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• Popen set env parameter escape | character

  19 janvier 2016, par speedyrazor

  I had a working command which would set the env parameter FFREPORT for ffmpeg, this was working fine. Example here :

  command = 'ffmpeg -i input.mov -c:v prores -an output.mov -report'
  
  
  
  startupinfo = subprocess.STARTUPINFO()
  
  startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
  
  environ1 = os.environ.copy()
  
  environ1['FFREPORT'] = 'level=32:file={}'.format(ffmpeglogFilePath)
  
  process1 = Popen(command, startupinfo=startupinfo, env=environ1)

  But now I need to pipe VSPipe (Vapoursynth script) into ffmpeg but still keep the env parameter. Since adding in the | chracter it is no longer working, stderr output below. Here is what I have :

  command = 'vspipe --y4m input.vpy - | ffmpeg -f yuv4mpegpipe -i - -c:v prores -an output.mov -report'
  
  
  
  startupinfo = subprocess.STARTUPINFO()
  
  startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
  
  environ1 = os.environ.copy()
  
  environ1['FFREPORT'] = 'level=32:file={}'.format(ffmpeglogFilePath)
  
  process1 = Popen(command, startupinfo=startupinfo, env=environ1)

  This runs fine form the command line :

  set FFREPORT=file=C\:\\TEMP\\status.log && VSPipe.exe --y4m input.vpy - | ffmpeg.exe -f yuv4mpegpipe -i - -c:v prores -an output.mov -report

  Do I need to escape anything ?

  UPDATE :
  stderr gives me Unknown argument: |

  ANOTHER UPDATE :
  This command runs fine, what can I do to make my original command work :

  command = 'vspipe --y4m input.vpy - | ffmpeg -f yuv4mpegpipe -i - -c:v prores -an output.mov -report'
  
  
  
  process1 = Popen(command, shell=True)

• Anomalie #4725 : SyntaxError : JSon.parse : unexpected character at line 1 column 1 of the JSON data

  12 avril 2021, par b b

  Puis, j’ai ajouter le fichier "mes_options" avec tout dedans

  Avec tout quoi ? Donne nous le contenu de ce fichier, ça aidera un peu :p

• Can I capture a series of images named according to it's timestamp

  26 juillet 2015, par GDP

  I am successfully capturing a screen shot every 15 seconds with the below command, but I need to correlate the images to where in the video the screen shot is from.

  The %d gives me an integer, but is there a similar variable to include the timestamp of the image in the output file name ?

  c:\ffmpeg\bin>ffmpeg -i c:\files\video.mp4 -vf fps=1/15 c:\images\image_%d.png";

  Current output is :

     c:\images\image1.png
   c:\images\image2.png
   c:\images\image3.png
   ....
   c:\images\image999.png

  Desired output is something like :

     c:\images\image_00-00-00.png    // Capture at start of video
   c:\images\image_00-00-15.png    // Capture at 00:00:15
   c:\images\image_00-00-30.png    // Capture at 00:00:30
   c:\images\image_00-00-45.png    // Capture at 00:00:45
   c:\images\image_00-01-00.png    // Capture at 00:01:00
   ....
   c:\images\image_01-25-15.png    // Last capture