On Thu, 11 Aug 2005, CPM wrote:
> In Kino, they use yuvdenoise like this:
>
> ...|yuvdenoise -F -f | yuvscaler -v 0 -O VCD -n p | mpeg2enc -v 0 -f 1
> -I 0 -n p -a 2 -o 'cliptestc'.mpv'
>
> or like this:
>
> ...|yuvdenoise -F | yuvscaler -v 0 -O VCD -n p | mpeg2enc -v 0 -f 1 -I 0
> -n p -a 2 -o 'cliptestc'.mpv'
>
> As mjpeg has changed, which is the good new version?
None of the above :)
> 1) yuvdenoise -F => ... | yuvdeinterlace | yuvdenoise | ...
> 2) yuvdenoise -F -f => ... | yuvdeinterlace | ...
> 3) yuvdenoise -F => ... | yuvdeinterlace | yuvdenoise | ...
> 4) yuvdenoise -F -f => ... | yuvdeinterlace | ...
yuvdenoise does not support -F so the correct usage is simply
"yuvdenoise" (slightly old versions may support "-f" but the cvs
version has neither -F or -f).
> The goal is to transform DV file in a mpeg file (VCD, SVCD, DVD).
Oh, ok - so you will be doing the encoding multiple times (once for
each format).
VCDs (mpeg2enc -f 1) is progressive MPEG-1. 'yuvscaler' will
automatically deinterlace when "-O VCD" is used - thus 'yuvdeinterlace'
is not needed. I think, from a very quick look at the yuvscaler code,
that the two fields are blended together during the downscaling. It
may be preferable to use 'y4mscaler -O preset=VCD '-I ilace=BOTTOM_ONLY'
(y4mscaler can be found at http://www.mir.com/DMG/Software/)
SVCDs use MPEG-2 and one of the big avantages of MPEG-2 over MPEG-1
is the support for interlaced video! So in this case also you probably
do not want to use 'yuvdeinterlace'. For SVCDs:
... | yuvdenoise | mpeg2enc -f 4 -q 5 ... | ...
Similarily for DVD it is probably better to not deinterlace (that
can be done at playback time in most MPEG playing software). Simply
denoise and go into the encoder:
... | yuvdenoise | mpeg2enc -f 8 -q 4 ... | ...
Another denoising program that is part of mjpegtools is 'y4mdenoise',
you may want to experiment with that and see how it works for you.
DVD (and to a slightly lesser extent) encoding parameters have been
the subject of MUCH discussion on this list. I think if you browse
the mailinglist archives you will find some useful information about
setting the bitrate, selecting the quality (-q) and other options.
My personal preference is to never deinterlace at encoding time
(NOTE: this is not the same thing as removing the NTSC 2:3 pulldown
for material which originated on film). Deinterlacing can be done
at playback time (MPlayer for example has numerous filters to do this).
Good Luck!
Cheers,
Steven Schultz
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