Re hwdec:
https://git.srsfckn.biz/mpv/commit/?id=dbef5b737e2f994f02923c8214cba368b663a655

Also, off the top of my head:
- vaapi-egl does not work on AMD hardware AFAIK, breaking hwdec on Wayland and 
resulting in low-quality or incorrect color conversion when vaapi-glx is used
- VDPAU does not support 10-bit video (and 8-bit HEVC is buggy with NVIDIA 
drivers), is generally broken with FOSS drivers
- CUDA decoding is just broken in general
- there’s this gem https://github.com/mpv-player/mpv/issues/4383
- video filtering does not work with non-copy hwdec

Also, at least in my testing, I’ve noticed no energy savings when using
hwdec, on both desktop (measuring at the wall) and my laptops (according
to PowerTOP). Nobody ever bothered to extend the comments in the default
config after all those issues that were encountered. Perhaps I should do
that.

If you *really* want to enable hwdec despite all that, at least restrict
it to the “safer” -copy modes by using auto-copy.

Re Wayland:
- video-sync=display-resample is unavailable with the Wayland backend, which 
also breaks interpolation (a very popular feature to reduce judder)
- Wayland support in mpv is not mature by any stretch, plus we have less than 
one person available to work on it regularly

** Bug watch added: github.com/mpv-player/mpv/issues #4383
   https://github.com/mpv-player/mpv/issues/4383

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https://bugs.launchpad.net/bugs/1708102

Title:
  Enable hardware video decoding by default in mpv

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