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• What does matplotlib need to know about ffmpeg's installation

  8 décembre 2016, par fffred

  My installation of ffmpeg and matplotlib seem to be problematic :

  In [9]: matplotlib.animation.writers["ffmpeg"]
  
  ---------------------------------------------------------------------------
  
  RuntimeError                              Traceback (most recent call last)
  
   ........
  
       58     def __getitem__(self, name):
  
       59         if not self.avail:
  
  ---> 60             raise RuntimeError("No MovieWriters available!")
  
       61         return self.avail[name]
  
       62 
  
  
  
  RuntimeError: No MovieWriters available!

  It looks like ffmpeg (or any other writer) has not been found. However, I have built it from source and installed it in ~/.local. This is included in the $PATH, and I verified that the command ffmpeg is working from the terminal.

  Is there something I should watch out when installing ffmpeg ? Is there something else to do ?

  Config :

  • Python 2.7.3
  • matplotlib 1.2.0
  • ffmpeg N-82786-gc188f35
  • Red Hat 6.7

  Note : I would like to avoid re-installing everything from scratch. I do not have root access and the only thing I installed manually is ffmpeg.

• Bash : bash script to download trimmed mp3 from youtube url

  23 février 2017, par Bhishan Poudel

  I would like to download the initially x seconds trimmed mp3 from a video url of youtube.
  I found that youtube-dl can download the video from youtube to local machine. But, when I looked at the man pages of youtube-dl, I could not find any trim options.

  So I tried to use the ffmpeg to trim downloaded mp3 file.
  Instead of doing this is two steps, I like to write one bash script which does the same thing.
  My attempt is given below.

  However, I was stuck at one place :
  "HOW TO GET THE VARIABLE NAME OF OUTPUT MP3 FILE FROM YOUTUBE-DL ?"
  The script is given below :

  # trim initial x seconds of mp3 file
  
  # e.g. mytrim https://www.youtube.com/watch?v=dD5RgCf1hrI 30
  
  function mytrim() {
  
      youtube-dl --extract-audio --embed-thumbnail --audio-format mp3 -o "%(title)s.%(ext)s" $1
  
      ffmpeg -ss $2 -i $OUTPUT_MP3 -acodec copy -y temp.mp3
  
      mv temp.mp3 $OUTPUT_MP3
  
      }

  How to get the variable value $OUTPUT_MP3 ?
  echo "%(title)s.%(ext)s" gives the verbatim output, does not give the output filename.

  How could we make the script work ?

  The help will be appreciated.

• Getting ffprobe or avprobe not found while using youtube_dl module

  26 décembre 2016, par Avinash

  import youtube_dl
  
  
  
  
  
  options = {
  
      'format':'bestaudio/best',
  
      'extractaudio':True,
  
      'audioformat': 'mp3',
  
      'outtmpl':'%(id)s.%(ext)s',
  
      'noplaylist':True,
  
      'nocheckcertificate':True,
  
      'postprocessors': [{
  
          'key': 'FFmpegExtractAudio',
  
          'preferredcodec': 'mp3',
  
          'preferredquality': '192',
  
      }],
  
  
  
  }
  
  
  
  with youtube_dl.YoutubeDL(options) as ydl:
  
      ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])

  I am Getting

  "youtube_dl.utils.DownloadError : ERROR : ffprobe or avprobe not found.
  Please install one."

  I downloaded ffmpeg and tried giving its bin folder location in path variable . I also tried copying that bin folder to my youtube_dl package folder. None of them worked.

  Thanks in advance.