[FFmpeg-user] error "Failed to query nvenc max version", how to solve this bug?

[Dennis Mungai]

On Sat, 29 Jul 2023 at 17:12, will <graperio at 163.com> wrote:

> The error "Failed to query nvenc max version" occurs when using FFmpeg
> with NVIDIA GPU acceleration (hevc_nvenc) on Linux.
>
> Do you know how to solve this bug? Thank you very much.
>
> The following code is the FFmpeg code I entered, along with the output
> content.
> ffmpeg -ss 10:00 -i /www/wwwroot/pyffmpeg/videos/0/011.mp4 -t 20 -r 30
> -b:v 4M -an -vcodec hevc_nvenc -y /www/wwwroot/pyffmpeg/videos/post/999.mp4
> ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
>   built with gcc 8 (GCC)
>   configuration: --extra-cflags='-I/usr/local/cuda/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda/lib64 -ldl ' --pkg-config-flags=--static
> --enable-shared --enable-gpl --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc='nvcc=/usr/local/cuda-12.2/bin/nvcc'
>   WARNING: library configuration mismatch
>   avutil      configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   avcodec     configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   avformat    configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   avdevice    configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   avfilter    configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   swscale     configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   swresample  configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   postproc    configuration:
> --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC '
> --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl '
> --pkg-config-flags=--static --enable-shared --enable-gpl
> --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree
> --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
>   libavutil      58.  2.100 / 58.  2.100
>   libavcodec     60.  3.100 / 60.  3.100
>   libavformat    60.  3.100 / 60.  3.100
>   libavdevice    60.  1.100 / 60.  1.100
>   libavfilter     9.  3.100 /  9.  3.100
>   libswscale      7.  1.100 /  7.  1.100
>   libswresample   4. 10.100 /  4. 10.100
>   libpostproc    57.  1.100 / 57.  1.100
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> '/www/wwwroot/pyffmpeg/videos/0/011.mp4':
>   Metadata:
>     major_brand     : isom
>     minor_version   : 512
>     compatible_brands: isomiso2avc1mp41
>     encoder         : Lavf59.6.100
>   Duration: 00:17:48.83, start: 0.000000, bitrate: 4617 kb/s
>   Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661),
> yuv420p(tv, smpte170m/bt470bg/bt709, progressive), 1920x1080 [SAR 1:1 DAR
> 16:9], 4481 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
>     Metadata:
>       handler_name    : ISO Media file produced by Google Inc.
>       vendor_id       : [0][0][0][0]
>   Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
> stereo, fltp, 127 kb/s (default)
>     Metadata:
>       handler_name    : ISO Media file produced by Google Inc.
>       vendor_id       : [0][0][0][0]
> Stream mapping:
>   Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
> Press [q] to stop, [?] for help
> [hevc_nvenc @ 0x2a577790] Failed to query nvenc max version: unknown error
> (-756041696): (no details)
> Segmentation faul
>
> I have installed FFmpeg, NVIDIA GPU drivers, and SDK. It works fine
> without using GPU acceleration, but it throws an error when using GPU
> acceleration.
>


I suspect you're running this on an NVIDIA GRID vGPU solution.
I've added Philip Langdale and Timo to this thread for guidance on this
because to my knowledge (and I stand corrected if I'm wrong), FFmpeg's
NVENC runtime does not initialize on NVIDIA's GRID vGPU solution. Only the
CUDA and D3D11VA backends are supported for context creation, see
https://github.com/FFmpeg/FFmpeg/blob/master/libavcodec/nvenc.c#L77

Perhaps Philip or Timo can clarify on that further.

You may need to tear down the vGPU stuff you're running and run FFmpeg
directly on baremetal for that GPU.