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.