[MPlayer-dev-eng] comprehensive lavcopts test - in progress.

[Michael Niedermayer]

Hi

On Tuesday 15 June 2004 15:20, Jan Knutar wrote:
> > 1) PSNR ratio to filesize is also very important, not just PSNR
> > value, you should provide a difference in filesize as well (if any)
>
> For comparing PSNR ratio vs filesize, I think the only sane way is to
> use vqscale encoding, not 2 pass vbitrate encoding.
>
> It is my understanding that if you would compare file size AND psnr,
> WHILE using vbitrate 2 pass, all the adjusting of PSNR scores based on
> fielsize will just be random ratecontrol deviation noise.
>
> Could someone PLEASE explain this more clearer than I did? Or tell me if
> I'm wrong :-)
the correct way to compare is to plot PSNR vs. filesize curves but u need to 
encode at several bitrates or quantizers to do this

btw, such curves can easily be drawn with gnuplot

[...]
-- 
Michael
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
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