Convert MKV to XviD

[lazaruz]

I'm trying to convert MVK-files to XviD but it doesn't work like I want it on all files.
I'm encoding 2 pass and copying the AC3 audio.

I'm using these command lines:

mencoder input.mkv -aid 0 -ovc xvid -oac copy -msglevel all=-1:statusline=5 -really-quiet -xvidencopts pass=1:chroma_opt:quant_type=mpeg:me_quality=5:max_bframes=0:turbo -sws 9 -vf softskip,harddup,pullup,hqdn3d,scale=720:406 -passlogfile video.log -o output.avi

mencoder input.mkv -aid 0 -ovc xvid -oac copy -msglevel all=-1:statusline=5 -really-quiet -xvidencopts pass=2:bitrate=1827:chroma_opt:quant_type=mpeg:me_quality=5:max_bframes=0 -sws 9 -vf softskip,harddup,pullup,hqdn3d,scale=720:406 -passlogfile video.log -o output.avi

The bitrate and scale is of course different on each file...

The problem I'm having is that I'm converting ~43 minutes of video to a standard 1 CD file, ~733 000 000 bytes and it works on most files but not all.
Sometimes the final file is larger and sometimes it's smaller...

Does anyone have any idea why this is?

[45tripp]

first,
obviously it's a bad idea to disable message logging when troubleshooting.

Sometimes the final file is larger and sometimes it's smaller...

don;t think i've ever heard of overshoot with xvid...
undershoots yes.

but,
some xvid revisions have been notoriously bad with
hitting bitrate targets.
and if you're increasing the bitrate a lot, you could get
to saturation point, so it'll be under.
and i've seen report of (and experienced) xvid within
mencoder undershooting set bitrate by ~x1.25.

i suppose you could try compiling your own with a diff xvid revision.
or trying to pinpoint specific parameters that trigger the behaviour.
or, use lavc mpeg4. I do.

interesting filter chain.
what's it's purpose?


tripp