Joe Barnhart wrote:
I'm not alone in my search for a decent tool to archive shows
originally broadcast on HDTV onto DVD media for keeping or sharing with
others. For example, I'm not an Elvis fan, but my friend is and I want
to give her a DVD of the recent broadcast she missed.
The show is about 16G bytes in its original 1080i presentation. There
is a simple scaling relationship between the original format (1920x1080
MPEG2-TS) and the desired format (720x480 MPEG2-PS). Why is there no
program that takes one MPEG2 stream and scales it by a simple fraction,
without decoding and re-encoding the MPEG structure?
What you're asking is impossible; MPEG doesn't work that way. The only
lossless manipulation of MPEG data that might be possible would be to crop the
frame to a smaller size (you would need to crop by multiples of 16 if you were
to do this) or rotate the entire frame a multiple of 90 degrees. MPEG video
gets coded in macroblocks of (typically) 16x16 pixels. To scale the video, you
would have to decode the macroblock, scale it, and create a new macroblock.
For shrinking from HDTV to DVD, each new macroblock would pull data from
several macroblocks in the original video.
_/_
/ v \ Scott Alfter
(IIGS( http://alfter.us/ Top-posting!
\_^_/ rm -rf /bin/laden >What's the most annoying thing on Usenet?
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