[MEncoder-users] -ss and -endpos cutting creates very visible h264 artifacts

[Marc MERLIN]

On Sun, Feb 28, 2010 at 08:30:20AM +0100, Reimar Döffinger wrote:
> On Sat, Feb 27, 2010 at 11:23:16PM -0800, Marc MERLIN wrote:
> > > Copying the video completely into a different format forst, e.g. mkv, with ffmpeg or mkvmerge
> > > or so might fix it...
> > 
> > Yes, if I re-encode it will likely work. It just takes a long time to
> > re-encode and loses quality :)
> 
> Not re-encoding (mkvmerge can't even do encoding AFAIK), just copying it.
> It won't allow you to cut more precisely, but at least there should be
> no artefacts.

Thanks. It was worth a shot.

I tried this:
mkvmerge -o out.mkv 491_Keystone2_treerun_fall.avi 
mencoder -ss 0:1:20 -endpos 0:0:30 -oac copy -ovc copy out.mkv -o out2.mkv 

And it's the same problem, out2.mkv still seems to be missing a keyframe and
the video only looks ok after about 10 seconds.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems & security ....
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Home page: http://marc.merlins.org/