[MEncoder-users] accuracy of -ss -endpos function

[belcampo]

Phil Ehrens wrote:
> belcampo wrote:
>> Phil Ehrens wrote:
>>> belcampo wrote:
>>>> Hi all,
>>>>
>>>> I'm using the -ss -endpos function but results in a/v sync problem, the 
>>>> v-part got bigger after putting the parts together.
>>>>
>>>> What I did
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o destination.h264
>>>>
>>>> results in Duration 00:28:56.960
>>>>
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o part0.h264 -endpos 350
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o part1.h264 -ss 350 endpos 350
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o part2.h264 -ss 700 endpos 350
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o part3.h264 -ss 1050 endpos 350
>>>> mencoder sourcefile -nosound -noskip -mc 0 -ovc x264  -x264encopts ..... 
>>>> -of rawvideo -o part4.h264 -ss 1400 endpos 350
>>>> cat part0.h264 part1.h264 part2.h264 part3.h264 part4.h264 > part01234.h264
>>>> results in Duration 00:29:07.520
>>>>
>>>> Every cut added (67.52 - 56.96) / 5 = > 2 sec.
>>> Right. Cuts can only be made at keyframes.
>>> You might want to take a look at avidemux if
>>> you are going to be doing a lot of editing.
>> That's "not" an option for me, unless I could 'say' in a script cut from 
>> 0 - 700 sec. at next I-frame. Next section go to pos. 700, skip to next 
>> I-frame forward to pos 1400 and skip to next I-frame. That would do the job.
> 
> Avidemux DOES have a cli... But I haven't tried it.
> Since it IS designed to be an editor, I would think
> it would be usable. Good luck!
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In Avidemux is saw that keyframe distance in PAL-DVB = .48 sec. When 
choosing ss and endpos as multiples of that I think I will be where I 
want to be.
Thank for your hint.