Hi -
> From: [EMAIL PROTECTED]
> I'm trying to get the best quality mpeg2 that I can before burning it
> to DVD. For some of the high action DV that I have taken, the encoded
> results look pretty poor even with the quality at highest setting (-q
> 1) and bitrate at 7.5Mps.
Hmmm, the DV sourced encodings I've done (from a Digital8 camera but
the DV format is the same) came out looking rather good at a -q of 6
(or sometimes 4).
Did you add the -N option to mpeg2enc's commandline? That's a (mild)
high frequency filter that will free up bits for stuff you can see.
Down the road a ways I believe Andrew will add "single coefficient
elmination" (borrowed from the ffmpeg MPEG-4 codebase) - that, in my
tests with good data sources, was good for about a 10% bitrate
reduction and no artifacts I could see (but then I do not claim to
have golden eyeballs ;)).
> I'd appreciate any tips anyone could offer on upping the bitrate and
> staying DVD compliant, and any tips on maximizing the encoding quality
> in general ...
Some people have found that using the denoiser and/or medianfilter
to be effective even with DV material. If -N to mpeg2enc is not
sufficient to achieve your goal then try "yuvdenoise -r 24 -l 1 -S 0".
Next try "yuvmedianfilter -t 6". Quite effective and looked good to
me.
Then try both of the above together without/with "mpeg2enc -N"
(warning: it bogs down a dual 2.2GHz P4 system quite noticeably;)).
If you do you the denoiser then "-S 0" should be used to avoid
introducting bitnoise (using "-S 0" also speeds up yuvdenoise about 20%)
Good Luck!
Steven Schultz
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