Can AVRational be used even through the values are essentially unsigned?
LibTIFF really likes to encode 0..1 values with denominator 0xFFFFFFFF.
floats do not have enough precission to store unsigned 32/32bit fractions
just consider a float has 32bit (and a good part is really small and large
numbers) the faction has 64bits with num+den.
Thats not awnsering your question but rather i wonder why you ask it here
instead of with floats
for 32bit signed fractions. i think the difference wontg matter but you
should probably test this ...
Of course floats don't have enough precision for exact values but that's not
the issue here as we only need to match the values (so some rounding is
actually good).
The point was that ffmpeg has AVRational that might be a cleaner approach at
handling given rationals than matching the other software's way (floats).
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