[MEncoder-users] Wrongly guessed bitrates for 2x700 MB CDs

[Dominik 'Rathann' Mierzejewski]

On Thursday, 21 September 2006 at 09:44, Niki Kovacs wrote:
> Hi,
> 
> I just successfully encoded a DVD using this set of commands:
> 
> $ mencoder -dvd-device HIGH_FIDELITY/ dvd://1 -aid 128 -sid 2 -oac 
> mp3lame -lameopts mode=2:cbr:br=96:vol=0 -ovc frameno -o frameno.avi
> 
> ... which gave:
> 
> Writing index...
> Writing header...
> ODML: Aspect information not (yet?) available or unspecified, not 
> writing vprp header.
> Recommended video bitrate for 650MB CD: 723
> Recommended video bitrate for 700MB CD: 787
> Recommended video bitrate for 800MB CD: 916
> Recommended video bitrate for 2 x 650MB CD: 1557
> Recommended video bitrate for 2 x 700MB CD: 1685
> Recommended video bitrate for 2 x 800MB CD: 1942
> 
> 
> I wanted to have the resulting .avi to fit on two 700 MB CDs, so I chose 
> 1685 for bitrate:
> 
> Video pass 1:
> 
> $ mencoder -dvd-device HIGH_FIDELITY/ dvd://1 -aid 128 -sid 2 -vf 
> crop=688:528:16:20 -oac copy -o /dev/null -ovc lavc -lavcopts 
> vcodec=mpeg4:vbitrate=1685:vhq:autoaspect:vpass=1
> 
> ... and then:
> 
> $ mencoder -dvd-device HIGH_FIDELITY/ dvd://1 -aid 128 -sid 2 -vf 
> crop=688:528:16:20 -oac copy -o High_Fidelity.avi -ovc lavc -lavcopts 
> vcodec=mpeg4:vbitrate=1685:vhq:autoaspect:vpass=2
> 
> The resulting .avi is of very satisfying quality... only it is almost 
> 1.7 MB big... which is much too large to fit on two CDs.
> 
> Q: how can I guess correct bitrates?

You did get correct bitrate for mp3 audio, but you used an old deprecated
method (-ovc frameno) which AFAIK doesn't work anymore, so you got the AC3
audio from DVD instead in the final encode. Well, that's my guess without
seeing the output of mencoder.

Regards,
R.

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