[FFmpeg-devel] Timestamp issues in live RTP->mpegts bridges

Alexandre FERRIEUX - FT/RD/SIRP/ASF/SOFTL alexandre.ferrieux
Tue Jan 20 16:08:20 CET 2009

Luca Abeni wrote:
> This looks like something for the codecs guys: can you open an issue on
> the bugtracker, or send an email in a new thread describing this problem?
> (you will have to upload the H.263 bitstream on upload.ffmpeg.org, as
> indicated in the bugreport page).

What I don't understand is that independently from the codec, looking at 
the RTP timestamps, they are  incremented by 6036 or 5946 per frame, 
which is roughly 15fps for a clock of 90kHz. But maybe this information 
is not exploited ?

>> Also, I was wondering: instead of giving a fixed frame rate, is there a 
>> way of just inheriting the input timestamps ?
> I think what you want here is variable frame-rate... I do not know if
> H.263 supports it. If yes, in theory you should not need any additional
> command line option (but I am not sure, as I have no experience with
> variable frame-rate).
> Anyway, I think you are now hitting a codec-related bug...

OK, I'm learning, I just wanted to know at a high level which info is 
handled by what. Maybe I'm expecting too much about the internal use of 
RTP timestamps...


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