On Mon, 25 Aug 2003, William R Sherman wrote:
> Well then three cheers to Steven:
> Hip hip hooray
You can say that after the gaffe I made with the Red/White/Yellow
connectors? ;)
Gee thanks!
> One question though, the past couple days people have mentioned that one
> should use the DV capabilities of the ffmpeg library rather than some
> other library, and it isn't clear to me if I'm using dvgrab and/or kino
> to capture video, am I using the wrong thing? I have a very recent version
> of ffmpeg (to get the Sorenson-3 decoding), but I don't recall which
> application uses which library.
For capturing 'dvgrab' is my tool of choice also.
Capturing and decoding to 4:2:0 for mpeg2enc are two different
things though. dvgrab/kino store the data as 4:1:1 (for NTSC)
but at some point in time that needs to be converted to 4:2:0
for encoding to MPEG-2
I've found that doing as much as possible in 4:1:1 and converting
to 4:2:0 at the last moment produces better looking output at
a lower bitrate. At least 2 of the filters (yuvdenoise and
yuvmedianfilter) support the 4:1:1 colorspace - thus they can work
on the data prior to 4:2:0 conversion.
If you have a recent ffmpeg on the system (do a 'make' but skip
the 'make clean') then build the smilutils with something like:
./configure --with-avcodec \
--with-avcodec-include=/usr/local/src/ffmpeg/libavcodec
Then use "smil2yuv -i 2 ... | yuvdenoise | yuvmedianfilter ... "
Immediately prior to going into the encoder (mpeg2enc) use
y4mscaler to convert from 411 to 420:
y4mscaler -O chromass=420_mpeg2
> > to 1.6.1. Most importantly, this release allows full-fledged DVD
> > creation.
>
> And like one other reader, I'm curious as to what exactly this means.
> Haven't we already been making full-fledged DVD's, and in my case,
There were issues with mplex and mpeg2enc that caused problems
(2GB limit, timestamps, etc) with some DVD players. Also some
fixes were made to interoperate with dvdauthor - dvdauthor had
some misassumptions about the MPEG2 header format and mplex
knows (now) how to work around those.
Cheers,
Steven Schultz
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