[MEncoder-users] Accuracy of the -endpos option

[belcampo]

Josef Wolf wrote:
> Hello,
> 
> I have troubles with the accuracy of the -endpos option. Most of the time,
> I get about 40 to 50 frames too much. When I adjust the value to get the
> correct end position, then audio ends about 2 seconds too early.
With ffmpeg -vframes ### you can exactly say how many frames you want.
The problem with -endpos or -t when using ffmpeg, it uses recording 
duration, NOT video- or audio-duration but the smallest of them.
> 
> The problem doesn't seem to be dependant on the source material or the
> codec. I had the problem with ljpeg and DV source (which should both be
> searchable on a frame-by-frame bassis). Using lavc instead of x264 don'
> help either. 
Is DV source all-keyframes ??
> 
> Any ideas what could cause this effect?
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