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2000-04-20
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File : DolbyCanyonIVTC.avi & DolbyCanyon_raw.avi
can_ivtc.avi - DolbyCanyonIVTC 352x240 23.976 fps
can_raw.avi - DolbyCanyon_raw 352x240 29.97 fps
egy_ivtc.avi - DolbyEgyptIVTC 352x240 23.976 fps
egy_raw.avi - DolbyEgypt_raw 352x240 29.97 fps
tra_ivtc.avi - DolbyTrainIVTC 352x240 23.976 fps
tra_raw.avi - DolbyTrain_raw 352x240 29.97 fps
Source : DolbyDigitalCanyon.vob
DolbyDigitalEgypt.vob
DolbyDigitalTrain.vob
ftp.csst.net/csst/Dolby (login:csst passwd:csst)
Although the source material is obviously computer-generated,
the rendered-output is 24fps progressive. Hence, the
video-sequence can be treated as a 24fps film source.
The MPEG-2 video is coded as an interlaced sequence,
with NTSC 3:2 pulldown. Coded picture rate : 29.97Hz
Conversion:
mpeg2avi.exe -b source.vob -f0 -r -s4 -2 -1 352 240 -o7 IVTC.avi
mpeg2avi.exe -b source.vob -f1 -r -2 -1 352 240 -o7 raw.avi
(FPU-IDCT, half-resolution output, crop to 352x240)
encoding time was ~11min on a Celeron-450, Win98SE
no audio, Microsoft MPEG-4v3 @ 600kbps, 1keyframe/s, sharp:100
The *_raw.avi file is a straight MPEG2->AVI transfer. The
resulting AVI exhibits hairline weave artifacts due to the
source M2V's hardcoded 3:2 pulldown. The rawAVI's frame-rate
is 29.97Hz, to match the source M2V's playing time.
The *IVTC.avi file is the same M2V->AVI transfer, but with
the inverse-telecine algorithm (-s4) enabled. The IVTC.avi
file has 20% fewer frames, and therefore plays @ 23.976fps.
(Please note that the compression artifacts are a result of
severe video bitrate reduction, not the IVTC process!)
Notes:
DolbyDigitalBroadway.vob starts as a 3:2 pulled sequence.
Toward the end (the shimmering light logo) the source
changes to 30fps video (2:2 pulldown.) Due to the presence
of both content types (24fps film & 30Hz video), this clip
cannot be inverse-telecined.
*For playback to be smooth, CPU should be very fast ( >300MHz.)
http://m3.easyspace.com/liaor2/
http://www.dvdsoft.de