custom mpv-webm

my improved version of https://github.com/ekisu/mpv-webm

Download Script	Download Config

renames avc and avc-nvenc preset back to mp4 and mp4-nvenc
allows for custom presets (such as x264 veryfast or nvenc P7)
various mp4-nvenc fixes
- actually works now
- crf works too
adds mp4-compat preset for compatibility with older devices
osd revamp
- shows output video length
- shows source video height and fps
- shows output video height and fps
- less useless text (you'll need to memorize the keybinds)
- cleaned up options page
more output fps and resolution options (900p, 144fps, 5fps, etc...)
speed controls (no guarantees this works)
other minor changes