Hi, all,
Sorry for the extended delay. y4mscaler v0.4.0 source and x86 binaries
are now available, at the usual spot:
http://www.mir.com/DMG/Software/y4mscaler.html
The delay was because I was planning to put up a good clear demonstration of
the benefits of using smil2yuv and y4mscaler in "4:1:1" mode to handle NTSC
DV video. I made up a test pattern which was sure to accentuate the effects,
but the effect ended up looking very subtle. In a sample I had used for
earlier testing, it was far more obvious. Since I'm not comfortable putting
up samples until I'm sure they provide incontrovertible proof (unlike some
people in this country), no samples just yet.
Anyhow, it certainly doesn't make anything *worse*. If anyone (Steve?) wants
to try some independent tests, comparing MPEG-2 bitrates between "-i0" and
"-i2" in smil2yuv at the head of the chain, I'd be happy to see what happens.
Oh, and for the bitrate-conscious: from the scaling-kernel comparison table,
it's apparent that the "cubicB" kernel has a bit more roll-off than the
"cubic" kernel --- this will fuzz out more detail, but should also allow
the encoder to compress the frame more.
Changes for this release:
Bugfixes:
o Still image presets are actually parsed and work.
o A few small fixes to fixed-point code in the scaling engine.
o Chroma subsampling mode taken into account when calculating chroma plane
scaling ratios.
Enhancements:
o Read/produce X-tags in stream header to identify chroma subsampling mode.
o Special-case code to read/write 4:4:4, 4:2:2, and 4:1:1 modes.
o New presets for 16:9 DVD, DV, and 16:9 DV.
o A few error/info messages offer better suggestions on resolving problems.
o Warning messages about chroma issues when casting 4:2:0 streams from
interlaced<->non-interlaced.
Web/Docs:
o Updated manpage; added "Notes on Chroma Subsampling"
o Kernel comparison webpage now has actual graphs of transfer functions.
-matt m.
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