Quality evaluation method and device for uploaded videos of websites
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A technology of video quality and evaluation method, which is applied in the field of video, can solve problems such as no video, and achieve the effect of high application value
Active Publication Date: 2013-11-27
ALIBABA (CHINA) CO LTD
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Problems solved by technology
Faced with such a complex website uploading videos, there is currently no simple and accurate video-free objective quality evaluation algorithm in the industry
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Embodiment 1
[0061] In Embodiment 1, the method of the present invention is used to evaluate an uploaded video compressed with a 1280x720P H.264 main profile and with a higher bit rate.
[0062] First, by parsing the uploaded video file, the encoding format src_coding_type=H264main profile of the upload source video is obtained, the encoding bitrate of the upload source video is src_coding_bitrate=55800kpbs, and the resolution src_resolution of the upload source video is 1280x720.
[0063] Get the video peak signal-to-noise ratio psnr_1pass=40.267db after the 1-pass transcoding is completed.
[0064] According to the encoding format lookup table 1, obtain the bit rate loss rate loss_factor=1 corresponding to the upload source encoding format H264.
[0065] Calculate the bit rate video dynamics weighting factor (unit: kbps) br_mot_factor, where the value of the reference motion video peak signal-to-noise ratio psnr_mot_base is set to 37, the upper limit value of br_mot_factor is set to 4, and the lo...
Embodiment 2
[0071] Embodiment 2, the objective quality evaluation method of the uploaded video with a bit rate of 8M compressed by 720×576 MPEG2 main profile using the method of the present invention.
[0072] First, by parsing the uploaded video file, obtain the encoding format of the upload source video src_coding_type=MPEG2main profile, the encoding bitrate of the upload source video src_coding_bitrate=8828kpbs, and the resolution of the upload source video: src_resolution is 720x576.
[0073] Get the video peak signal-to-noise ratio psnr_1pass=40.438db after 1pass transcoding is completed.
[0074] According to the encoding format lookup table 1, obtain the bit rate loss_factor=0.2 corresponding to the upload source encoding format MPEG2.
[0075] Calculate the dynamic weighting factor of bitrate video (unit: kbps) br_mot_factor: set the value of psnr_mot_base of reference motion video peak signal-to-noise ratio to 37, set the upper limit of br_mot_factor to 4 and the lower limit to 2 / 3; use t...
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Abstract
The invention provides a video quality evaluation method. The video quality evaluation method comprises the steps: analyzing container information of an uploaded source video, obtaining encoding form, encoding rate and discernable ratio of the video, obtaining the peak signal to noise ratio of the video after 1pass transcoding is finished, searching a code rate loss rate table of the encoding form to obtain the corresponding code rate loss rate according to the obtained encoding form of an uploaded source, computing a dynamic weighting factor of the video, obtaining the converted code rate from video sources of various encoding forms and different contents according to a conversion equation, substituting the converted code rate and the discernable ratio of the uploaded source video into a video quality evaluation classification table, and obtaining video quality classification by searching. The video quality evaluation method can be fused with a universal video transcoding framework easily and conveniently, under the situation of using little additional calculation amount, the quality of the videos uploaded by users can be evaluated automatically and objectively without using original video information, and accordingly the videos uploaded by the users can be conveniently classified by video websites and preferentially recommended on the websites. The quality evaluation method and device for the uploaded videos of the websites have high application value.
Description
Technical field [0001] The invention relates to the field of video technology, and more specifically, to a method and device for evaluating the quality of videos uploaded by websites. Background technique [0002] At present, with the development of network communication technology, various video services continue to appear and are easily uploaded to websites for sharing. Therefore, accurate and real-time evaluation of video quality is very important for video processing, video communication and other fields. effect. [0003] Video quality evaluation is the subjective or objective evaluation of video quality. Evaluation methods can be divided into subjective evaluation and objective evaluation. [0004] Subjective evaluation is to observe a series of distorted videos and reference videos through a group of observers (15-30 persons), and then give a score (Mean Opinion Score, MOS) according to the visual effects of distorted video damage. Since people are the ultimate viewers, subje...
Claims
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Application Information
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