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• Python script than run another python script, ffmpeg2vmaf

  16 mai 2018, par Asusio

  I want to build a little API to use ffmpeg2vmaf to analyze videos that are made for the video streaming (DASH, HLS).

  I’m on Linux Ubuntu 16.04, I’m using python 3.

  My API can now concatenate the files into an MP4 file. To do it I’m using the library subprocess and the command cat.

  But when I want to use ffmpeg2vmaf it can’t find a library that ffmpeg2vmaf use.

  This is how I do :

  try:
  
      os.chdir("/home/USERNAME/VMAF/vmaf/")
  
      output_cmd = subprocess.check_output(["sudo ./ffmpeg2vmaf WIDTH HEIGHT \
  
                   '/home/alexis/video/ref.mp4' '/home/alexis/video/dist.mp4'\
  
                   >> '/home/alexis/analyze/analyze.txt'"], shell = True)
  
  except subprocess.CalledProcessError:
  
      print("Error")

  The error is :

  Traceback (most recent call last):
  
      File "./ffmpeg2vmaf", line 8, in <module>
  
          from vmaf.config import VmafConfig, DisplayConfig
  
  ImportError: No module named vmaf.config
  
  </module>

  But if I use the same command without python, in the terminal, it works.

  I have try to put my API in the same folder as "ffmpeg2vmaf" but it still doesn’t work.

  Thank you by advance

• Correcting the variable name in an ffmpeg subtitle script

  21 juin 2017, par Steven Foong

  I have 175 mp4 video files and subtitle files with the extension .ass. Unfortunately, my smart TV is not able to read those subtitles. I plan to burn (hardcode) the subtitles into the video.

  I use this command :

  ffmpeg -i orgvideo.mp4 -vf subtitles="subtitle.ass" newvideo.mp4     <br />

  It works. So I plan to use a bash script to automate the process.

  Everything in the script is working but the ffmpeg command line isn’t able to retrieve the subtitle variable.

  After googling around, I found that my file name has special character and space, that causes my script to fail. If the video file name and the subtitle file is simple, then the script should be no problem.

  This is my script :

  for f in *.mp4
  
  do
  
      new="${f%%.mp4} (CHT).mp4"
  
      subtitle="${f%%.mp4}.chi.ass"
  
      < /dev/null ffmpeg -i "$f" -vf subtitles="$subtitle" "$new"
  
  done

  The ffmpeg line is having problems reading the subtitle file variable. Can anyone help ?

• Powershell Script Exits Handbrake CLI

  23 décembre 2014, par Arnav Attri

  With the help of google, I workaround a Powershell script for handbrake automation. Now, the issue is when the source folder is empty the Powershell script exits.

  Here’s the scenario :

  1. I downloaded someone files - automated via RSS.
  2. They are placed in source folder.
  3. Powershell script works and encoding starts and successfully gets over.
  4. Now, when the encode is completed and in case of new download/file doesn’t arrive in the source folder, the script exits.

  Code is in PasteBin which has more comments but should be easy to infer what the script does

  $inputpath = "I:\S" 
  
  $outputpath = "I:\E"
  
  
  
  $movies = ls $inputpath
  
  
  
  foreach($movie in $movies){
  
      $name = $movie.basename
  
  
  
      if(!(test-path -path "$outputpath\$name.mkv")){
  
          C:\"Program Files"\handbrake\HandBrakeCLI.exe -i "$inputpath\$movie" -o "$outputpath\$name.mkv" `
  
          -e x264 -b 1000 -2 -T -a 1,1 -E mp3 -B 112 --mixdown stereo -f mkv --detelecine --decomb `
  
          --loose-anamorphic -m -x rc-lookahead=30:ref=4:bframes=3:me=umh:subme=9:analyse=none:deblock=1:0:0:8x8dct=1
  
      }
  
  }