[MPlayer-users] Re: Mpeg2 encoding results

Michael Niedermayer michaelni at gmx.at
Fri Sep 5 12:43:38 CEST 2003


On Wednesday 03 September 2003 00:17, Nico wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> Hi,
> >can u upload (to ftp://mplayerhq.hu/MPlayer/incoming and tell us that u
> > did) short samples (orginal source, lavc encoded, xvid encoded & command
> > line options used for both encodings) which show these problems (gray
> > blocks & mosquitos)
> In incoming/comparison/ there are three files:
> 1cnt.mpg and 1p.avi are from the same clean dvb capture.
> The mpg was generated with
> mencoder -nosound -ovc lavc -lavcopts
> vhq:vcodec=mpeg2video:vrc_maxrate=9000:vbitrate=1500:vpass=[12] the file is
> the second of two passes
> the avi with
> mencoder -nosound -ovc xvid -xvidencopts
> bitrate=1000:pass=[12]:me_quality=6 -vf crop=<something>,scale=704:416
> (mplayer reports 1400 kb/s, but it's really 1000)
so we have different resultions, different bitrates, and the scenes neither 
match, the xvid file has 3.2Mb / 704x416 / and the lavc mpeg2 has 1.2Mb / 
704x576 its not too surprising that the xvid file looks better (yes, a larger 
file allows the 2pass code to distribute the bits better)

so if u want to see any impovements then u have to provide the SAME video at 
the SAME bitrate/resolution encoded as xvid & lavc & the orginal

level[i]= get_vlc(); i+=get_vlc();		(violates patent EP0266049)
median(mv[y-1][x], mv[y][x-1], mv[y+1][x+1]);	(violates patent #5,905,535)
buf[i]= qp - buf[i-1];				(violates patent #?)
for more examples, see http://mplayerhq.hu/~michael/patent.html
stop it, see http://petition.eurolinux.org & http://petition.ffii.org/eubsa/en

More information about the MPlayer-users mailing list