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NVIDIA Quadro P5000 encoding in linux working on GPU but also using CPU


I have NVIDIA Quadro K5000 running on Ubuntu Server 18.04.

Transcoder is configured to encode 3 bitrates 1080p, 720p and 320p using “NVENC”.

With “nvidia-smi” command i can see Wowza running process on GPU, so the GPU is transcoding but also the CPU is increase up (around 90% with 8 incoming streams).

When i change the transcoder to use “Default” encoding instead “NVENC”, “nvidia-smi” command showing GPU does not use the any Wowza process, so transcoding using just CPU (95% with 2 incoming streams).

Any solutions?

Dependent on your CPU, it may be that it simply is running at max capacity even with all the right settings. You can compare your configuration against

There are 3 places where you can decide to use CPU or GPU:

  • Decoding (in the template XML under Root/Decode/Video/Implementation)

  • Each encoding profile (Root/Encodes/Encode/Video/Implementation)

  • Scaling (Root/Scale/Implementation)

Also, make sure the K5000 supports the codec that you want to de-/encode (see

Please run the following command which will show everything that your Nvidia cards are doing.
nvidia-smi -i 0 -q

You should see a section that looks as follows:

        Gpu                         : 46 %
        Memory                      : 27 %
        Encoder                     : 0 %
        Decoder                     : 0 %
    Encoder Stats
        Active Sessions             : 0

It is likely that your decoder and/or encoder is overloaded.

Thank you for reply,

I change value in XML file to “NVENC” instead “default”.
Now CPU usage is better than before, now Wowza transcoding 20 rdp streams to 3 bitrates (1080p, 720p, 360p),
My machine CPU: Intel® Core™ i7-8700K CPU @ 3.70GHz, CPU usage: 80%.


GPU usage: 1855MiB / 16275MiB

How many streams i can transcode with this machine?

Are this configuration is correct because GPU is used only 1855MiB/16275MiB ?

Thank you for replay,

I run this command, following results are from this command:

GPU command:nvidia-smi -i 0 -q

    FB Memory Usage
        Total                       : 16275 MiB
        Used                        : 1849 MiB
        Free                        : 14426 MiB

        Gpu                         : 64 %
        Memory                      : 4 %
        Encoder                     : 22 %
        Decoder                     : 41 %

Wowza transcoding 20 RDP input streams to 3 bitrates ( 1080p, 720p, 360p ).

On this machine CPU is : “Intel® Core™ i7-8700K CPU @ 3.70GHz” CPU usage on is: 80%