[FFmpeg-user] Failed creating CUDA context for NVENC

Yugandhar Veeramachaneni hello at yugandhar.me
Wed Jul 18 22:51:15 EEST 2018 

I see unrestricted in the # of concurrent sessions column -
https://screenshots.firefox.com/ZTBoEcMVKO336dh8/developer.nvidia.com which
is why I bought this GPU in the first place.

Your solution to override the hard-coded limits seems promising at the
first glance. I'll try that soon and report back my findings.

Thank you for your help.

- Yugandhar

On Wed, Jul 18, 2018 at 2:46 PM Dennis Mungai <dmngaie at gmail.com> wrote:

> Also, see this list:
> https://developer.nvidia.com/video-encode-decode-gpu-support-matrix
>
> You have the Quadro P4000, which is artificially crippled to ~2 concurrent
> sessions according to the documentation above.
>
> On 18 July 2018 at 22:34, Dennis Mungai <dmngaie at gmail.com> wrote:
>
> > NVENC runs on a discrete silicon IP core (SIP) block in the GPU, and not
> > on the GPU's shaders.
> > That SIP block has hard-coded limits (set in firmware) to ensure that
> > these who need more than the artificial limit buy Tesla-grade hardware.
> >
> > Marketing shills by NVIDIA.
> >
> > You can override this limit by using Keylase's nvidia patcher here:
> > https://github.com/keylase/nvidia-patch
> >
> > On 18 July 2018 at 22:00, Yugandhar Veeramachaneni <hello at yugandhar.me>
> > wrote:
> >
> >> I'm a little confused here because the GPU resource utilization is well
> >> below the hard limits.
> >>
> >> When I run nvidia-smi, this is what I get -
> >>
> >> yugandharv at eclairs:~$ nvidia-smi
> >> Thu Jul 19 00:29:45 2018
> >> +-----------------------------------------------------------
> >> ------------------+
> >> | NVIDIA-SMI 390.67                 Driver Version:
> >> 390.67                    |
> >> |-------------------------------+----------------------+----
> >> ------------------+
> >> | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile
> Uncorr.
> >> ECC |
> >> | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util
> Compute
> >> M. |
> >> |===============================+======================+====
> >> ==================|
> >> |   0  Quadro P4000        Off  | 00000000:02:00.0 Off |
> >> N/A |
> >> | 52%   55C    P0    38W / 105W |   6646MiB /  8117MiB |     25%
> >> Default |
> >> +-------------------------------+----------------------+----
> >> ------------------+
> >>
> >>
> >> +-----------------------------------------------------------
> >> ------------------+
> >> | Processes:                                                       GPU
> >> Memory |
> >> |  GPU       PID   Type   Process name
> >> Usage      |
> >> |===========================================================
> >> ==================|
> >> |    0       983      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0       995      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0      1010      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0      1012      C   /home/yugandharv/bin/ffmpeg
> >> 215MiB |
> >> |    0      1017      C   /home/yugandharv/bin/ffmpeg
> >> 235MiB |
> >> |    0      1986      C   /home/yugandharv/bin/ffmpeg
> >> 224MiB |
> >> |    0      8484      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0      8497      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0      8538      C   /home/yugandharv/bin/ffmpeg
> >> 225MiB |
> >> |    0     11097      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     11109      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     11121      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     11134      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11169      C   /home/yugandharv/bin/ffmpeg
> >> 225MiB |
> >> |    0     11175      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     11186      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11195      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11207      C   /home/yugandharv/bin/ffmpeg
> >> 224MiB |
> >> |    0     11222      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11226      C   /home/yugandharv/bin/ffmpeg
> >> 225MiB |
> >> |    0     11231      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11234      C   /home/yugandharv/bin/ffmpeg
> >> 225MiB |
> >> |    0     11235      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11237      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11240      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11252      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     11300      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> |    0     13264      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     14176      C   /home/yugandharv/bin/ffmpeg
> >> 193MiB |
> >> |    0     30258      C   /home/yugandharv/bin/ffmpeg
> >> 229MiB |
> >> +-----------------------------------------------------------
> >> ------------------+
> >>
> >>
> >> Thanks,
> >>
> >> Yugandhar
> >>
> >> On Wed, Jul 18, 2018 at 11:55 AM Dennis Mungai <dmngaie at gmail.com>
> wrote:
> >>
> >> > You mentioned 30 streams. And more cause this to "fail".
> >> >
> >> > Perhaps the Quadro line has a maximum simultaneous encoder limit of
> 30,
> >> > similar to the GeForce's limit of 2?
> >> >
> >> > On Wed, Jul 18, 2018, 19:28 Yugandhar Veeramachaneni <
> >> hello at yugandhar.me>
> >> > wrote:
> >> >
> >> > > Hello everyone,
> >> > >
> >> > > I'm currently using an NVIDIA Quadro P4000 GPU to transcode
> multicast
> >> UDP
> >> > > streams to RTMP streams. I have quite about 30 streams running in
> >> > parallel
> >> > > on this GPU and I have no problems so far. I tried adding more today
> >> and
> >> > > many of them are failing with this error.
> >> > >
> >> > > [h264_nvenc @ 0x55ef24458040] Loaded Nvenc version 8.1
> >> > > [h264_nvenc @ 0x55ef24458040] Nvenc initialized successfully
> >> > > [h264_nvenc @ 0x55ef24458040] 1 CUDA capable devices found
> >> > > [h264_nvenc @ 0x55ef24458040] [ GPU #0 - < Quadro P4000 > has
> Compute
> >> SM
> >> > > 6.1 ]
> >> > > [h264_nvenc @ 0x55ef24458040] Failed creating CUDA context for
> NVENC:
> >> 0x2
> >> > > [h264_nvenc @ 0x55ef24458040] No NVENC capable devices found
> >> > > [h264_nvenc @ 0x55ef24458040] Nvenc unloaded
> >> > >
> >> > > Full log is pasted at
> >> > >
> https://gist.github.com/yugandhar91/47a1c30482d1e89a47f7b6fb6dd420ca
> >> > >
> >> > > Can you please point me to my mistake?
> >> > >
> >> > > Thanks,
> >> > >
> >> > > Yugandhar
> >> > > _______________________________________________
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