On Mon, 10 May 2004, Dan Scholnik wrote:
> You might even try running y4mspatialfilter before and after y4mdenoise
> in case the latter introduces any high-frequency artifacts.
Ok - this I have done. On the particular video being used (capture
from a VHS tape) using a 2nd y4mspatialfilter after y4mdenoise
saved about 3% on the average bitrate.
The numbers (Average/Peak, I framesize in bytes, P framesize in bytes,
no B frames were generated).
Raw (no filters): 5283/9014 52978 19797
y4mdenoise only: 4030/9067 48424 14523
y4mspatialfilter+
y4mdenoise: 3344/9136 45951 11633
y4mspatialfilter+
y4mdenoise+
y4mspat: 3224/9128 45510 11129
The pipeline ends up looking rather large (some might say "ugly" ;))
but a dual G5 system didn't seem to mind ;)
smil2yuv -i 2 -a $N.wav -i 2 $N.smil | \
y4mshift -n 0 -b 8,0,704,474 | \
y4mspatialfilter -L 5,0.75,4,0.75 -C 3,0.5,3,0.5 | \
y4mdenoise -t 4 | \
y4mspatialfilter -L 5,0.75,4,0.75 -C 3,0.5,3,0.5 | \
y4mscaler -v 0 -O size=704x480 -O sar=src -O chromass=420_MPEG2 | \
bfr -b 20m -T 70 | \
mpeg2enc -b 8000 -K kvcd -q 4 -2 1 -D 10 -M 2 -E -10 -c -f 8 -o $N.m2v
(the y4mshift is used to black out the VCR junk at the bottom of the
screen - yes, y4mscaler could have done the same thing but the script
was a cut&paste job from odds&ends laying about).
I'm in the process now of encoding a couple really poor tapes (EP mode
VHS) and so far y4mdenoise assisted by y4mspatialfilter is doing a
splendid looking job.
Cheers,
Steven Schultz
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