Mesa >=9.1 breaks VDPAU video output

[sebaro]

After upgrading from 9.0, the video playback is broken with the vdpau video output, with both mpv and vlc.

For HLS, the video is cut at the bottom and then stretched to fill the cut part, works fine with a different video aspect ratio (4:3).

mpv -vo opengl HLS
https://i.ibb.co/2hJpTCX/opengl.png
mpv -vo vdpau -video-aspect 16:9 HLS
https://i.ibb.co/2sPhxVQ/vdpau.png
mpv -vo vdpau -video-aspect 4:3 HLS
https://i.ibb.co/7jb6Ky5/vdpau43.png

For MP4, works fine with the video aspect ratio, but if I try with a different video aspect (4:3), it adds the bottom part but it doesn't stretch to fill it.

Works fine with opengl and xv video outputs.

Kernel: 4.19/5.0/5.1, Driver: amdgpu