[FFmpeg-user] Timing control?

Spencer Graves 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 
> frames?
>       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 
> problem.
>       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." 
> (http://ffmpeg.org/ffmpeg.html)

       I just submitted FFmpeg bug Ticket #3484 with the toy example 
previously described.

       Thanks to all who have taken (and will take) the time to think 
about this problem.

>       Suggestions?
>       Thanks,
>       Spencer
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user

More information about the ffmpeg-user mailing list