[FFmpeg-user] Failed creating CUDA context for NVENC

[Yugandhar Veeramachaneni]

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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