I currently have this for the BD-Rate ranges in my Testing draft:
Low bitrate: 0.005 - 0.017 bpp
Medium bitrate: 0.017 - 0.058 bpp
High bitrate: 0.058 - 0.2 bpp
where bpp is width * height * framerate. These rates are spaced equally
on a logarithmic scale.
bpp is not perfectly resolution independent. We could instead specify
targets based on video resolution instead.
Another way to specify the ranges is by metric score, rather than rate,
but determining the ranges is a bit problematic. How I would probably
set these ranges would be to take these rates, and use them to set the
bounds based on a well regarded encoder (x264, for example).
The Requirements draft also currently specifies overlapping ranges. I
don't really see any reason to overlap them.
Rate targets are also needed for comparing videos. I suggest the
logarithmic centers of these rates:
Low: 0.009 (450kbps 1080p24)
Medium: 0.03 (1.5Mbps 1080p24)
High: 0.1 (5Mbps 1080p24)
Let me know how these currently fit into the use cases.
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