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

[belcampo]

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.
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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.