[MPlayer-users] libavcodec problems

[gabor]

i've experimented a bit more now...

maybe the codecs simply refuse to create larger files if they think 
there isn't so much information?

the worsening of the quality could be cause by the de-interlace filter ( 
-npp lb)... i lost the contours of for example texts in the movie...

gabor

gabor wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> hi,
> 
> i have problems with libavcodec..
> 
> i have a 80Mb avi  with [MPG4] video ( i don't know exactly which 
> mpeg4-mutant this is ) .. and i wanted to de-interlace it...
> 
> as mplayer told me the file's video stream was at 2400bkbps, i used:
> 
> mencoder -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=2400 
> neverwinter.avi -o out.avi
> 
> it produced a 40Mb file ( video data 1200kbps )...
> 
> i browsed thru the mail-archives, found vqmin=2... tried, no help.
> i tried then vme=5 ... no help ( i don't really know why should it help 
> )...
> 
> i looked thru the documentation, man-pages... i've found vratetol, but 
> the docs said the default tolerance is 1Mbyte... so i decided to leave 
> that switch out...
> 
> sorry i didn't send a bugreport, i'll do it if you tell so...
> 
> actually i NEVER EVER succeeded in creating a libavcodec encoded file 
> with acceptable filesize... it was always too small...
> 
> 
> maybe i don't understand something about libavcodec...
> 
> simply it's unable to create a file of given size ( i won't mind if it 
> would be 78Mb insted of 80, but it's 40 instead of 80 ).. and the 
> quality is of course worse than the original...
> 
> thanks,
> gabor
> 
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