Method and system for achieving audio and video synchronous speed variation

Abstract

The invention provides a method and system for achieving audio and video synchronous speed variation. The method comprises the steps that audio frequency with speed to be varied in a first audio cache region is read, and audio parameters of the audio frequency with the speed to be varied are extracted; a speed variation coefficient is obtained, and the audio quality of the audio frequency of which the speed to be varied is varied according to the speed variation coefficient is evaluated; when the audio quality does not reach a reserved requirement standard, exception processing is conducted on the audio frequency with the speed to be varied; when the audio quality reaches the reserved requirement standard, processing with speed variation and without tone variation is conducted on the audio frequency with the speed to be varied according to the speed variation coefficient, and then synchronization is conducted on corresponding video which is subjected to speed variation according to the speed variation coefficient. By means of the method and system for achieving the audio and video synchronous speed variation, audio and video synchronous speed variation can be achieved when an audio and video file is played in a speed variation mode, tone and timbre of the audio frequency can be kept invariant, and the playing quality of the audio and video file which is subjected to speed variation is guaranteed.

Description

technical field [0001] The invention relates to the field of media variable speed playback, in particular to a method and system for synchronously variable speed of audio and video. Background technique [0002] In many applications, the playback rate of audio and video files needs to be adjusted to slow playback at 0.5X, 0.6X, 0.8X, etc., or fast playback at 1.2X, 1.5X, 2.0X, etc. speed. After an audio and video file is demultiplexed, information files such as audio, video, or subtitles can be separated. When audio and video files are played at variable speeds, due to the particularity of the audio, simple interpolation and sampling operations cannot be performed on the audio, otherwise it will directly cause sound distortion. [0003] At present, common audio processing methods include: no audio processing, audio frequency conversion processing, or processing audio as an exception. The first two methods will cause the audio to be out of tune, and the latter processing me...

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method and system for synchronously changing audio and video speeds, which is used to solve the problem that the audio cannot be changed in high quality when the audio and video files are played at variable speeds in the prior art. The problem of poor observability of audio and video files after speed change

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