[MPlayer-users] 3pass mencoding creates shorter length video

[D Richard Felker III]

On Sun, Jan 12, 2003 at 09:32:37PM +0100, Arpi wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> 
> > mencoder -dvd 1 -oac copy -ovc lavc -lavcopts vpass=1:...
> > mencoder -dvd 1 -oac mp3lame -ovc lavc -lavcopts vpass=2:...
> 
> you shouldn't do this.
> if there are any broken bits in teh audio stream, or anyway, it's possible
> that different frames will be skipped/dupped in the 2 passes, causing 2-pass
> video messed up. you should use teh same audio codec for both passes (but
> may use faster options for pass1, like minimum algo quality and abr)

Bleh. Good point though. IMHO this is a very good reason why we should
add -oac null to mencoder (i.e. decode and process audio but throw the
result away). Mind if I add something like that?

Rich