On Wed, 7 Jan 2004, George Kola wrote:
> 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
AH, great - nice when advice works out well.
> I picked up smilutils-0.1.2 from
> http://users.pandora.be/acp/kino/smilutils.html . I compiled ffmpeg from CVS
Hmmm, that's quite old. I know that 0.1.3 was released some time
ago, not sure where the download link for that is hidden though.
> 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
Hmmm, that might just be ./configure looking for libdv. What version
of libdv are you using?
> try smilutils from cvs ?
That's what I do ;)
When you built smilutils with
./configure --with-avcodec --with-avcodec-include=/usr/local/src/ffmpeg/libavcodec
did you see a line like this in the configure output?
checking libavcodec version (build >4644)... yes
That indicates that the libavcodec includes and library were
successfully and correctly detected. If that says "no" then
look at config.log to find out what went awry.
> 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
Hmmm, what is the symptom/error? I use smil2wav on huge (20GB)
files without a problem - but then I'm using 'raw DV'.
What I have seen happen (and it's not consistent from system to system
which means it could be a threading/race issue) is that sometimes
using a .avi or .dv file doesn't work but if I create a .smil xml file
that spans the whole avi/dv then smil2wav will accept that. Strange.
I'm wondering if the large files you have are using the ODML format
or some other (non-standard) method of handling AVI files over 1GB.
> 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 ?
Should work fine - I've done that on occasion.
> > smil2yuv -i 2 redhotridinghood.dv | \
...
> > y4mscaler -O chromass=420_MPEG2 | \
> When should I use y4mscalar and when should I not use it. I want
Always.
If any scaling or chroma conversion is needed use y4mscaler.
> 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
Well, for best performance turn off the hyperthreading - it did
nothing but slow things down (I've a dual 2.2 Xeon system from a couple
years ago). Some OSs are better at avoiding the slowdown than
others (the BSD systems treat the pseudo-cpus are full heavyweight
cpus and that slows things down a lot, Linux was better but was
still slower with hyperthreading enabled than if hyperthreading was
turned off in the BIOS).
y4mscaler -S option=cubicCR -O preset=VCD
or for SVCD/CVD I've had good luck with
y4mscaler -S option=sinc:8 -O preset=CVD
(or SVCD - depends how much you want to fit on a CD-R)
For DVDs there's no scaling involved (unless you want the 1/2 D1
resolution - in which case the "CVD" preset [352x480] will work fine).
(hmmm, come to think of it - y4mscaler needs a cropped D1 preset that
would give 704x480/576 which is also a valid DVD size)
Try finding smilutils 0.1.3 or the cvs version and see if that
works better for you.
Cheers,
Steven Schultz
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