234
FANTASTIC MR. FOX
http://www.youtube.com/watch?v=n2igjYFojUo

235
John Carter Trailer
http://www.youtube.com/watch?v=nlvYKl1fjBI

236
JUST WRIGHT - Official trailer
http://www.youtube.com/watch?v=ZHYSeSAXQf4

237
Bad Teacher- Trailer
http://www.youtube.com/watch?v=GahC5cVsU6A

238
Supernatural Comedy Trailer HD
http://www.youtube.com/watch?v=vDYBrWP1Iwg

239
Predators Trailer
http://www.youtube.com/watch?v=9u8vZwvP57Y

240
GASLAND Trailer 2010
http://www.youtube.com/watch?v=dZe1AeH0Qz8

241
I Spit On Your Grave (2010) - Official Trailer [HD]
http://www.youtube.com/watch?v=HC9p7SkJPwE

242
The Social Network Official Trailer
http://www.youtube.com/watch?v=lB95KLmpLR4

243
New Beastly Movie Trailer - Official
http://www.youtube.com/watch?v=Neo6W1f7hyY

244
“Shutter Island” - Official Trailer [HD]
http://www.youtube.com/watch?v=5iaYLCiq5RM

245
Carriers Trailer(HD)
http://www.youtube.com/watch?v=IwH4bxNK8Os

246
The Crazies - Official Trailer [HD]
http://www.youtube.com/watch?v=mepo50RuhdM

247
“Brothers” - Official Trailer [HQ HD]
http://www.youtube.com/watch?v=7xYyCCjLpZs

248
SURROGATES - Bruce Willis
http://www.youtube.com/watch?v=0T7isP62pdU

249
Julie & Julia - Official Trailer
http://www.youtube.com/watch?v=ozRK7VXQl-k

250
LITERAL Tron Legacy Trailer Parody
http://www.youtube.com/watch?v=UCmeQaXuFig

251
The Hurt Locker - Official Trailer [HD]
http://www.youtube.com/watch?v=2GxSDZc8etg

252
8 Mile Official Trailer #1 - (2002) HD
http://www.youtube.com/watch?v=axGVrfwm9L4

253
Road To Perdition Trailer (2002) [HD]
 http://www.youtube.com/watch?v=k1iCd___dNY

254
A Walk To Remember Official Trailer (HD)
http://www.youtube.com/watch?v=R3b19svqbls

255
Spider Man - Trailer
http://www.youtube.com/watch?v=9p3PIUVzLgE

256
Immortals - Official Trailer [HD]
http://www.youtube.com/watch?v=7VdONYkKFmQ

257
The Tree of Life Movie Trailer Official (HD)
 http://www.youtube.com/watch?v=WXRYA1dxP_0

258
What's Your Number? Official Movie Trailer 2011 HD
http://www.youtube.com/watch?v=TKL-yt4F0B0

259
The Darkest Hour Trailer 2011 Movie Official HD
http://www.youtube.com/watch?v=JZ42p40qDEc

260
The Bucket List Official Trailer #1 - (2007) HD
http://www.youtube.com/watch?v=vc3mkG21ob4

261
Halloween 2007 Trailer (HD)
http://www.youtube.com/watch?v=MhyZmUeq6do

262
ANOTHER EARTH trailer 2011
http://www.youtube.com/watch?v=QlPfAYpnpuw

263
John Carter Fan Trailer 2 “Heritage”
http://www.youtube.com/watch?v=OzPVYy7LHIo

264
REC 2 - Official Trailer [HD]
http://www.youtube.com/watch?v=G18Y-S8YrQ0

265
GONE Trailer 2012 - Amanda Seyfried Movie - Official [HD]
http://www.youtube.com/watch?v=xQYztnrUIwk

266
The Human Experience - Official Trailer [HD]
http://www.youtube.com/watch?v=ctyX5ItSQEI

267
Paranormal Activity 4 Trailer # Extended
http://www.youtube.com/watch?v=g4yp2t7Doac

268
Casino Royale - Official® Trailer [HD]
http://www.youtube.com/watch?v=xK7PbujRUOk

269
Serenity (2005) Trailer 1080p HD
http://www.youtube.com/watch?v=JY3u7bB7dZk

270
Harry Potter and the Goblet of Fire - Official Trailer 720p HD
http://www.youtube.com/watch?v=aFhCLiGvb08

271
Motorstorm E3 2005 trailer
http://www.youtube.com/watch?v=wig-XT8Rbiw

272
The Bourne Supremacy - Official HD Trailer
http://www.youtube.com/watch?v=WrWTJv0yEyI

273
Being Flynn Official Trailer #1
http://www.youtube.com/watch?v=NHZfQDgkqiM

274
Puss in Boots (2011)
http://www.youtube.com/watch?v=55gmAtakjJ4

275
I'll Be Seeing You (2004) HD
http://www.youtube.com/watch?v=ielkiD8w-M8

276
Iron Man 3 Official Trailer (2013) Marvel Movie HD
http://www.youtube.com/watch?v=aV8H7kszXqo

277
A Haunted House Official Trailer #1 (2013)
http://www.youtube.com/watch?v=J50vA5VLR6k

278
Now You See Me Official Trailer #1 (2013)
http://www.youtube.com/watch?v=2h7Oym1EH8s

279
Pacific Rim Official Trailer #1 (2013)
http://www.youtube.com/watch?v=K-ZcqwvQbas

280
The Place Beyond the Pines Official Trailer #1 (2013)
http://www.youtube.com/watch?v=G07pSbHLXgg

281
The Tower Official Trailer #1 (2013)
http://www.youtube.com/watch?v=ljiBRTKc0Wc

282
Star Trek Into Darkness (NEW) Official Trailer (2013)
http://www.youtube.com/watch?v=4g2gRpp4poU

283
Die Hard 5 Official Trailer (2013)
http://www.youtube.com/watch?v=FRLwoMXaZHQ

284
Identity Thief Trailer 2012 Official [HD]
http://www.youtube.com/watch?v=mgJj7Yj013A

285
Red 2 Official Trailer #1 (2013)
http://www.youtube.com/watch?v=sCM3HhGUJsM

286
Safe Haven Trailer 2013 Movie Nicholas Sparks - Official [HD]
http://www.youtube.com/watch?v=ejQEdUwv0ew

287
The Heat Official Trailer #1 (2013)
http://www.youtube.com/watch?v=c-KKx0lcn2A

288
Anchorman 2: The Legend Continues Official Teaser (2013)
http://www.youtube.com/watch?v=jZcJk-RTppI

289
The Host Trailer #2 - 2013 Movie - Official [HD]
http://www.youtube.com/watch?v=uq198cWjCLQ

290
Jack the Giant Killer Trailer 2012 Official 2013 Movie [HD]
 http://www.youtube.com/watch?v=bg0ibhX_84U

291
p] Official Rurouni Kenshin Action Movie Promo Trailer 2012
http://www.youtube.com/watch?v=4WNi8z5EWuE

292
TRON: LEGACY Official Trailer
http://www.youtube.com/watch?v=L9szn1QQfas

293
Trailer: Man of Steel Teaser
http://www.youtube.com/watch?v=ly--gT1RJdk

294
Trailer: Oz the Great and Powerful TRAILER (2013)
http://www.youtube.com/watch?v=Bl88aSxUvls

295
End Of Watch Official Trailer #1 (2012) Jake Gyllenhaal Movie HD
http://www.youtube.com/watch?v=waclIzt1JL8

296
Dark Shadows Trailer (Tim Burton)
http://www.youtube.com/watch?v=6Eo766iZZ0c

297
The Man With The Iron Fists Trailer 2012 Movie - Official [HD]
http://www.youtube.com/watch?v=0A57zjclmoI

298
The Dark Knight Rises trailer 2012
http://www.youtube.com/watch?v=M-mf5IyVIAc

299
SKYFALL - Official Teaser Trailer
http://www.youtube.com/watch?v=24mTIE4D9JM

300
MEN IN BLACK 3 - Official Trailer
 http://www.youtube.com/watch?v=IyaFEBI_L24

Data Availability

The data used to support the findings of this study are included within the article.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

The research work of this paper was supported by the Science and Technology Development Program Fund of Science and Technology Department Jilin province, China (no. 20150414051GH).

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