> NTSC Setup/Pedestal
> ===================
> The decoder's add_ntsc_setup option should only be used
> by North American NTSC users when viewing the video on your computer
> monitor. It should never be used when transcoding, image processing,
> or rendering.
That doesn't make any sense. I mean, the logic just isn't logical.
If 16 is black for transcoding and image processing, it should be black
for the display, too.
I hunted around on the net, and I'm inclined to agree with you. For example:
http://www.adamwilt.com/DV-FAQ-tech.html#Setup
I went and checked out the histograms from yuvcorrect like you suggested,
and, lo and behold, smil2yuv *is* adding an additional 16 to the luma.
(i.e. the smallest Y' value I see in the output is ~32...)
In theory you can set the right variable in ~/.gnome/kino to turn this
off, but both smil2yuv and kino seem to be having problems
reading/writing that file for me just now. It's easy to fix in the
source, just change the line
dvDecoderAddNTSCSetup = gnome_config_get_bool( "dvDecoderAddNTSCSetup=true" );
to
dvDecoderAddNTSCSetup = gnome_config_get_bool( "dvDecoderAddNTSCSetup=false" );
in libkino/preferences.cc.
That 'add_ntsc_setup' doesn't make any sense to me whatsoever; I get the
impression that someone jumped to a wrong conclusion when they read some
specification.
Have you asked about this on the libdv or kino lists? I'm curious
to see what kind of reasoning those guys give when pressed for a
better explanation. (And if *I* am wrong, I want to be
corrected!)
I'm not on either list, and I have not been able to access any
archives of the libdv list. So no, not yet. I did browse the kino
message boards, and only found a slight mention of the setup issue
that might suggest you are correct as to its origin.
Dan
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