Fix _ColorRange, it's the wrong way around! #41
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DGIndex sets the "YUVRGB_Scale" in the D2V file as follows: 0 == TV == Limited 1 == PC == Full And VapourSynth reads _ColorRange as follows: 0 == PC == full 1 == TV == limited but `core.d2v.Source` was setting it the wrong way around, this can be considered a fairly big issue.
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Fixes: #40
Note: This should be re-opened.
Update: This pull request has been super-seeded by 700523c on the newffmpeg branch by removing the YUVRGB_Scale mappings to _ColorRange entirely, which is ultimately the better solution.
Since there's no data for color range in the MPEG ES structure, there's no way to inferr color range from the input stream, so _ColorRange should be assumed to be either limited/TV (1) as that's more likely than full/PC (0) or unspecified/NaN and let VS/user deal with it.
The current behavior is to map YUVRGB_Scale to the _ColorRange prop backward. As in, if YUVRGB_Scale is 1 (full/PC), then it sets _ColorRange to 1 (limited/TV) and so on.
Whereas it should set _ColorRange to the real color range by reading the value from the MPEG stream, or match the YUVRGB_Scale as that's our last hope of information on which range the input stream is. If we cannot read the color range from the MPEG stream, then all we can do is assume the YUVRGB_Scale is the input color range. We shouldn't assume the input color range is the opposite of YUVRGB_Scale.
This pull request only fixes it to map YUVRGB_Scale to _ColorRange correctly so that it isn't assuming the input color range is the opposite of YUVRGB_Scale. However, it would be even better to not use YUVRGB_Scale at all, or use it only as a fallback if the input color range cannot be read from the MPEG stream.
Current Behavior:
Behavior in this Pull Request: