Method and system for achieving audio and video synchronous speed variation

An audio and video synchronization, audio and video technology, applied in the direction of image communication, selective content distribution, electrical components, etc., can solve the problems of poor observability of audio and video files, the inability of high-quality audio to change speed, etc., to ensure playback quality, improve user The effect of experience

Active Publication Date: 2015-12-30
FUZHOU ROCKCHIP SEMICON
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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 th

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  • Method and system for achieving audio and video synchronous speed variation
  • Method and system for achieving audio and video synchronous speed variation
  • Method and system for achieving audio and video synchronous speed variation

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[0028] The following describes the implementation of the present invention through specific specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.

[0029] It should be noted that the illustrations provided in the following embodiments only illustrate the basic idea of ​​the present invention in a schematic manner. The figures only show the components related to the present invention instead of the number, shape, and number of components in actual i...

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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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Application Information

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IPC IPC(8): H04N21/43H04N21/8547
CPCH04N21/4307H04N21/8547
Inventor 孙铭骏洪涛
Owner FUZHOU ROCKCHIP SEMICON
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