x265 encoding

Some players rely on metadata to identify if the contents of the file can be used (i.e.: QT)

-tag:v hvc1

FFmpeg supports following presets: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, and placebo

According to:

• The `fast` preset
• FFmpeg preset comparison x265 2019; Encode speed and file size

and own fast tests:

  * veryslow: encoded 140 frames in 130.17s ( 1.08 fps), 1424.91 kb/s, Avg QP:27.02
  * slower:   encoded 140 frames in  66.19s ( 2.12 fps), 1412.11 kb/s, Avg QP:26.91
  * slow:     encoded 140 frames in  20.36s ( 6.88 fps), 1448.34 kb/s, Avg QP:26.61
  * medium:   encoded 140 frames in   9.44s (14.83 fps), 1260.54 kb/s, Avg QP:26.68
  * fast:     encoded 140 frames in   6.13s (22.82 fps), 1244.63 kb/s, Avg QP:26.71
  * faster:   encoded 140 frames in   5.02s (27.87 fps), 1221.05 kb/s, Avg QP:26.76

The default medium is enough (or even fast).

Preset: veryslow Ryzen 7 8c/16t