[RPi4] Can't get Hardware HEVC Decoding

libretimebandit · September 10, 2024 at 5:15 AM

I have attempted all the things to get HEVC hardware decoding. Edited boot flags for 'dtoverlay=rpivid-v4l2' and 'dtoverlay=vc4-kms-v3d-pi4', but no luck with ffmpeg.

Anyone have HEVC hardware decoding working? And help?

Code

ffmpeg -hwaccel drm -v debug -i file.mp4 -f null -

Code

Successfully opened the file.
Device creation failed: -12.
No device available for decoder: device type drm needed for codec hevc.
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> wrapped_avframe (native))
 Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Device setup failed for decoder on input stream #0:0 : Cannot allocate memory
[AVIOContext @ 0x14907bb0] Statistics: 1278699 bytes read, 4 seeks

Reference:

HEVC hardware decoder support for raspberry pi 4 · Jellyfin Feature Requests

I am not sure if it is technically feasible. But now that Jellyfin has switch to V4L2 for hardware decoding/encoding starting from 10.8.0, is it possi

features.jellyfin.org

**chewitt** · September 10, 2024 at 11:32 AM

There's some CLI examples here: https://features.jellyfin.org/posts/2614/hev…aspberry-pi-4-5

libretimebandit · September 10, 2024 at 2:47 PM

Followed those examples and similar output - looks like that 'drm' device now found?

Code

Device creation failed: -12.
No device available for decoder: device type drm needed for codec hevc.
Stream mapping:
 Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_v4l2m2m))
 Stream #0:1 -> #0:1 (copy)
Device setup failed for decoder on input stream #0:0 : Cannot allocate memory

Also could this be part of the problem?

Code

libreelec:~/ # dtoverlay rpivid-v4l2
DTOVERLAY[error]: overlay 'rpivid-v4l2' is deprecated: no longer necessary
* Failed to load 'rpivid-v4l2'

**HiassofT** · September 10, 2024 at 3:58 PM Best Answer

ffmpeg from the ffmpeg-tools-addon is built from plain upstream source without any RPi patches, so you won't get hardware acceleration on RPi with it.

Getting rid of the separate ffmpeg build and shipping a ffmpeg binary in the image (which will then have all patches, like in kodi) is on my TODO list but I didn't find the time to dig into this yet.

so long,

Hias

libretimebandit · September 10, 2024 at 8:46 PM

Thanks HiassofT - One suggestion I think would powerful addition to LibreELEC, if HEVC hardware decoding support for RPI4b could be added into Jellyfin server addon.

Kodi+Jellycon+Jellyfin+HEVC would be quite the homerun for the RPI4b platform.