On Mon, Mar 28, 2005 at 05:02:18PM +0200, Jukka Tastula wrote: > 2500 is barely enough for an svcd. You can't seriously expect that to be > enough for 10 times the pixels, can you? I can't agree with you about this point, I use Q=1000 for pal resolution of VDR reccordings (3 pass mencoder) with thoses options : -vf crop=$2 -sws 2 -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=$Q:trell:mv0:mbd=2:v4mv:qprd:cmp=10:subcmp=10:mbcmp=10:predia=2:dia=2:vpass=1:turbo Doing the same with Q=2500 was not that bad on my source, but really not perfect... > Perfect quality? > mencoder -oac copy -ovc lavc -lavcopts \ > vcodec=mpeg4:vqscale=2:keyint=1:autoaspect (:ilme:ildct ) input -o output > > That'll make a big file though, probably bigger than the original, but > it'll be pretty much as good as it can get. Of course it'll be worse than > the original, lossy compression and everything. You probably wont notice. > ilme:ildct is probably a good idea if the source is interlaced. > > I'm not at all certain if mbd=2 and qns make any difference when encoding > with constant quantizer. Qns takes way too much time anyway at that > resolution so just forget about it. > > Obviously this isn't very useful. It'd be a much better idea to specify an > average bitrate and do a two or three pass encode. That way you can > control how big the output file gets. Mplayer docs describe the process > very well. I never thought of anything else than 3 passes :-) -- Gr?goire Favre ___________________________________________________________________ http://magma.epfl.ch/Gregoire.Favre mailto:Gregoire.Favre@xxxxxxxxx
