On Mon, 15 Dec 2003, Barry Roberts wrote:
> I have several dozen (s)vcd's I've made from digitizing the old VHS
> collection. Now I finally have a DVD burner (woohoo!) and I want to
> transfer them to DVD. I know I could get better quality by
> re-capturing, re-editing and re-compressing, but I'm lazy. I just
Well, you're going to have to decode ane recompress so it's a
tossup if that is going to be any faster than recapturing and
encoding...
>
> I tried using tcextract on the vcd mpegs and then re mplex-ing with
> -8. My DVD player wouldn't play that, though.
Right - that's because the encoded frame size of a standard SVCD
is 480x480. Legal sizes for DVDs are 720x480, 704x480, 352x480
MPEG-2, and 352x240 MPEG-1
> Does anybody have scripts/tools they use to do this? It is possible,
> right?
Yes, it's possible but if you have the originals around it'd be
just as fast and higher quality to recapture/transfer and encode.
You need to decode, rescale, and encode. And mjpegtools even has
a program specifically designed to deal with the pipe output format
of 'mpeg2dec'!
Off the top of my head ("finger memory") you'll want the latest
y4mscaler (0.6.1), a recent (preferably cvs) mpeg2dec (decoder) and
at least the current release candidate of mjpegtools. Oh, and a
demuxing tool (I use mpgtx but transcode might have a tool for that
also).
I'd recommend scaling down from 480x480 to 352x480 rather than up
to 704x480.
It goes something like this:
mpeg2dec -s -o pgmpipe input.mpg | pgmtoy4m -i t -a 15:11 | \
y4mscaler -S option=sinc:8 -O sar=20:11 -O size=352x480 | \
mpegenc -f 8 -E -8 -K tmpgenc -4 2 -2 1 -o output.m2v
I think I got it right - SVCDs have a SAR of 15:11 but the 1/2 DVD
size would have a SAR of 20:11. Matt? ;)
Then mplex -f 8 with the demuxed audio and voila - out comes a DVD
compliant .mpg file.
Not any faster really than recapturing and encoding though.
Cheers,
Steven Schultz
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