Video transcoding method and device, server and storage medium

Abstract

The embodiment of the invention discloses a video transcoding method and device, a server and a storage medium. The method comprises the following steps: according to picture coding characteristics ofa video to be transcoded, determining a transcoding factor selected by the video to be transcoded when the video to be transcoded reaches a subjective quality index specified by a gear to be transcoded after being transcoded at different gears to be transcoded; and transcoding the to-be-transcoded video by adopting different to-be-transcoded rate gears and the corresponding transcoding factors. The embodiment of the invention provides a technical scheme. Setting the same subjective quality index for the video to be transcoded under the same code rate gear; the effect of transcoding the videoto be transcoded according to the predicted transcoding factor is compared with a specified subjective quality index; the accuracy of the transcoding factors selected under different code rate gears is guaranteed, then the different to-be-transcoded rate gears and the corresponding transcoding factors are adopted to carry out multi-code-rate transcoding on the to-be-transcoded video, reasonable distribution of code rates is achieved, and therefore unnecessary code rate waste is avoided.

Description

technical field [0001] The embodiments of the present invention relate to the field of video processing, and in particular, to a video transcoding method, device, server and storage medium. Background technique [0002] In a video transcoding system, in order to adapt to the network bandwidth of different terminals at different times and the corresponding terminal processing capabilities, etc., it is often necessary to follow different bit rate gears and preset constant bit rate factors ( Constant rate factor, CRF) performs multi-bit rate transcoding on the received source video stream. This CRF can make the source video stream achieve the corresponding video playback quality after transcoding at this bit rate gear, so that it can be sent to different terminals in the future. Distribute video streams under the adaptive bit rate gear. [0003] At this time, when the corresponding preset CRF is used for transcoding under different bit rate gears, the playback quality of the v...

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Problems solved by technology

[0003] At this time, when the corresponding preset CRF is used for transcoding under different bit rate gears, the playback quality of the video is mainly the objective playback quality of the video, and due to the contrast sensitivity of the human eye to the video, brightness nonlinearity, and frequency sensitivity Due to influences such as gender and masking effects, users will have large differences in the subjective playback quality of video streams with different content transcoded at the same bit rate. For example, users are more sensitive to the distortion of video images under slow motion than It is too easy to detect the distortion of the video image under violent motion. Therefore, for any video, the corresponding preset fixed CRF is used for multi-bit rate transcoding under different bit rate gears, and it is impossible to measure the subjective playback quality of each video for users to watch.

[0004] At present, firstly, the content of the source video stream is perceptually analyzed to determine the video category to which the source video stream belongs, such as movies, sports or animation, etc., and then adapt to the CRF set in advance for different bit rate gears under the video category For multi-bit-rate transcoding, at this time, by setting corresponding CRFs under different video categories, the corresponding CRFs can be selected according to different user bandwidths to deliver videos, but it is impossible to accurately measure the user's video streams of different content under the same video category The subjective playback quality of

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