Mailinglist Archive: opensuse-factory (421 mails)

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Re: [opensuse-factory] CUDA on Tumbleweed and HEVC/H.265 decoding
  • From: Martin Herkt <lachs0r@xxxxxxxxxxx>
  • Date: Thu, 14 Sep 2017 20:27:20 +0200
  • Message-id: <1699813.DRkY6DSuXe@sakuya>
On 2017 M09 14, Thu 17:20:22 CEST Bjoern Voigt wrote:
Is there a way to install Nvidia CUDA on Tumbleweed?

(The official download site
lists only openSUSE 13.2, SLES 11 SP4 and 2. On there are unofficial
packages from the Bumblebeed project. I have a Nvidia Geforce GTX 750,
which supports H.264, but not H.265 over VDPAU.)

I tried the openSUSE 13.2 packages. They install, but it seems, that
they do not work.

$ mpv --hwdec=cuda hevc-testvideo.ts
(+) Video --vid=1 (hevc 1920x1080 50.000fps)
(+) Audio --aid=1 --alang=deu (aac_latm 6ch 48000Hz)
Audio --aid=2 --alang=fra (aac_latm 2ch 48000Hz)
Subs --sid=1 --slang=deu,deu,fra (dvb_teletext)
[ffmpeg/video] hevc_cuvid: ctx->cvdl->cuvidCreateDecoder(&cudec,
&cuinfo) failed -> CUDA_ERROR_NO_DEVICE: no CUDA-capable device is detected
Could not open codec.
[ffmpeg/video] hevc: Could not find ref with POC 21386
AO: [pulse] 48000Hz 5.1 6ch float
VO: [opengl] 1920x1080 yuv420p
AV: 00:00:02 / 01:17:57 (0%) A-V: 0.000


Sounds like a permission issue. Make sure the nvidia-uvm module is loaded and
your user is a member of the video group. Note: the GTX 750 will not support
HEVC via CUDA either. GTX 750 SE (which is a newer model) does.
It won’t work if vdpauinfo doesn’t show at least the HEVC_MAIN capability.
CUDA only adds is 10-bit support.

You don’t need to install the CUDA SDK to use the CUVID functionality that is
needed for hardware decoding.

Also, CUDA has known bugs. 10-bit decoding is broken in various ways (don’t
expect Rec. 2020/HDR to work) and even 8-bit will not always decode correctly.
Expect frame corruption, flickering, random lines of garbage at the bottom of
the screen, and juddery playback because CUDA messes with the timestamps.
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