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• ffmpeg : "Impossible to convert between the formats" when using Cuda hardware acceleration

  21 août 2020, par MorenoGentili

  I'm using ffmpeg from the command line on Windows 10 and I wanted to gave Cuda a try to improve execution times. A simple cut command like this works fine and its execution time is reduced by 60-70%. Awesome.

  



  ffmpeg -hwaccel cuvid -c:v h264_cuvid -ss 00:00:10 -i in.mp4 -c:v h264_nvenc out.mp4


  



  Now I tried to use the -filter_complex flag to overlay, fade and translate a png image over a video. The working non-cuda enhanced command is this one :

  



  ffmpeg -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), (t-30)*10, NAN)'" -movflags +faststart out.mp4


  



  Then, I added the cuda-related flags to the command like this.

  



  ffmpeg -hwaccel cuvid -c:v h264_cuvid -i in.mp4 -loop 1 -t 75 -i overlay.png -filter_complex "[1:v]fade=t=in:st=30:d=0.3:alpha=1,fade=t=out:st=35.7:d=0.3:alpha=1[png1];[0:v][png1]overlay=x='if(gte(t,30), 60-tanh((t-30)*30/5)*60, NAN)'" -movflags +faststart -c:v h264_nvenc out.mp4


  



  But it won't work. I get this error.

  



  Impossible to convert between the formats supported by the filter 'graph 0 input from stream 0:0' and the filter 'auto_scaler_0'
Error reinitializing filters!
Failed to inject frame into filter network: Function not implemented
Error while processing the decoded data for stream #0:0


  



  I don't even know what it means. Can I actually run ANY ffmpeg command on the GPU with Cuda ? I've found some information about the hwupload_cuda flag but I'm not sure if I should use it and how. My attempts have failed so far.
Any advice on how I should modify the command to make it work on the GPU ?
Thanks.

  


• qsv : Error out if getting session handle failed in avfilter

  15 août 2018, par Zhong Li

  qsv : Error out if getting session handle failed in avfilter
  Solve some issues found by an automated code scansion.
  
  Suppress the complain "variables ’handle’ is used but maybe
  
  uninitialized".
  Signed-off-by : Zhong Li <zhong.li@intel.com>
  
  Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavfilter/qsvvpp.c
  • [DBH] libavfilter/vf_deinterlace_qsv.c
  • [DBH] libavfilter/vf_scale_qsv.c

• FFMPEG hevc_nvenc "No NVENC capable devices found" with NVidia GTX950M

  5 juillet 2018, par NaturalBornCamper

  I get the error "No NVENC capable devices found" when trying a simple encoding like this, even skipping audio to make sure it’s not an audio problem :

  ffmpeg.exe -i input.mp4 -c:v hevc_nvenc -an out.mp4

  I also tried with more details, like setting the pixel format, the preset, the rate-control, the format.

  On the documentation page there :
  https://trac.ffmpeg.org/wiki/HWAccelIntro
  it says that if we get this error we should check for the pixel format. The video has yuv420p here and even specifying the format results in the same error.

  i also checked the NVidia supported cards and it says GeForce, but no details about the models :
  https://developer.nvidia.com/video-encode-decode-gpu-support-matrix#Encoder

  I tried h264_nvenc and it works perfectly however, the problem is only with hevc_nvenc
  Has anyone encountered this problem ?

  Complete console output :

  [h264 @ 0000000002534560] Reinit context to 1280x544, pix_fmt: yuv420p
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isom
  
      creation_time   : 2014-05-23T13:04:15.000000Z
  
    Duration: 01:54:03.95, start: 0.000000, bitrate: 3193 kb/s
  
      Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 / 0x31637661), yuv420p(left), 1280x544 [SAR 1:1 DAR 40:17], 2750 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-05-23T11:25:27.000000Z
  
      Stream #0:1(spa): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 439 kb/s (default)
  
      Metadata:
  
        creation_time   : 2014-05-23T12:56:43.000000Z
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
  
  Press [q] to stop, [?] for help
  
  [h264 @ 000000000260ea40] Reinit context to 1280x544, pix_fmt: yuv420p
  
  [graph 0 input from stream 0:0 @ 0000000003857ec0] w:1280 h:544 pixfmt:yuv420p tb:1/24000 fr:24000/1001 sar:1/1 sws_param:flags=2
  
  [hevc_nvenc @ 00000000038574e0] Loaded Nvenc version 8.0
  
  [hevc_nvenc @ 00000000038574e0] Nvenc initialized successfully
  
  [hevc_nvenc @ 00000000038574e0] 1 CUDA capable devices found
  
  [hevc_nvenc @ 00000000038574e0] [ GPU #0 - < GeForce GTX 950M > has Compute SM 5.0 ]
  
  [hevc_nvenc @ 00000000038574e0] Codec not supported
  
  [hevc_nvenc @ 00000000038574e0] No NVENC capable devices found
  
  [hevc_nvenc @ 00000000038574e0] Nvenc unloaded
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!