[MPlayer-users] Re: encoding quality - bpp, resolution, quants and quality

Tuukka Toivonen tuukkat at ee.oulu.fi
Tue Sep 9 15:33:01 CEST 2003

On Tue, 9 Sep 2003, HR wrote:

>Now, at 33% (53959 frames) with requested bpp=0.171, all quants are

Just a comment: I've recently experimented encoding PAL video (768x576 at
25 fps scaled down to 352x288, 640x480, or not at all) and with 1.2 Mbit/s
(0.109-0.156) it was totally unacceptable quality to me (except when
scaling down to 352x288, but that's somewhat low resolution). So now I'm
scaling to 640x480 and coding at 2 Mbit/s (0.26 bpp). Even with this
bitrate 640x480 appears to be better than unscaled size.

Much over 2 Mbit/s might not be possible, since it hits AVI 2 GB limit for
2 hour movie.

>mencoder input.vob -oac copy -ovc xvid -xvidencopts
>max_key_interval=125:pass=1:bitrate=739:me_quality=5:4mv -sws 2 -vop
>scale=544:304,crop=702:556:8:8 -o /dev/null

Is there a reason you are using Xvid instead of ffmpeg's MPEG-4 coder?  I
thought the latter would be better, or is there significant difference

Have you experimented whether -sws 2 or 9 is better (or something
else?). I'm using 9, I suppose it should be better in theory?

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