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

  1er septembre 2019, par 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.
  

• C++ code for ffmpeg terminal command [on hold]

  17 janvier 2018, par KingWealth

  Platform - Linux
  I created a v4l2loopback device by following the guide.
  The following terminal command is used to write the video testsrc.avi into the loopback device /dev/video1
  

  ffmpeg -re -i testsrc.avi -f v4l2 /dev/video1 

  Now the question is, I want the c++ code for the above mentioned to terminal comment.

  Note - c++ code for -f v4l2 /dev/video1 is enough too.

  The actual program and logic is really long and irrelevant to explain.
  The problem is, i want to write ffmpeg avframes into the loopback device but using fwrite is giving disturbed output.

• I would make the fadeout this code go to the volume 0.1 is possible

  18 décembre 2015, par wildson

  I would make the fadeout this code go to the volume 0.1 is possible ?

  exec("ffmpeg -i audio.mp3 -af 'afade=t=out:st=30:d=5' out.mp3");