- On Aug 16, 2013 7:30 PM, "Nisar Ahmed" <[email protected]> wrote: > > I am muxing h264/aac stream to mp4 coming from an encoder and having issues syncing audio and video streams. > > I suspect that the problem is with PTS and DTS but I am not sure what values should i set to properly sync both streams. > > I have set the time_base of video stream's AVCodecContext to 1001/30000 and each AVPacket gets a duration of 1001 > > I am recieving time stamps from the encoder with each NAL packet which is set as PTS of the AVPacket. the sequence of PTS/DTS I set is (2002/0, 0/1001, 1001/2002, 5005/3003, 3003/4004...) > > Audio stream AVCodecContext sample rate is 48000 and PTS/DTS are simply multiples of 1024 starting from 0 and AVPacket duration is 1024. > > The output movie 's frame rate is 20fps when it should be 29.97fps as it is ntsc. > > Please tell me how to debug this problem and what are the guidelines of creating pts/dts for both video and audio in my case > > _______________________________________________ > Libav-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/libav-user > Hi naseer
If you are getting timestamp with encoder, i would suggest "dont try to manuplate that" you may set that same timestamp as presentation timestamp (pts) if your video is realtime then try not to generate B type video frame hence no need to set dts. Whatever clock is set by encoder try generating the pts of audio according to that. @enjoy Anshul
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