[vdr] Re: vdrconvert with new mjpegtools 1.6.3 and transcode 1.0

Ville Skyttä vskytta at gmail.com
Tue Sep 6 20:27:58 CEST 2005


On Tue, 2005-09-06 at 11:08 -0700, C.Y.M wrote:

> Unfortunatly I backed everything down until a patch was released, but the
> problem was in vdr2dvd.sh on the ppmtoy4m lines.

I don't know about vdrconvert, but a problem that sounds like the same
was solved in vdr-burn 0.0.6i-pre2 by piping the output of ppmtoy4m to
"y4mscaler -O chromass=420_MPEG2" and then to mpeg2enc, ie. not directly
from ppmtoy4m to mpeg2enc.  That should work for all versions of
mjpegtools, but requires y4mscaler.

It's also possible to fix it without y4mscaler by adding the "-S
420mpeg2" option to ppmtoy4m, but that would require mjpegtools >= 1.6.3
(it was something else than 420mpeg2 in earlier versions) and my
ppmtoy4m man page has this to say about -S anyway:

   The  subsampled  modes  use  a  lousy  subsampling  filter; better
   results will be achieved by passing the default 4:4:4 output to  a
   scaler which supports subsampling, such as y4mscaler(1).





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