[MPlayer-users] Re: Problem with 2-pass encoding

[rbtq7ol02 at sneakemail.com]

On Tuesday 15 April 2003 21:49, mplayer-users-request-at-mplayerhq.hu 
|mplayer-list| wrote:
> Are you sure you're not launching *TWO* (or more) mencoders at the
> same time on pass 1 ? Or your compiler is completely fsck'ed up.
> The folowing lines are complete non-sens.
> (and yes, divx2pass.log is complete garbage)

Yes, quite certain, I pasted this straight out of my terminal.  I'm fairly 
certain I've found the problem now, I hadn't noticed the part of the output 
you mentioned before but it fits with what I suspect.  I captured the 
original at 480x480 from TV and used the lavc aspect ratio option to mark it 
as 4/3.  I then cut the commercials from it with avidemux, which has a "smart 
copy" feature.  In smart copy mode, frames between the end of a cut portion 
and the next keyframe are re-encoded, while the rest of the frames are 
copied.  I'm guessing that avidemux didn't know about the aspect ratio data, 
so any frames that smart copy re-encoded are 1:1, while the copied frames are 
4:3.  This would explain the messages you noticed, and problably everything 
else as well.  I'm cutting the files I have right now on keyframes, and 
removing the aspect ratio from the script that I use to record, which I think 
will probably fix things.  As for the last time this happened, perhaps my 
memory of the solution was simply faulty.