[solved] Video conversion problem: Mencoder on Arch versus Windows XP

I have a cheap portable video player which (according to a supplied Windows software configuration file) requires any video to be converted (say from a YouTube .flv) using a command line like:
mencoder myfile.flv -ofps 15 -vf-add scale=160:128 -vf-add expand=160:128:-1:-1:1 -srate 44100 -ovc xvid -stereo 0 -xvidencopts bitrate=300:max_bframes=0:quant_type=h263:me_quality=0 -oac lavc -lavcopts acodec=mp2:abitrate=128 -o myfile.avi
If I do the conversion on Linux - my fully-upgraded Arch - the resulting .avi file has the audio and video out of sync when played with Mplayer (on Linux and Windows), and no audio at all when played with Vlc (on Linux and Windows). But if I do (supposedly) exactly the same conversion using Mencoder on Windows, the resulting .avi file plays perfectly on everything on both Linux and Windows (and also the portable video player).
Here's the version information for the Mencoders being used:
Windows: MEncoder Sherpya-MinGW-20060312-4.1.0 (C) 2000-2006 MPlayer Team
Arch: MEncoder SVN-r32492-4.5.1 (C) 2000-2010 MPlayer Team
I'd be grateful for any ideas as to how to make my Mencoder conversion work as well on Linux as it does on Windows XP! (Or is there something wrong with the way I'm playing the file with Mplayer and Vlc on Arch?!)
Last edited by ninian (2010-11-16 23:28:02)

Aha! I think I've cracked it, but using ffmpeg instead, with options prompted by this blog post:
ffmpeg -i infile.flv -r 15 -vcodec mpeg4 -vtag XVID -s 160x128 -aspect 4:3 -qmin 3 -qmax 5 -ar 44100 -ab 128k -ac 2 -acodec mp2 -g 1 outfile.avi
This seems to work everywhere, and the writer specially notes that:
The most important option is the -g 1 to force every frame to be a keyframe
which may well be where my conversions were going wrong. So I'll mark this as 'solved' even though mencoder is still a mystery, but I have learned to keep Vlc up my sleeve, so thanks for that tip again.

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Quote
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