[FFmpeg-user] Timing control?
spencer.graves at prodsyse.com
Thu Mar 20 21:49:06 CET 2014
On 3/20/2014 12:29 PM, Spencer Graves wrote:
> What's the preferred method for controlling the timing of individual
> This list previously recommended the concat demuxer with a
> control file (thread "[FFmpeg-user] concatenate png files for
> different durations?"). Unfortunately, that failed to control the
> timing as advertised: A toy example played "duration 6" in less than
> 1 second followed by 5 seconds for a frame at "duration 1". (I want to
> mate frames with audio timed to hundreths of a second.) I've not been
> able to control the times even if all frames have officially the same
> time. Other posts suggest that I'm not the only person with this
> It looks to me like there is a bug in the FFmpeg concat
> demuxer. However, another question asked about keyframes. Researching
> that led me to documentation saying that, "forcing too many keyframes
> is very harmful for the lookahead algorithms of certain encoders:
> using fixed-GOP options or similar would be more efficient."
I just submitted FFmpeg bug Ticket #3484 with the toy example
Thanks to all who have taken (and will take) the time to think
about this problem.
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