[a footnote:]

 ...
 >      This particular movie is black and white so the chroma is killed with
 >      'y4mshift -M' (sets U and V to 128).
 ...
 >mpeg2dec -s -o pgmpipe foo.vob | \
 >     pgmtoy4m -i t -a 10:11 -r 30000:1001 | \
 >     y4mshift -M | \
 >     y4mscaler -v 0 -S option=sinc:8 -O preset=CVD | \
 ...

[You can specify "-S mode=mono" to y4mscaler, and it will treat the source
 as a mono stream.  Then, in addition to zeroing the output chroma channels,
 it will skip scaling them altogether.]

[-matt m.]



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