> From: Davros <[EMAIL PROTECTED]>
> The mjpeg-howto suggests using ac3dec and related and, I guess, uses it
> in the mpegtranscode script. What version should I compile, patched or
> unpatched? It spits out a SYNC value - is this just how it works, or,
> is this require in general?
You need that SYNC value for the mplex program when you multiplex
the newly created video stream with the audio stream:
mplex -f 4 -O SYNCvalue -o newfile.mpg file.m2v file.mp2
> What I mean is, I don't want my svcd to be out of sync - there are other
> tools to extract audio - should I choose ac3dec just _because_ it
> spits out a sync value? The README suggests that most folk won't find
Yes, if you don't get the SYNC value then the audio and video will
be out of sync. You can use ac3dec just to get the SYNC
value and then use whatever program you want to extract the audio.
There are other programs that can be used to determine A/V offset
of a VOB but none are as explicit as the modified ac3dec. '
> Can you tell me which is better, having mpeg2dec spit out an svcd
> stream, or just a YUV stream and use yuvscaler to do it?
mpeg2dec does not emit 'svcd steams' at all. mpeg2dec (the modified
version that knows about yuv4mpeg output) offers a choice of:
xv
x11
sdl
YUV
YUVh
YUVs
null
nullslice
nullrgb16
nullrgb32
pgm
pgmpipe
md5
none of those are "svcd streams". You want 'YUV':
mpeg2dec -o YUV ...
and then use either yuvscaler or y4mscaler (not presently bundled with
mjpegtools, y4mscaler can be downloaded from: http://www.mir.com/DMG/)
to do the scaling to SVCD resolution.
mpeg2dec -o YUV ... | yuvscaler -O SVCD | ...
Good Luck!
Steven Schultz
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