>      mencoder -audiofile out.mp3 -oac copy ...
>
>  just prepare the .mp3 or whatever ahead of time and use that.

OK. That appears to mean the lav2wav-to-mp3 stage is still required, which is 
what I thought. I still have it in my script.

>  As an experiment you might try doing a one pass encoding to compare
>  against the results of a 2 pass.  It might be possible you don't
>  see much, if any, difference and can thus save a lot of time.

Yes, I've been through that test and your implication is correct - that second 
video pass achieves no visible change (to the video or filesize) at the low 
bit rate setting I'm using. I also found a lot of tips in the mplayer docs 
and archives which detail various tweaks which they claim give better quality 
output. I've tried them all and they all just add to the encoding time! I 
guess at higher bit rates and file sizes they will add something under some 
circumstances, but I'm back to where I started 3 days ago: capture with -d2, 
then use mencoder to pass the audio, then again to do one pass of the video. 
I guess sometimes life just isn't as complicated as we think it should 
be... :o)


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