On 12 Jan 2004, Craig Lawson wrote:
> Can someone help me out with a command line recipe for SVCD production?
> I am following the MJPEG Tools instructions, and I end up with an SVCD
> that works great with Xine on my system, but is unrecognized by both
> Macs and Windows, even when I directly open the mpeg file on the SVCD.
Do you realize that SVCDs use a different sector size than regular
CDROMs? You can't mount a SVCD and access the mpeg files due to the
mode2form2 sectoring - only the ISO track (the first few megabytes)
that contains the directory info can be accessed as a CDROM.
I have no idea if windows knows what a SVCD is or not, but on OS/X
you can use 'vlc' (http://www.videolan.org) to play SVCDs/VCDs just
fine. Even better is that vlc is available as a diskimage/package
which makes installation a breeze on a Mac.
> 1. Start with AVI files, DV format in Cinelerra.
>
> 2. Set project format to:
> Audio sample rate: 44100
> Frame rate: 29.97
> Width, Height: 480 x 480
> Color model: YUVA-8
>
> 3. Render with:
> Format: Quicktime for Linux
> Audio: Two's complement
> Video: Motion JPEG-A
> (Output verified with Quicktime + wine)
Why convert the video to MJPEG-A? Can you specify DV as the output
video codec? If the data came in as DV it should be possible to
use DV for output and that would be a lossless conversion as contrasted
to MJPEG-A - wouldn't it? If you have mjpegtools build with libdv
support it should handle DV in a Quicktime container.
> 4. Extract video and encode as SVCD-compatible MPEG-2:
> lav2yuv quicktime.mov |
> mpeg2enc -f 4 -q 7 -I 1 -V 200 -M 2 -o video.m2v
> (Output verified with xine; curiously, plaympeg shows
> only garbage)
Probably because plaympeg only knows about MPEG-1 video (if it is the
same program I remember from years ago) and hasn't the foggiest idea
how to deal with MPEG-2
Try 'mplayer' instead ;)
> 6. Merge audio and video:
> mplex -f 4 -b 300 -r 2750 audio.mp2 video.m2v -o svcd_out.mpeg
> (Output verified with xine; plaympeg fails again)
-f 4 will set all the necessary parameters for the SVCD format. No
need to give -b 300 or -r 2750 (in fact -f 4 overrides them I believe).
> 8. Burn a CD:
> cdrdao write --device 0,0,0 --speed 16 videocd.cue
> (Verify SVCD with xine, VCD mode)
mplayer vcd://2
would also work I think.
> This would all be great, except neither Macs nor Windows understand the
> MPEG file on my SVCD, nor the SVCD as such. I haven't tried it yet in a
> DVD player.
By default the Mac only knows about music CDs and DVDs. For VCD/SVCD
playback you need to get 'vlc'.
Many, but not all, DVD players understand SVCDs (mine do - I made sure
of that before buying them). Should only take a minute or two to
see if it works.
> (I'm currently avoiding transcode because it deadlocks on my SMP
> processor. Known problem in transcode.)
Hmmm, threading issues I suspect. I've had similar problems on other
operating systems even on single cpu systems - thus my feeling it's
a threading/mutex handling bug somewhere (transcode just goes to sleep,
doesn't spin wildly eating up cpu time).
Cheers,
Steven Schultz
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