[MPlayer-users] Re: file size falls short of 700MB for multi pass

[Jonathan Rogers]

Jason Pepas wrote:
> I used 3 pass encoding on a file, and specified the suggested bitrate for a 
> 700MB cd given after the first pass.  However, the final filesize was only 
> 580MB.
> 
> what exactly does this mean?  that using more bits in this specific instance 
> would not improve quality?

No, it almost certainly doesn't mean that more bits wouldn't improve 
quality. Libavcodec's rate control is far from perfect. For most movies, 
it gets pretty close, but on some, it uses way too few bits. So far, the 
only way I've been able to fix it is to reencode, specifying a higher 
bitrate.

Jonathan Rogers