On Wed, 17 Dec 2003, Al Bogner wrote:
> Which matrix would you use for (S)VHS-sources?
>
> -K tmpgenc?
That'll work fine. That is a good middle ground between the
default tables and the kvcd (-K kvcd) tables.
Which one to use is a matter of playtime and quality. The kvcd
matrices are more aggressive about not retaining as much high
frequency information which might result in softer images (less
detail on edges for example) but will give more playing time. For
casual viewing it might be entirely adequate.
On average -K tmpgenc lowered the bitrate about 10% from the
default and -K kvcd about 16%. It depends on how low you're
setting -q (how close to the limit the encoder is being pushed)
of course.
For noisier material the thing to do is turn off B frames with
-R 0. That is a big win - almost "for free" in that it lowers
the bitrate without a tradeoff for quality.
Less effective, but doesn't cost any cpu time extra really, is
"-E". Try a modest value of "-E -8" or -10.
Cheers,
Steven Schultz
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