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• Create thumbnails of sections of a torrent stream

  14 July 2015, by Ortixx

  I’m trying to create a little application in nodejs using the torrent-stream library to create thumbnails of a video without actually having to download the entire file. I was thinking of downloading only 10 parts, out of which I would extract an image, but then the encoding comes into play: without an I-frame I cannot extract an image out of the stream, and there is no way of me knowing where the I-frame is.

  So any ideas on how to do this? Basically I was hoping to create 10 tiny files which I could then open in ffmpeg in order to save a thumbnail (this would give me 10 thumbnails which is want I want). I’m just not sure how to handle the stream.

• How to create thumbnail about torrent without downloading video files? [on hold]

  1 September 2019, by tty78

  Most of time, torrent sites like RARBG/The Pirate Bay/KickAss would return many query results even through I have typed in many detailed keywords, which is not strange because there are many people upload it.

  So, when i want to watch/download a torrent movie, it’s better to check the video first to find out that:

  • is it a fake video
  • is the video watermarked
  • is there some AD in the video
  • is it 1980*1080 or 640*480 ??

  What i want to do is creating thumbnail of the videos without download them, so that i can save a lot of broadband, disk space and time.

  Now I can create thumbnail with a python tool - vcsi, but it depends on the video file stored in disk.
  In fact, vcsi get meta information with ffprobe and create thumbnail using ffmpeg.

  def probe_media(self, path):
  
      """Probe video file using ffprobe
  
      """
  
      ffprobe_command = [
  
          "ffprobe",
  
          "-v", "quiet",
  
          "-print_format", "json",
  
          "-show_format",
  
          "-show_streams",
  
          path
  
      ]
  
  
  
      try:
  
          output = subprocess.check_output(ffprobe_command)
  
          self.ffprobe_dict = json.loads(output.decode("utf-8"))
  
      except FileNotFoundError:
  
          error = "Could not find 'ffprobe' executable. Please make sure ffmpeg/ffprobe is installed and is in your PATH."
  
          error_exit(error)

  ffmpeg_command = [
  
          "ffmpeg",
  
          "-ss", skip_time,
  
          "-i", self.path,
  
          "-ss", skip_delay,
  
          "-vframes", "1",
  
          "-s", "%sx%s" % (width, height),
  
      ]

  WebTorrent may be a solution but it’s not good because I have a lot of torrent file to scan.
  I want to create thumbnail on a ubuntu VPS because it can run day and night, and i can post thumbnail under the torrent comments.
  Some key frame, resolution and duration are enough, maybe.
  

• Passing shell variables containing spaces as arguments

  29 October 2014, by Julian Delphiki

  I know there are many of these questions out there already, but my situation is unique enough that none of them have helped me thus far.

  I’m writing a script that will reformat my (poorly tagged) music library. It’s currently in the form of Music/Genre/Artist/Album/##-Title.wav.

  From the Music directory, I run my script1, which calls find -name "*.wav" -exec script2 {} ${other_args}. Script2 parses the path to variables, creates the appropriate output directory if it doesn’t exist, and then calls ffmpeg to do the compression.

  ex: ($sourcefilepath contains {} from find)

  ffmpeg -i "$sourcefilepath" "$path/$to/$outfile.$extension"

  If my file name or path contains no spaces, it works like a charm.

  If it contains spaces, ffmpeg fails, with the following error:

  Blues/Country Blues/Rhythm, Country And Blues/08-Natalie Cole & Reba
  McEntire Since I Fell For You.wav: No such file or directory

  Note: that’s the source file it can’t find. The output file appears to be working correctly, even with spaces. That’s not the full command I’m running (it has some -metadata flags too, but that also appears to be working correctly. I’m debugging with the command I wrote above).

  The interesting thing here is that ffmpeg is NOT interpreting $sourcefilepath as two args, it just can’t find the file I specified. Running the following from the Music directory works.

  ffmpeg -i Blues/Country\ Blues/Rhythm\,\ Country\ And\ Blues/08-Natalie\ Cole\ \&\ Reba\ McEntire\ \ \ Since\ I\ Fell\ For\ You.wav output.flac

  I’m kind of stuck here. The other information on the web involves getting a command to see a variable with a space as one arg instead of multiple. I appear to have done that, but ffmpeg can’t find my file now.

  Normally I’d just use find -name "*.wav" -exec ffmpeg -i {} ${args} \; but I need to process the file path to extract my metadata.

  I’m fairly new to shell scripting; does anybody know what’s going on here?