On Sat, 22 May 2004, Dan Scholnik wrote:
> So, to sum up, I was just speculating that the extra 3% came not from
> removing y4mdenoise artifacts, but from the slightly heavier effective
> spatial filtering resulting from two calls to y4mspatialfilter. To find
> out for sure, run the 2 y4mspatialfilter calls back-to-back before
> y4mdenoise.
Ok - but that's the last 22 hours I'll spend with that for a while ;)
I used a capture from a low quality (EP mode VHS is about as low
as one can get ;)). Total play time was about 158318 frames or
88 minutes (black/white).
The difference is very slight but running the 2nd y4mspatialfiter
_after_ y4mdenoise is a little lower. Significant? Probably not, but
it didn't slow things down so saving the extra megabyte or so didn't
cost anything.
1) For y4mspatialfilter | y4mdenoise | y4mspatialfilter
INFO: [mplex] No. I Frames : 10757 avg. size 27568 bytes
INFO: [mplex] No. P Frames : 147561 avg. size 8845 bytes
INFO: [mplex] No. B Frames : 0 avg. size 0 bytes
INFO: [mplex] Average bit-rate : 2425600 bits/sec
INFO: [mplex] Peak bit-rate : 7731200 bits/sec
2) y4mspatialfilter | y4mspatialfilter | y4mdenoise
INFO: [mplex] No. I Frames : 10757 avg. size 28070 bytes
INFO: [mplex] No. P Frames : 147561 avg. size 8871 bytes
INFO: [mplex] No. B Frames : 0 avg. size 0 bytes
INFO: [mplex] Average bit-rate : 2439200 bits/sec
INFO: [mplex] Peak bit-rate : 7724800 bits/sec
at this point I'm not going to bother with another day's encoding time
to try the simpler case of "y4mspatialfilter | y4mdenoise". The
difference is probably not worth the time/effort.
It does, at least for VHS sources, appear to be worth adding a mild
y4mspatialfilter as a "low pass filter" before going into other
filters (such as y4mdenoise).
Cheers,
Steven Schultz
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