Method and device for controlling video record and synchronized-controlling unit

A video recording and control method technology, applied in the multimedia field, can solve the problems of audio and video out of sync, low frame rate of actual video recording, etc., and achieve the effect of reducing out of sync
CN101076099BInactive Publication Date: 2010-06-09VIMICRO CORP
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
VIMICRO CORP
Publication Date
2010-06-09
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention is used for solving the issue that is the actual recorded frame rate is lower than the preset frame rate so as to generate asynchronization between audio and video signals, which is caused by dropping down of sensor frame rate or the interrupt processing delay of timer. The method comprise: the total frame amounts of video files and the accumulated recording time are recorded; when making each interrupt process, according to the preset interrupt frequency, the accumulated recording time at time of triggering the interrupt and the total frame amounts of images, determining the frame amounts of images that should be written into the video file; according to the frame amounts of images that should be written into the video file, getting the relevant frame image data and writingit into the video file, and the quitting the interrupt process.
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Description

technical field

[0001] The invention relates to video recording technology in the multimedia field, in particular to a video recording control method, device and synchronous control unit. Background technique

[0002] In the prior art, on embedded platforms, especially on some low-end platforms, recording with audio is performed separately, and the audio and video must be synchronously synthesized to present synchronous audio to viewers. video.

[0003] Audio video synchronization is also known as "lip synchronization". In the acquisition, compression, transmission, reception, decompression, and playback of audio and video, each link will introduce different degrees of delay to the passing audio and video signal, and the delay is usually not equal. The out-of-sync of the entire audio and video is the algebraic sum of the out-of-sync of each link in this chain. Due to the complexity of the codec algorithm, the video signal usually suffers a greater delay than the audio sig...

Claims

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