Hello Ibrahim, > I do have another issue with Audio sync when segmenting live content coming > from satellite but without encoding (stream copying only). And since you > cannot use aresample when copying I am unsure how you would go about to > solve that issue.
I can make a few general suggestions, and some observations you may not have considered. Handling stream errors can be hard to do properly, and over the years I've seen a host of cases on both the encoder and the decoding side where it didn't do the right thing resulting in A/V sync issues (and ffmpeg is certainly no exception). You may be well served to simultaneously write out a copy of the original TS to disk prior to transcoding. This will allow you to debug cases where A/V sync was lost and reproduce the issue. Also, it's much easier to be able to hand a sample to the developers and say "Try this 100MB sample and you can see for yourself" as opposed to not being able to provide any detail as to specifically what the source of the A/V sync issue was. Also, bear in mind that the issue could be on the transcoding or the resulting decoder you are using to view the stream, and restarting the transcoder may cause the issue to "go away" in the decoder just because the stream is reset. When dealing with A/V sync issues I commonly find two classes of issues: 1. There was a transient glitch and there was a gap in the resulting stream but after the glitch timing was correct. 2. There was a transient glitch and the timing in the resulting stream was off from that point forward. For #1 I've definitely seen cases where popular decoders would hit the glitch and fall out off sync and then never recover (I reported a couple of such issues when VLC 3.0 was released). Even worse, you can be mislead and blame the encoder because the problem went away after being restarted, when in fact the issue would have also disappeared if you had simply restarted the decoder. My best suggestion would be to come up with a couple of concrete examples, including the sample TS and the ffmpeg transcode command line, which are 100% reproducible and can be used to debug the issue. It's much more likely you'll get a fix if the developer can "make this stream play properly" versus "fix every possible cause of A/V sync issues that we can't readily reproduce and don't even know exist". Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel