[MPlayer-users] Cutting DVD video with the '-sb' and '-endpos' options

[belcampo]

Jonathan Busby wrote:
> RC wrote:
>> On Sun, 22 Mar 2009 13:53:12 -0500
>> Jonathan Busby <jonathanbusby at gmail.com> wrote:
>>
>>   
>>> Hello. I have been trying to find a way to cut, with single frame
>>> accuracy, an MPEG-2 PS stream from a DVD. 
>>>     
>> You can't get greater than GOP/Keyframe accuracy without reencoding at
>> least part of the video stream (which Avidemux does).  End of story.
>>   
> 
> Yes, I know. The beginning of the cut I know to be on an keyframe
> boundary, although the end is not.
> 
>> MEncoder does happen to have the -hr-edl-seek option, however, which
>> will do more or less what you want as you reencode the video.
>>
>>   
> 
> Thanks for the tip. :)
> 
> I've now used Mplayer with the '-edlout' option to generate a cut
> list and indeed the time values recorded by pressing 'i' are frame
> accurate, or so I thought. I used said cut list with the '-edl' and
> '-hr-edl-seek' and a modified encoding script to run a test encode
> using Mencoder. Unfortunately the part(s) of the source video
> that I marked to be encoded using Mplayer with '-edlout' , 'i' and
> '.' for frame-stepping do not correspond ( after editing the cut list
What
> so that eg. 'A B 0\n C D 0\n' is changed to '0 A 0\n B C 0\n D
> END_OF_FILE 0\n'
> ie. the start and end cut point pairs now correspond to to streams
> of video that are *exclusively saved* .
> ) to the part(s) encoded in the output video.
I don;t get what you are saying here
> 
> I've repeated the above only to get the same *exact* results -- the
> timestamps produced by pressing 'i' with the '-edlout' option using
> Mplayer do not correspond to *absolute* timestamps. That is,
> whenever there is a progressive<->interlaced transition in the
> source video that results in a frame rate change the video timestamps
> often get skewed eg. either by being reset, or jumping backwards.
> 
> So, unless I'm missing something really obvious, it seems that the
> utility of using Mplayer as a cutting tool for non-progressive video
> is nil.
EDL was intented to get 'rough' material in video-editing suites to be 
worked/cut further then.
> 
> I really don't know what to do now.
> 
> 
> Jonathan
> 
> 
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