[MPlayer-users] mencoder: increasing bitrate doesnt increasequality or filesize...why?

[Pablo Morales]

I'm experiencing the same behavior, but I asume that something on my system
went wrong, things were working fine, till a couple of weeks ago , no
matters what I use, vqcale=2, or vbitrate=2000, 1500, 30000, I always end up
with a file o about 700 MB of less with a vbitrate that start at about 30
reaches 1000, then  goes down to 300, 250, 600, 900 and stays there.
I just was instlling some libs, libfame, xvid and other stuff, I recompiled
mplayer serveral time, removes things with configure, but no way..

I'll reinstall the whole OS and I'll try again

C ya..

----- Original Message ----- 
From: "Farrell Farahbod" <upgrdman at mindspring.com>
To: <mplayer-users at mplayerhq.hu>
Sent: Saturday, February 28, 2004 6:30 AM
Subject: [MPlayer-users] mencoder: increasing bitrate doesnt increasequality
or filesize...why?


> im compressing a file, with the following command:
>
> mencoder file.vob -aid 128 -ovc lavc -lavcopts vcodec=mpeg4:
> vbitrate=2000:vhq:v4mv:qpel:vpass=1 -oac mp3lame -lameopts abr:br=96 -
> vop scale=640:352 -sws 2 -o file-compressed-1.avi -ofps 23.976 &&
> mencoder file.vob -aid 128 -ovc lavc -lavcopts vcodec=mpeg4:
> vbitrate=2000:vhq:v4mv:qpel:vpass=2 -oac mp3lame -lameopts abr:br=96 -
> vop scale=640:352 -sws 2 -o file-compressed-2.avi -ofps 23.976
>
> and it results in a ~1.2GB file... which is ok... but i have budgeted
> 1.4GB for it...and well, i might as well eek out the most i can, to get
> the best possible movie. i tried increasing the bitrate to even 3000,
> with no increased quality or file size...why? does it have to do with
> the line at the end of the compression that reports something to the
> effect of "video bitrate: 1497" (i dont recall the exact wording,
> sorry).
>
> does mencoder max out at a 1497 or so bitrate??
> or is it codec related?
> in either case, why?
>
> i know there has to be a way to increase the quality... is increasing
> the number of keyframe with "keyint=xyz" my only option?
>
> lastly, is lavc/mpeg4 the best codec solution for compressing dvd-rips?
> is divx/xvid better? (iirc, theyre just hacked versions of mpeg4,
> right??) ... time is not much of a problem, so even if a different codec
> takes longer to compress, i don't mind.
>
> thanks,
>
> --farrell "upgrdman" farahbod
>
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