The man page for ppmtoy4m does not list any options to
adjust the quality setting (quantization level) for the
For example, here is the command I am using from
qdvdauthor to generate the menu:
jpegtopnm "/tmp/Hanne/Main Menu VMGM/background.jpg" |
ppmtoy4m -n 1 -F25:1 -A59:54 -I t -L -S 420mpeg2 |
mpeg2enc -b 8000 -f 8 -n p -o "/tmp/Hanne/Main Menu
The file "/tmp/Hanne/Main Menu VMGM/background.jpg" is
perfect to the nakede eye and mpeg2enc lets me set the
bitrate to be DVD quality, but the quality is still
degraded to the point that the readibility of the text
is reduced, apparently because the default quality
level of ppmtoy4m is set fairly low; and there is no
option to increase it.
The ability to specify a higher jpeg quality for the
output of ppmtoy4m would be useful.
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