Latest kernel trees: hevc: Failed to find a V4L2 device for H265

[Dark-Sky]

Describe the bug

With the very latest kernel trees I am unable to do V4L2 H265 HW decoding using ffmpeg built from jc-kynesim's fork.

Steps to reproduce the behaviour

Example v6.12.18 does not work but v6.12.17 does.

Device (s)

Raspberry Pi 5

System

[ray@jellyfin ~]$ sudo vcgencmd version
2025/02/12 10:51:52
Copyright (c) 2012 Broadcom
version f788aab6 (release) (embedded)

[ray@jellyfin ~]$ uname -a
Linux jellyfin 6.12.18-1-MANJARO-RPI5 #1 SMP PREEMPT Mon Mar 10 15:04:45 UTC 2025 aarch64 GNU/Linux

Mesa: 24.3.4-1 and 25.0.1

Logs

[ray@jellyfin ~]$ mpv --profile=fast --hwdec=auto-safe ./127w_nasa_uhd_02042022.ts
[ffmpeg/video] hevc: PPS id out of range: 0
[ffmpeg/video] hevc: Skipping invalid undecodable NALU: 39
[ffmpeg/video] hevc: PPS id out of range: 0
[ffmpeg/video] hevc: Skipping invalid undecodable NALU: 9
[ffmpeg/video] hevc: PPS id out of range: 0
repeats several times.....

● Video --vid=1 (hevc 3840x2160 59.9401 fps)
● Audio --aid=1 --alang=eng (mp2 2ch 48000 Hz 128 kbps)
○ Audio --aid=2 --alang=eng (aac 2ch 48000 Hz 129 kbps)
[ffmpeg/video] hevc: Failed to find a V4L2 device for H265
[ffmpeg/video] hevc: Failed setup for format drm_prime: hwaccel initialisation returned error.
[ffmpeg/video] hevc: Could not find ref with POC -15067
[ffmpeg/video] hevc: Could not find ref with POC -15059
[ffmpeg/video] hevc: Device does not support the VK_KHR_video_decode_queue extension!
[ffmpeg/video] hevc: Failed setup for format vulkan: hwaccel initialisation returned error.
[ffmpeg/video] hevc: Could not find ref with POC -15067
[ffmpeg/video] hevc: Could not find ref with POC -15059
AO: [pipewire] 48000Hz stereo 2ch s16p
[ffmpeg/video] hevc: Failed to find a V4L2 device for H265
[ffmpeg/video] hevc: Failed setup for format drm_prime: hwaccel initialisation returned error.
● Video --vid=1 (hevc [Main 10] 3840x2160 59.9401 fps)
● Audio --aid=1 --alang=eng (mp2 2ch 48000 Hz 128 kbps)
○ Audio --aid=2 --alang=eng (aac 2ch 48000 Hz 129 kbps)
○ Subs --sid=1 (eia_608) [default]
VO: [gpu] 3840x2160 yuv420p10

Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).
Consider trying --profile=fast and/or --hwdec=auto-safe as they may help.

AV: 00:00:01 / 00:02:03 (1%) A-V: 1.309 Dropped: 22

Additional context

If I had to guess there is also an issue with the pi4 also as someone posted this on the arch-arm forums although I have no issue with v6.12.17:

https://archlinuxarm.org/forum/viewtopic.php?f=65&t=17222

[6by9]

Which of the branches from https://github.com/jc-kynesim/rpi-ffmpeg/ are you building?

#6666
We won't be reverting the kernel change as it brings us closer to how it will be once merged to mainline, so your FFmpeg needs to pick up the changes to match.

[Dark-Sky]

Which of the branches from https://github.com/jc-kynesim/rpi-ffmpeg/ are you building?

https://github.com/jc-kynesim/rpi-ffmpeg/tree/dev/7.1/rpi_import_2

[6by9]

@jc-kynesim which are the current branches on rpi-ffmpeg?
dev/7.1/rpi_import_2 does appear to be the default branch, but doesn't have the patches.

[Dark-Sky]

What patches does it need?

[popcornmix]

I think you need origin/test/7.1/main
Specifically "v4l2_req_hevc: Fix up for latest sand scheme"

[6by9]

The top two on https://github.com/jc-kynesim/rpi-ffmpeg/commits/test/7.1/main/
v4l2_req_hevc: Fix up for latest sand scheme
Revert "frame: Avoid any cropping if drmprime and sand might be fmt"

[jc-kynesim]

test/7.1/main should be good.

…

On Thu, 13 Mar 2025 at 12:35, Ray Sherwin ***@***.***> wrote: What patches does it need? — Reply to this email directly, view it on GitHub <#6718 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADV4O4KMAWU2KQ3CXRPCOMD2UF3Q3AVCNFSM6AAAAABY6ATW62VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMRRGEYDMNJWHA> . You are receiving this because you were mentioned.Message ID: ***@***.***> [image: Dark-Sky]*Dark-Sky* left a comment (raspberrypi/linux#6718) <#6718 (comment)> What patches does it need? — Reply to this email directly, view it on GitHub <#6718 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADV4O4KMAWU2KQ3CXRPCOMD2UF3Q3AVCNFSM6AAAAABY6ATW62VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDOMRRGEYDMNJWHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[Dark-Sky]

Switched to test/7.1/main. All good now. Thanks everyone!!

Using hardware decoding (drm).
● Video  --vid=1               (hevc [Main 10] 3840x2160 59.9401 fps)
● Audio  --aid=1  --alang=eng  (mp2 2ch 48000 Hz 128 kbps)
○ Audio  --aid=2  --alang=eng  (aac 2ch 48000 Hz 129 kbps)
○ Subs   --sid=1               (eia_608) [default]
VO: [gpu] 3840x2160 drm_prime[rpi4_10]
AV: 00:00:28 / 00:02:03 (23%) A-V:  0.000 Dropped: 1