On Tue, 25 Jan 2005, Matto Marjanovic wrote:
> The "-I sar=1:1" to y4mscaler is unnecessary --- the correct SAR will
> be read from the stream which ppmtoy4m creates. (And if that SAR
True - it is un-necessary. But when I use "-I sar=1:1" it is not
to _override_ but to _remind_ - it's an explicit pointer to me
what's going on. The input, in my case, is already 1:1 but I chose
to use the -I sar as a hint to me (not y4mscaler).
> -fix- the source, instead of -overriding- the source.)
>
> Same goes for mpeg2enc's "-a 1", "-F 2", and "-I 0".
Now that I agree with 100% (and I think I also made that point). If
mpeg2enc isn't giving the expected results then the stream is not
properly formed and needs to be fixed.
> For y4mscaler, you could use "y4mscaler -I norm=PAL -O preset=DVD",
> and the 'norm=PAL' is only necessary because of the weird framerate.
>
> If you want to use the 704x576 framesize, (until I make a preset
> option for it) you could do
> "y4mscaler -I norm=PAL -O preset=DVD -O size=704x576"
Except when coming from the miniDV camcorder I always use
704x480 (or for very long playing discs the "CVD" 352x480 size).
If you're using a Canopus (or other analog -> DV converter) take a look
at one of the frames some time - you will _plainly_ see the 704x480
or 704x576 frame inside the 720xN DV frame and 8 pixels of junk/black
on each side.
Hmmm, not sure what would be a good name for the preset. In Apple's
parlance the 704 size is what they call "cropped D1" (D1 being
720x486).
Cheers,
Steven Schultz
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