[MPlayer-users] mencoder/mplayer kbit question

[D Richard Felker III]

On Sat, Jan 25, 2003 at 06:57:16PM +0200, Mihai RUSU wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Sat, 25 Jan 2003, Vladimir Mosgalin wrote:
> 
> > MR>Video stream:  929.329 kbit/s  (116166 bps)  size: 636066659 bytes
> > MR>5475.494 secs  131287 frames
> > MR>
> > MR>But 116166 / 929.329 =~ 124
> >
> > Hmm ;) 929.329*1000/8=116166 (*1000 kbit/s->bit/s conversion - note it
> > isn't 1024 due to obvious reasons, and /8 is bit->byte conversion)
> >
> 
> Thanks for all the answers (it was stupid of be to think bps is bits per
> second).
> 
> Now on the second problem I did some more tests. It happens too with the
> lavc codec. So using xvid or lavc if I specify bitrate of 1000 (which from
> the docs means kBit/s) with 2 pass encoding it encodes it with ~800 kbit
> (~ 100000 bps). Now for example when encoding in 3 steps, I take the
> bitrate hint from the end of frameno pass and I multiply it with 1.25 and
> use that value for the codec. It seems a constant raport with my tests, am
> I again wrong here ? :)

Yes. Are you encoding from NTSC movie DVDs? If so you NEED -ofps
23.976. Search the archives for full explanations. In any case, if you
want help, you need to explain what you're doing. We can't read your
mind and obviously the bitrates do right for us.

Rich