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Wayland dmabuf video output not available from `cvlc` #223

Open hughmcmaster opened 6 months ago

hughmcmaster commented 6 months ago

I'm trying to play a 1080p25 video (bitrate ~8,000 kb/s; Main@L4.0) in VLC. Playback is acceptable but not completely smooth.

Playback is best when using Wayland dmabuf video output compared to OpenGL for Embedded Systems 2 output.

I'd like to use Wayland dmabuf video output from the command line, but the output renderer is not supported for some reason.

vlc -v video.mp4 uses wl_dmabuf with DRM Video Accel for hardware decoding. cvlc -v video.mp4 uses gles2 gl with DRM Video Accel for hardware decoding.

This is replicated when using the python VLC bindings, which also fall back to gles2 gl. If I try to use wl_dmabuf with the python VLC Instance (--vout=wl_dmabuf), the console is spammed with:

[0000007f9c046d80] main video output error: video output creation failed
[0000007fa400b3c0] main decoder error: failed to create video output

This occurs on Raspberry Pi 4 8GB running Bookworm with wayland. Linux 6.1.0-rpi8-rpi-v8 #1 SMP PREEMPT Debian 1:6.1.73-1+rpt1 (2024-01-25) aarch64 GNU/Linux

Is there a way to use wl_dmabuf via cvlc and the python VLC bindings?

ghollingworth commented 6 months ago

cvlc is just a script which ends up being

exec /usr/bin/vlc -I dummy "$@"

hughmcmaster commented 6 months ago

Fair enough. A better question then: why is wl_dmabuf not supported via the dummy backend?

Does wayland require a window?