[MPlayer-users] Re: Low bitrate using 2-pass with libavcodec

[Rémi Guyomarch]

On Sun, Apr 21, 2002 at 06:21:44PM +0200, marcogi at libero.it wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Sun, 21 Apr 2002, Rémi Guyomarch wrote:
> 
> > > But, when I try to do thirth pass mencoder drops video bitrate to about one
> > > half I set. The bitrate seems stable around 780 for the first frames; after
> > > about 300 frames bitrate drops quikly to 370. The obtained video quality
> > > is visibly lower then first pass one.
> > 
> > Don't use vhq on the first pass. The second pass will still be encoded
> > with a lower bitrate than the first, but the difference will be
> > minimal (less than 10%). Adjust the bitrate accordingly. For example,
> > on a 10 minutes sample I specified vbitrate=858 and got 797 on the
> > second pass. The ratio may depend on what you encode.
> 
> I did so, but still second pass video has lower quality than first pass.

Make sure you deleted frameno.avi before -pass 1.

-- 
Rémi