[MEncoder-users] Extracting video parts using mencoder

[Epithemeus]

Thank you! It works now. The ffmpeg option was the most convenient.

ffmpeg has an option of -sameq (for quality of the split video). This
implies VBR, and hence a larger size than what it 'should' be (for instance,
when the -sameq is not used). If -sameq is not used, the size of the split
video seems about right but the quality isn't the same. Is there a way to
keep the quality of the split video the same and not increasing the size so
significantly? Any ideas for this?




Epithemeus



> -----Original Message-----
> From: belcampo [mailto:belcampo at zonnet.nl]
> Sent: Wednesday, April 08, 2009 3:45 PM
> To: MEncoder usage discussions; epithemeus.afterthought at googlemail.com
> Subject: Re: [MEncoder-users] Extracting video parts using mencoder
> 
> Epithemeus wrote:
> > Yes, certainly seems like seeking within MPG files is imprecise!
> Trial and error is an option but to do this for several videos may
> prove to be time-consuming. Unfortunately, I wasn't able to find much
> about using EDL and -hr-edl-seek. Anyone with the experience of having
> used this?
> >
> > Alternatively, is there an easy alternative to splitting/extracting
> parts of videos? Please note that I can use time or size of the split
> files as bounding conditions to extract the video parts.
> >
> >
> ffmpeg seeks accurate.
> ffmpeg -ss 600.0 -t 600.0 source.mpg -acodec copy -vcodec copy -f mpeg
> result.mpg
> 
> alternative
> 
> ffmpeg -ss 600.0 -vframes 15000 source.mpg -acodec copy -vcodec copy -f
> mpeg result.mpg
> 
> As well as mplayer is able to create a edl file
> 
> start mplayer -edlout source.edl source.mpg
> 
> pause by pressing "." the dot, you can step frame by frame by pressing
> "." again. Press "i" where you want your cut to start.
> Press "space" or "p" to start playing again.
> Press "." near the point where you want your end-point. Step, by
> pressing "." to the exact point. Press another "i"
> 
> Now you've created source.edl which looks like
> 
> 9552.735352 9612.935273 0
> 
> the difference in this case is 60sec.
> 
> This is a 'skip-list' the opposite of what you want.
> 
> So we edit the file to:
> 
> 0.000000 9552.735352 0
> 9612.935273 9999999.000000 0
> 
> mencoder -edl source.edl -hr-edl-seek source.mpg -oac copy -ovc copy -o
> 60secs.avi
> 
> Last number higher then end of file. Ctrl-C aborts but leaves the file
> OK.