[FFmpeg-trac] #7530(avcodec:new): cuviddec/nvdec/nvenc: driver checking errors

FFmpeg trac at avcodec.org
Fri Nov 2 14:22:45 EET 2018

#7530: cuviddec/nvdec/nvenc: driver checking errors
             Reporter:  msiders      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avcodec      |                  Version:  git-
             Keywords:  cuviddec,    |  master
  nvdec, nvenc                       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:

 When executing the FFmpeg tool with an ancient NVidia driver, the output
 ins't clear about the incompatibility of the driver.

 This is the regular output when this error appears:
 [AVHWDeviceContext @ 0x1f2d000] Loaded lib: libcuda.so.1
 [AVHWDeviceContext @ 0x1f2d000] Loaded sym: cuInit
 [AVHWDeviceContext @ 0x1f2d000] Loaded sym: cuDeviceGetCount
 [AVHWDeviceContext @ 0x1f2d000] Loaded sym: cuDeviceGet
 [AVHWDeviceContext @ 0x1f2d000] Loaded sym: cuDeviceGetName
 [AVHWDeviceContext @ 0x1f2d000] Cannot load cuDeviceGetUuid
 [AVHWDeviceContext @ 0x1f2d000] Could not dynamically load CUDA
 [h264_cuvid @ 0x1eec3c0] Error creating a CUDA device

 Take note that the driver is installed and the card is working. However,
 when using a ''recent'' version of FFmpeg, in this case the error
 appears... as the driver version is too old. So, ''no errors at all'' when
 using a previous version of FFmpeg.

 Here are the three points where the driver version is checked:

 First of all, the function to check the driver version should be
 centralized (perhaps in "hwcontext_cuda.c"). And second, the function
 needs to log every time the minimum version required and the current
 version. This will help the user to identificate the problem.

 I hope you can fix this soon.

Ticket URL: <https://trac.ffmpeg.org/ticket/7530>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker

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