Chromium GPU support on Manjaro

[krist]

Binaries called "chrome" or "chromium" are explicitly blacklisted by the panfrost driver.

Is that the reason caidao works? 

(Note that apart from Chromium, hw decoding works just fine for me in Manjaro using mpv for example.)   

I don't really believe that, especially the "just fine" part. I would really like to know which libraries you compiled and with which flags.
What does mpv say when you push Ctrl+h during a video?

Of course you're right, I mixed up GPU/VPU. mpv does NOT use hw-accel. video decoding, but it does use the GPU Renderer via Panfrost:

[vo/gpu/opengl] EGL_VERSION=1.4
[vo/gpu/opengl] EGL_VENDOR=Mesa Project
[vo/gpu/opengl] EGL_CLIENT_APIS=OpenGL OpenGL_ES 
[vo/gpu/opengl] Trying to create Desktop OpenGL context.
[vo/gpu/opengl] Choosing visual EGL config 0x5, visual ID 0x21
[vo/gpu/opengl] GL_VERSION='2.1 Mesa 20.1.0-devel (git-ff8daa0136)'
[vo/gpu/opengl] Detected desktop OpenGL 2.1.
[vo/gpu/opengl] GL_VENDOR='Panfrost'
[vo/gpu/opengl] GL_RENDERER='Mali T860 (Panfrost)'
[vo/gpu/opengl] GL_SHADING_LANGUAGE_VERSION='1.20'
…
[cplayer] VO: [gpu] 1280x720 yuv420p
[cplayer] VO: Description: Shader-based GPU Renderer