Thanks a lot Steven. Your suggestion is very useful and solved most
of my problem. I had some problems with my computer setup and took quite
some time sorting. I have some more questions :).
> Do you have the 'smilutils' (alternatively called
> smiltools)? You
> should be able to use those instead of lav* to do the
> conversion from
> DV to YUV4MPEG2. As a matter of fact I've been using smil2yuv
> for a long time - and you can build smil* against
> ffmpeg/libavcodec
> for the DV decoding. Why would you want to do that?
> How's a ~10%
> reduction in final MPEG2 bitrate sound? libavcodec/dv
> produces better
> output that libdv according to all the tests I've run.
>
> You could even use 'smil2raw' to convert the AVI files
> to raw DV files
> if you wanted to. Very useful adjunct to mjpegtools -
> look around
> kino's site (I can't remember if there's a pointer to
> smiltools or
> not). Alternatively you can check out the CVS version from
>
> cvs -d
> :pserver:[EMAIL PROTECTED]:/cvsroot/kino login
> cvs -d
> :pserver:[EMAIL PROTECTED]:/cvsroot/kino co smilutils
> cd smilutils
> cvs logout
> ./bootstrap
> ./configure --with-avcodec --with-avcodec-include=.../libavcodec
> gmake
I picked up smilutils-0.1.2 from
http://users.pandora.be/acp/kino/smilutils.html . I compiled ffmpeg from CVS
and used the --with-avcodec-include to point to the include from ffmpeg
installation. I find that smilutils still looks for libdv. Do you want me to
try smilutils from cvs ?
More importantly, smil2wav does not support the large DV, I could
not figure out why. At present, I have an option of generation the mpeg-2
audio stream from mencoder and the video streams using mjpeg-tools and
mplexing them. Should I be worried about A/V sync problems if I do that ?
>
> LOTS of useful filter programs, and utilities in the kit.
>
> I typically use it thus:
>
> smil2yuv -i 2 redhotridinghood.dv | \
> yuvdenoise -S 0 -l 1 | \
> y4mscaler -O chromass=420_MPEG2 | \
> bfr -b 10m | \
> mpeg2enc -f 8 -M 2 -E -10 -2 1 -q 6 -K kvcd -o foo.m2v
>
> which leaves the 4:1:1 to 4:2:0 conversion in
> y4mscaler's _extremely_
> capable hands.
When should I use y4mscalar and when should I not use it. I want
both mpeg-1 and mpeg-2 and I have lots of CPU (dual xeons 2.8 Ghz with
hyperthreading). I want vcd mpeg-1 and dvd mpeg-2 and the best quality
possible.
Thanks,
George
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