Recommended bitrate for libvpx VP8 1080p Streams.

[Leo]

I encoded a raw 1920x1080p YUV 4:2:0 24 fps into H.264 / MPEG-4 AVC
with x264 using the preset veryslow and the crf of 15, and I got a
video file with a bitrate of 7576 kbps of purely video (the container
isn't counted here). What bitrate should I use with the libvpx VP8
encoder if I want to get quality similar to the video I described
above? (Note: The video above at 7576 kbps was transparent, meaning I
couldn't tell a difference between the lossless or the lossy version.)

[John Koleszar]

Since you're using crf mode, the analogous thing in libvpx is "CQ"
mode. If you're building from git, you can use this now with the
--end-usage=2 --cq-level=<n> parameters. If you're not building from
git, wait for the Bali release, which will be out shortly. You could
try something like '--end-usage=2 --cq-level=12 --target-bitrate=8000'
to get something comparable, and adjust the cq-level from there.

Note that in CQ mode the target bitrate field isn't really a "target",
it's an upper bound.