On Tue, 10 Jun 2003, Steven M. Schultz wrote:
> Hi -
>
> Anyone used ppmtoy4m to create composited from PPM images
> (for example from a scanner/camera) for a DVD?
>
> It's working - but what I'm ending up with is 720x480 progressive
> and that's not, as far as I know, legal for use in making a DVD.
>
> What I'm doing so far is:
>
> (generate 720x540 PPM frames) | ppmtoy4m -F 30000:1001 | \
> y4mscaler -O size-720x480 -S option=sinc8lan -O chromass=420_MPEG2 | \
> mpeg2enc -f 8 -o intro.m2v
>
> Am I correct that I need to generate interlaced PPM frames for input?
As the source is progressive ppm frames, better keep it that way.
Use -F 24000:1001 and encode with pull down flag:
..|ppmtoy4m -F 24000:1001 -S 420_mpeg2 | y4mscaler -O size-720x480
-S option=sinc8lan | mpeg2enc -I 0 -f 8 -p -o ..
-L option to ppmtoy4m will not make any difference in this case as the
input is progressive. Its used to indicate interleaving when the
source is interlaced (ie with -I b or -I t).
I would use -S 420_mpeg2 at the ppmtoy4m stage instead of
resampling by y4mscaler as above.
Selva
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