Use compatible decoders for videos with alpha channel

[Zipdox2]

Expected behavior of the wanted feature

MPV's default decoder selection doesn't consider whether the decoder can decode the alpha channel if a video has it. Hardware decoders typically do not support decoding the alpha channel. Additionally, the default VP8 and VP9 decoders don't either, libvpx and libvpx-vp9 have to be specified in the config.

Presently in order to play transparent videos I have to use this config:

background=none
vd=libvpx-vp9,libvpx
hwdec-codecs=h264,vc1,hevc,av1,prores

This completely disables hardware decoding for VP8 and VP9, regardless of whether the video has an alpha channel.

MPV should check if the video has an alpha channel and choose an appropriate decoder to decode it. Only this config should be necessary:

background=none

Alternative behavior of the wanted feature

No response

Log File

No response

Sample Files

kinda.hot.webm