On Sun, 2 Nov 2003, Laurent Pinchart wrote:
> I'm trying to transcode a DVD to SVCD. The usual approach is, I think, to use
> mplayer or transcode to read from the DVD and output to a named pipe, and cat
> the pipe to yuvscaler and mpeg2enc.
Actually, for me, the usual approach is to use 'mplayer' with the
'-dumpstream' option. That gives me the complete stream in one
file. At that point I can run 'vstrip' if desired to remove
the unwanted audio streams, and so on.
> This, however, becomes a bit more complicated as the material I'm trying to
> convert is a DVD dump. I can read it using tccat | mplayer, but transcode
> doesn't accept directories as input.
Rather than convert a directory image/copy of the DVD I've found
it easier to deal with a single 'dump.stream' file. It's also
possible to selectively dump chapter ranges (-chapter 5-10) if
there is a subset that is of interest (perhaps one short subject
out of 6 on the DVD).
> What is the best way to convert the DVD dump ? I can use tccat | mplayer |
> yuvscaler | mpeg2enc, but using programs from 3 different projects
> (transcode, mplayer and mjpegtools) seems a bit complicated to do the simple
> operation I'm trying to achieve.
>
> Any help will be greatly appreciated.
Something like this (I'm doing this from memory since I did not
retain the script from the last time I did it):
mplayer dvd://TITLESET [-chapter X-Y] -dumpstream
then optionally run vstrip if desired to remove extra audio
streams, and so on.
mpeg2dec -s -o pgmpipe | pgmtoy4m | y4mscaler -O preset=SVCD |
mpeg2enc -f 4 ...
The audio is handled with 'mplayer -dumpaudio' or other method
of extracting the audio stream from stream.dump (if there's only
one audio stream it's easy - if there is more than one you'll
need to know the stream ID of course).
The pgmtoy4m program is from the cvs version of mjpegtools and
is a program specifically written to deal with converting the
(strange) pgm output of mpeg2dec into y4m.
That's how I do it ;)
Cheers,
Steven Schultz
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