On Wed, 29 Dec 2004, Doug Larrick wrote: ]Daniel Thor Kristjansson wrote: ]> Most of audio information with ATSC is not in the stream that ffmpeg sees. ]> Even the limited audio descriptor sometimes present in the PMT is jettisoned ]> with the PMT rewriting. I don't think ffmpeg even tries to look at this ]> information, but we don't save it in the recording to begin with. ] ]Yes, that's true, though if needed we could preserve the audio information from ]PMT while rewriting. The good news is that it *is* still present in the AC3 ]stream itself. The only use for preserving this data in PMT would be for ]non-AC3 streams (from DVB maybe?)
DVB, I believe, always includes this info in the PMT. In ATSC it is optional. -- Daniel
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