Recherche avancée

Sur d’autres sites (5188)

• 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 : "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.

  


• ffmpeg video cropping "unable to parse option value "" as boolean"

  27 novembre 2018, par Lisa Mitchem

  I am trying to crop .mp4 videos to a specific size using this code :

  ffmpeg -i INPUT.mp4 -filter:v "crop=900:1000:800:300” OUTPUT.mp4

  However, even when I change the crop values, I get this error every time :

  [crop @ 0x7f974e8441c0] Unable to parse option value "1000" as boolean
  
  [crop @ 0x7f974e8441c0] Unable to parse option value "800" as boolean
  
  [Parsed_crop_0 @ 0x7f974e8440c0] No option name near '300”'
  
  [AVFilterGraph @ 0x7f974e843dc0] Error initializing filter 'crop' with 
  
  args '900:1000:800:300” out2.mp4
  
  ffmpeg -i INPUT.mp4 -vf crop=900:1000:800:300”'
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0