[MPlayer-users] 2-pass HQ encoding with libavcodec

[Hans-Peter Raschke]

Arpi wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> 
> Who needs divx4 or xvid any more? :)
> Thanks to Michael, the libavcodec encoder was nearly rewritten nowdays.
> I've just encoded 2 chapters of the Contact DVD at 900 kbit, full resolution
> (720x576x25fps) using 2-pass and it's very good quality!
> (i've added 2-pass support today)
> 
> mencoder -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900:vme=5:vqmin=2 -pass 1
>   -nosound test.vob
> 
> vme selects motion estimation algo, best values are 5 and 4, don't forget to
> set it!
> 
> also note, that it encodes at 33 fps on p4, good, ehh?
> 
> anyway it seems that 2-pass doesn't help so much, it's very good even at
> 1-pass encoding, just set vratetol to something bigger, good value was 40000
> for me.
> 
> so, try it and tell us your opinion...
> use last-minute CVS from both mencoder and libavcodec!

Yes it is very fast (15fps with libavcodec to 11fps with xvid for 
480x576 movie on my 1060 Celeron). A quick look shows slightly better 
quality for libavcodec!

But in black scenes (totally black or in the prolog with some text) 
there are some funny coloured blocks appearing.

> 
> 
> A'rpi / Astral & ESP-team
> 
> --
> Developer of MPlayer, the Movie Player for Linux - http://www.MPlayerHQ.hu
> 
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HP