If the API to query the maximum throughput isn't available, it was
intended to fall back to balanced. This code caused it to vall back to
speed instead because if the API isn't available, max_throughput will be
0. This fixes it to make it only fall back to balanced instead.
Adds support for texture-based AMD encoding, with both H264, HEVC, and
HDR support. Falls back to FFmpeg when texture-based encoding cannot be
used for whatever reason.
(Jim note: This is based upon obsproject/obs-studio#4538 by AMD/Luxoft
with fewer files, FFmpeg fallback for software encoding, and HDR
support. I also went to lengths to ensure that FFmpeg command line
parameters also works with it)
Co-authored-by: Jim <obs.jim@gmail.com>
