** Changed in: linux-raspi (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1905272
Title:
Can't get h/w video acceleration on rpi4
Status in snapd:
New
Status in linux-raspi package in Ubuntu:
Invalid
Bug description:
Hi, we've run into an issue where we can't get h/w video acceleration
working on rpi4 on ubuntu core 18 (and 20).
Our snap is using the following stack:
Qt 5 eglfs + gstreamer + mesa.
Raspberry's config txt has: dt_overlay=vc4-fkms-v3d, gpu_mem=256.
I've enabled all video/opengl related interfaces:
- opengl
- hardware-observe
- framebuffer.
Gstreamer can't detect that it has support for h264 h/w decoding using
v4l2 plugin. The very same snap unpacked on the raspbian and that is
running in a pretty same way it is on the core immediately detects
that h264 decoding is available (i.e. I unsquashfs it there, set the
LD_LIBRARY_PATH, WEBGL_DRIVERS_PATH, and all other environment
variables that are returned from `env` command when running snap run
--shell my_snap).
Because of that Qt falls back to the GStreamer pipeline with s/w
decoder (avdec) and outputs like 0.5 frames per second (I am not sure
if OpenGL actually works with h/w acceleration because even then it's
so slow).
Running on core 20 did not help - I tried running it in devmode as
well without any differences.
Raspbian, where it works, has 5.5 version of Linux kernel, I did try
the beta version of core 20 which had 5.4 kernel version but it made
no difference.
lsmod on raspbian shows some extra modules related to vc4 not present
on the core (not sure how relevant they are though):
- v4l2_mem2mem
- bcm2835_codec
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