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

  24 mai 2021, par MorenoGentili

  I'm using ffmpeg from the command line on Windows 10 and I wanted to gave GPU acceleration 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-GPU 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 GPU-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 GPU acceleration ? 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 ?

  


• ffmpeg how modify the contrast with nvidia "hevc_nvenc" codec

  12 juin 2021, par Marco999

  I need to adjust to contrast of some mkv file I have tried this code :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i title00.mkv  -c:v hevc_nvenc -b:v 5M  -vf eq=contrast=1.0   output.mkv


  


  but 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


  


  If I run the some line without "-vf eq=contrast=1.0" :

  


  ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -i title00.mkv  -c:v hevc_nvenc -b:v 5M    output.mkv


  


  the command work and don't show any error message but don't allow me to adjust the contrast.

  


  There is a way to modify the contrast with nvidia hevc_nvenc codec ?

  


• FFMPEG in Bash - Too many inputs specified for the "movie" filter

  15 juin 2021, par Rodion Grinberg

  Basically, I am doing a script to automate video watermarking, border insert, and noise adding.

  


  When I use the following combination :

  


  ffmpeg -y -i "$INPUT" -vf "noise=alls=$NOISE_INDEX:allf=t , movie=$WATERMARK [watermark]; [in]scale=512:trunc(ow/a/2)*2 [scale]; [scale][watermark] overlay=$OVERLAY_SETTINGS_WATERMARK [out] , drawtext=text=$TEXT:$OVERLAY_SETTINGS_TEXT:fontsize=32:fontcolor=black:box=1:boxcolor=white@1: boxborderw=5 , pad=iw+50:ih+50:iw/8:ih/8:color=red" $OUTPUT


  


  ...it shows the following error :

  


  Too many inputs specified for the "movie" filter.
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument


  


  Can someone help me with that ?