[MEncoder-users] Mencoder failure with -ss and -endpos

[Pete Davis]

> >
> > Hi,
> > On Tue, Jul 19, 2005 at 04:42:38PM -0500, Pete Davis wrote:
> > > This worked for a 43 second block, but for a 90 second block, the
> second
> > > pass fails:
> > [...]
> > > It stops at 80.8 seconds into the second pass with:
> > >
> > > Pos:  80.8s   1956f (23%)  27fps Trem:   3min  49mb  A-V:0.037
> > [1105:128]
> > > 1 duplicate frame(s)!
> > > mencoder: ratecontrol.c:644: ff_rate_estimate_qscale: Assertion
> > > `picture_number<rcc->num_entries' failed.
> >
> > This means that the firstpass log contains only data for 80 seconds. You
> > have "duplicate frame" messages there, maybe you need to use -vf
> > harddup?
> > Or -mc 0 -noskip? or the right framerate for output with -ofps. Or some
> > inverse telecince (sorry, don't remember what your input format was).
> >
> > Greetings,
> > Reimar Döffinger
> >
> 
> I got the latest build and it's not crashing anymore. The input source is
> a
> DVD with mixed progressive and telecine, so as per 7.14.3.4 of the docs,
> I'm
> using -vf pullup,softskip and -ofps 24000/1001
> 
> I still get quite a few duplicate frames and skipped frames, as well as
> messages that: 30000/1001fps NTSC content detected and 24000/1001fps
> progressive NTSC content detected along the way. Is this normal?
> 
> If I encode the entire episode, then go into Windows Media Player and get
> a
> period I want to record and use that in -ss and -endpos, it doesn't line
> up
> at all. For example, if the period is 00:07:38-00:8:08 when viewing it and
> I
> use that for -ss -endpos, it really encodes a section more than minute
> earlier. What would be causing this?
> 
> Pete
> 
> 

It seems I spoke too soon. Continuing to cut clips, and the error is still
appearing occasionally, just for different clips than the older version.

Again, from my original post, the full set of parameters I'm using are:

First pass:

mencoder -dvd-device ./ dvd://3 -ss 00:08:00 -endpos 90 -oac copy -o
/dev/null -vf pullup,softskip,scale=512:288 -ovc lavc -lavcopts
vcodec=mpeg4:vbitrate=1100:trell:mbd=2:keyint=30:vpass=1:turbo -ofps
24000/1001 -ffourcc DIVX

Second pass:

mencoder -dvd-device ./ dvd://3 -ss 00:08:00 -endpos 90 -oac mp3lame
-lameopts cbr:br=128 -o movie.avi  -vf pullup,softskip,scale=512:288 -ovc
lavc -lavcopts vcodec=mpeg4:vbitrate=1100:trell:mbd=2:keyint=30:vpass=2
-ofps 24000/1001 -ffourcc DIVX

Pete