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• Adding retry connection logic to ffmpeg(rtmp)

  16 octobre 2014, par gaurav

  I am trying to create a video mosaic using ffmpeg. My full command looks like this -

  ffmpeg -i rtmp://localhost:1935/live/output1 -i rtmp://localhost:1935/live/output2 -i rtmp://localhost:1935/live/output3 -i rtmp://localhost:1935/live/output4 -filter_complex "nullsrc=size=640x480 [base]; [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright]; [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft]; [3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright]; [base][upperleft] overlay=shortest=0 [tmp1]; [tmp1][upperright] overlay=shortest=0:x=320 [tmp2]; [tmp2][lowerleft] overlay=shortest=0:y=240 [tmp3]; [tmp3][lowerright] overlay=shortest=0:x=320:y=240"  -filter_complex amix=inputs=4:duration=longest  -c:a aac -strict -2 -ar 44100  -c:v libx264 -f flv rtmp://localhost:1935/live/myStream

  This works well as long as all 4 input streams are running. But say one of the stream drops for sometime and comes back online. The output continues to show this stream as stuck (paused). Because once the stream drops (AVERROR_EOF) ffmpeg stops trying to get more packets from the input stream. I have to restart the ffmpeg process to get back everything to work again.

  Is there a way to add a retry logic here which will tell ffmpeg to keep trying to process all input sources as long as process is alive ?

• ffmpeg in the use of libardrone by python

  13 mai 2016, par Chao Wang

  Recently I am trying to do a vision-based control using AR.drone 2.0. I meet a problem in the first step that is to import video seen from drone to my PC. I searched online and there is a library called libardrone. I tried to used it but when I do the first step that is to intialize. I wrote

  drone = libardrone.libardrone.ARDrone(True)

  The problem rises in the installation of ffmpeg. I actually installed and set ffmpeg\bin in my path, but I don’t know why it keeps jumping out this error

  The error turns out to be

  Traceback (most recent call last) :

  File "C:\Python27\dronetest.py", line 7, in <module>
  
      drone=libardrone.ARDrone(is_ar_drone_2=True,hd=True)
  
    File "C:\Python27\lib\site-packages\libardrone\libardrone.py", line 126, in __init__
  
      self.network_process = arnetwork.ARDroneNetworkProcess(com_pipe_other, is_ar_drone_2, self)
  
    File "C:\Python27\lib\site-packages\libardrone\arnetwork.py", line 45, in __init__
  
      self.ar2video = ar2video.ARVideo2(self._drone, libardrone.DEBUG)
  
    File "C:\Python27\lib\site-packages\libardrone\ar2video.py", line 37, in __init__
  
      self.h264 = h264decoder.H264Decoder(self, drone.image_shape)
  
    File "C:\Python27\lib\site-packages\libardrone\h264decoder.py", line 82, in __init__
  
      raise Exception("You need to install ffmpeg to be able to run ardrone")
  
  Exception: You need to install ffmpeg to be able to run ardrone
  
  </module>

  The related code in h264decoder.py is

   if (H264Decoder.which('ffmpeg') is None):
  
                      raise Exception("You need to install ffmpeg to be able to run ardrone")
  
  
  
  ....
  
  
  
  
  
  def which(program):
  
          def is_exe(fpath):
  
              return os.path.isfile(fpath) and os.access(fpath, os.X_OK)
  
  
  
          fpath, fname = os.path.split(program)
  
          if fpath:
  
              if is_exe(program):
  
                  return program
  
          else:
  
              for path in os.environ["PATH"].split(os.pathsep):
  
                  path = path.strip('"')
  
                  exe_file = os.path.join(path, program)
  
                  if is_exe(exe_file):
  
                      return exe_file
  
  
  
          return None

• Codec issue ? Mp4 video flashing during play via JW Player (and same issue with mac computer)

  19 décembre 2017, par janosdupai

  I have a linux based server online. It has Mp4 videos. I try to play these video with JW Player. I had any problems with them, but some files has the following problem : https://www.video.match-meeting.com/drive/5a350a6700bc4.mp4

  If I download this file to a windows computer, it plays without problem. Is that a codec problem with my server (and on my mac) ?