[FFmpeg-devel] H264 encoding and RTP muxing - calculating pts and dts

[Reimar Döffinger]

On Tue, Jul 20, 2010 at 03:33:02PM +0200, Vladimir Pantelic wrote:
> Alexandre Ferrieux wrote:
> 
> >Side question: what is the behavior of ffmpeg when such a VFR input (assuming the grabbing rate is somehow irregular) is
> >converted to a CFR container and codec like TS/mpeg2 ?
> >
> >Suppose an input timeline with frames F1...Fn. Dots indicate time:
> >
> >    F1.....F2....................F3....F4................F5
> >
> >and a regular output timeline for mpeg2ts:
> >
> >    G1.......G2.......G3.......G4.......G5.......G6.......G7
> >
> >What is G4:
> >
> >     - F2 (latest) ?
> >     - F3 (closest, non-causal) ?
> >     - F4 (one-to-one) ?
> 
> F4

Never looked at the code, but are you sure?
After all the -async etc. options must be there for some purpose,
if your answer is correct I can't see what purpose they'd have...
Ah, I realize that you are probably talking about using libavcodec/
libavformat directly, then that's probably true, but not for ffmpeg
as in the command-line program...