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• Automator Service to Run Bash Script to Convert Video

  1er mars 2017, par mike varela

  I’m having the hardest time understanding variables in automator. In essence, I’m attempting to right click on a file and perform a bash script that I write. The issue I have is the bash script takes an input filename and output filename and ideally I want them to be the same, except for the output to be appended with something to indicate it’s converted.

  I’m using FFMBC (a derivative of FFMPEG)

  my script is

  ffmbc -i input.mov -vcodec prores -profile proxy -pix_fmt yuv422p10le -acodec pcm_s24le output.mov

  I’d like to change the output.mov to filename-proxy.mov

  So frustrated at the moment.

• Repeating video frame sequences without iterating each frame

  4 juillet 2015, par Raheel Khan

  I have an application that generates a video from a given number of files. A total frame count and sequence is provided and the generated video should loop the given sequence until the total number of frames have been written.

  At the moment, I’m using FFMPEG.VideoFileWriter from AForge.

  var frameIndex = 0;
  
  var frameCount = 300;
  
  
  
  var writer = new AForge.Video.FFMPEG.VideoFileWriter();
  
  writer.Open(filename: "Video.mp4", width: 10000, height: 10000, fps: 30, code: VideoCodec.MPEG4, bitrate: 1024 * 1024 * 2);
  
  
  
  using (var imageCanvas = new Bitmap(width, height))
  
  {
  
      do
  
      {
  
          foreach (var file in this._Files)
  
          {
  
              frameIndex++;
  
              if (frameIndex > frameCount) { break; }
  
  
  
              using (var graphicsCanvas = Graphics.FromImage(imageCanvas))
  
              {
  
                  graphicsCanvas.Clear(Color.Black);
  
  
  
                  using (var imageFile = Image.FromFile(file.FullName))
  
                  {
  
                      graphicsCanvas.DrawImage(imageFile, 0, 0, imageCanvas.Width, imageCanvas.Height);
  
                  }
  
              }
  
  
  
              writer.WriteVideoFrame(imageCanvas);
  
          }
  
      }
  
      while (true);
  
  }

  the bottlenecks are :

  • The call to writer.WriteVideoFrame(imageCanvas).
  • The source images in question are massive (more than 10Kx10K 32bpp) so keeping them all in memory is not an option.

  The only thing I can think of is to create an uncompressed AVI file and somehow copy entire sequences in bulk. although transcoding back to MP4 would still take a while, it may same some overall.

  Any general optimization suggestions or clues on how to write multiple frames at once would be appreciated.

• Http server live streaming in python

  8 juillet 2015, par George Subi

  I want to send the live output of ffmpeg command to every GET request, but I’m novice in python and can’t solve it. This is my code :

  import subprocess # for piping
  
  from http.server import HTTPServer, BaseHTTPRequestHandler
  
  
  
  class RequestHandler(BaseHTTPRequestHandler):
  
  
  
      def _writeheaders(self):
  
          self.send_response(200) # 200 OK http response
  
          self.send_header('Connection', 'keep-alive')
  
          self.send_header('Content-Type', 'video/mp4')
  
          self.send_header('Accept-Ranges', 'bytes')
  
          self.end_headers()
  
  
  
      def do_GET(self):
  
          self._writeheaders()
  
          global p
  
          DataChunkSize = 10000
  
  
  
          print("starting polling loop.")
  
          while(p.poll() is None):
  
              print("looping... ")
  
              stdoutdata = p.stdout.read(DataChunkSize)
  
              self.wfile.write(stdoutdata)
  
  
  
          print("Done Looping")
  
  
  
          print("dumping last data, if any")
  
          stdoutdata = p.stdout.read(DataChunkSize)
  
          self.wfile.write(stdoutdata)
  
  
  
  if __name__ == '__main__':
  
      command = 'ffmpeg -re -i video.avi -an -vcodec libx264 -vb 448k -f mp4 -movflags dash -'
  
      print("running command: %s" % (command, ))
  
      p = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=-1, shell=True)
  
      print("Server in port 8080...")
  
      serveraddr = ('', 8080) # connect to port 8080
  
      srvr = HTTPServer(serveraddr, RequestHandler)
  
      srvr.serve_forever()

  This is a prove of concept with a video.avi but the real application is with a live signal video.

  When connect to html5 video tag, play the video well, but when open another connection then play the video from the begining and not from the live moment. Also, when close the web, the server print an error :

  BrokenPipeError: [Errno 32] Broken pipe

  Yes, the pipe is broken when cut the connection is obvious. I think that maybe do it with pipes is not correct, but I don’t know how to do it.

  The goal is to run only one ffmpeg command and the output send to every client connected or will do it. Anybody can help me please ?