Patent ID: 8509301
Filing Date: 2013-08-13
Classification: H04N

Abstract:
1. An audio and video synchronizing method in a transcoding system comprising: receiving data including encoded audio frames and encoded video frames; de-multiplexing the data to obtain audio frames and video frames; decoding the audio frames and the video frames; detecting lossy frames of the decoded audio frames and the decoded video frames by using audio time stamp information included in the decoded audio frames and video time stamp information included in the decoded video frames; compensating for the lossy frames by comparing relative times of the lossy audio frames and the lossy video frames; encoding the compensated audio frames and the compensated video frames; and multiplexing the encoded audio frames and the encoded video frames, wherein the compensating for the lossy frames comprises: if the lossy audio frames are greater than the lossy video frames, inserting as many mutes as lengths of the video frames corresponding to the lossy audio frames into the lossy audio frames, if the lossy video frames are greater than the lossy audio frames, calculating a number of the video frames corresponding to lengths of the lossy audio frames; and duplicating as many video frames right before a loss occurs as the calculated number of the video frames to compensate for the lossy video frames.