OK, riddle me this.
I have a script that I use for converting a smil file (of edited DV) to DVD-compatible mpeg. The script looks like this:
----------------start script---------------- #! /bin/sh
mkfifo stream.yuv mkfifo video.yuv
smil2yuv -a "${1%.smil}.mp2" "$1" >stream.yuv &
cat stream.yuv | yuvdenoise -S 0 -b 4,4,696,468 | y4mshift -n 8 >video.yuv &
cat video.yuv | dd obs=1M | mpeg2enc -E -10 -K kvcd -S 400 -B 384 -f 8 -q 5 -b $2 -r 16 -4 4 -2 4 -N 1.0 -I 1 -o "${1%.smil}.m2v" -v 1
mplex -f 8 -o "${1%.smil}_%02d.mpeg" "${1%.smil}.mp2" "${1%.smil}.m2v"
rm -f "${1%.smil}.mp2" "${1%.smil}.m2v"
----------------end script------------------I am using the latest CVS version of the mjpegtools.
Now here's the confusion. If I use it like this:
smil2dvdbits Capture1.smil 5400
on roughly two hours worth of video, I get about 4.2 gigs of mpeg data out, which is just about right to fill a DVD-R.
However, today I had a shorter clip to work with, and discovered something that seems strange. If I do this:
smil2dvdbits Capture1.smil 8000
On the same 2-hour clip, it comes out at about 2.5 gigs. Huh? How is that possible? The average bitrate drops *way* down (from roughly 5400 to about 2500), but the peak rate is near the 8000 I set.
This makes no sense to me. How is specifying a higher bitrate able to produce a smaller file? In each case so far, a *much* smaller file (roughly half)!
Don't misunderstand, I'm thrilled if this is expected behaviour -- I'm just concerned that something is horribly wrong somewhere. Any thoughts?
-- Robert Kesterson [EMAIL PROTECTED]
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