On Tue, 2010-10-26 at 16:20 +0200, Ján Kolár wrote: > When generating mpeg-ts stream using ffmpeg, I have observed, that PCR > marks are spaced too far apart one from another. Typical PCR period is > about 60 - 70 ms which is a way too much. Another problem is that this > value considerable varies at some moments. Especially on dynamic scenes > I have seen extraordinarily big PCR periods ranging to several hundreds > of milliseconds. Because of this I have disordered timing in output > module which sends created stream to network QAM modulator > (http://www.dektec.com/Products/IP/DTE-3114/). My output buffer can > accomodate max. 250 ms block of data. I have suspicion that this is a > ffmpeg bug, but not sure. Has this happened to someone? > > Jan
I posted a couple of patches related to PCR generation a few weeks ago. They have not been OK'd to commit yet though. Do try them out since feedback on them would be good. The following thread deals with PCR jitter and accuracy improvement: https://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2010-September/097856.html The latest version of that patch is at: http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2010-October/098479.html This thread deals with forcing PCR to be written more often, at the cost of some overhead. It is probably closer to what you want: https://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2010-October/098484.html /Tomas
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