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• Piwik at Free and Open Source Software Conference

  26 août 2013, par thomas — Community

  Last weekend Fabian and Thomas from the Piwik team have represented Piwik at the 8th FrOSCon in St. Augustin (Germany, near Cologne).

  At our booth we handed out Piwik brochures, our new awesome Stickers, and of course sweets. Many Piwik users came by and we were glad to gather some interesting feature ideas and feedback. Thank you ! We also helped a few people troubleshoot issues on their servers and we introduced Piwik to many visitors stopping by the booth.

  We cannot put into words what the incredible FrOSCon team and all the people who helped have achieved. Thank you for making this conference possible ! We really enjoyed FrOSCon and we hope to be there next year again.

• Ffmpeg : alternating audio languages in resulting movie for language learning

  20 novembre 2020, par almachuar
  

  1. Need to convert multiple-(audio)-language-video to single-audio-stream-video where 2 languages alternate repeatedly.
(10sec Lang2) + (15sec Lang3) + (10sec Lang2) + (15sec Lang3) + ... and so on till the end.
I assume it should be done with piping in and changing audio streams. (I've read ffmpeg piping documentation but didn't quite understand it).

  


  


  I've done audio switching task (with scripting on Windows) by lively changing audio languages in video player but need better and crossplatform solution for little kid - preprepared video.

  


  

  2. If possible, to adjust loudness of one of the input audio streams to the other.

  


  


  P.S. Think it would be useful for many married (programmers) to show little kids bilingual cartoons. (To prepare for language learning). By balancing 10/15 sec you may retain kid's attention — the older they grow the more native language they demand.

  


  Irrelevant, just for what's my experience :
  
%ffmpeg% -y -f concat -safe 0 -i %playlist% -i %picture% -map:v 0 -map:v 1 -c:v copy -disposition:v:0 attached_pic -ac 1 -af aresample=resampler=soxr -ar 16000 -%title% -%album% -%artist% %lyrics% -c:a aac -q:a 1 %output%

  


• Gstreamer Multiple Source with Single Sink Implementation in PythonGST

  11 octobre 2018, par biswajitGhosh

  I’m new to Gstreamer as well as Python-GST also. I have to collect multiple source raw video stream data into a single sink, I don’t know, if it is possible or not.

  Lets explain more my scenario :

  I have 2 video source server for now, one is my webcam and another is just an mp4 file, I did open those source using following command

  Source1 :

  gst-launch-1.0 v4l2src device=/dev/video0 !
  ’video/x-raw,width=640,height=480’ ! x264enc pass=qual quantizer=20
  tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000

  Source2 :

  gst-launch-1.0 filesrc location = file_name.mp4 !
  ’video/x-raw,width=640,height=480’ ! x264enc pass=qual quantizer=20
  tune=zerolatency ! rtph264pay ! udpsink host=127.0.0.1 port=5000

  I’m trying to send both stream data to localhost 5000 port after encoding with H264.

  For receiving I have a Python Sink Server like this :

  import gi
  
  gi.require_version('Gst', '1.0')
  
  gi.require_version('GstApp', '1.0')
  
  from gi.repository import GObject, Gst, GstApp
  
  
  
  GObject.threads_init()
  
  Gst.init(None)
  
  GST_DEBUG="6"
  
  
  
  class Example:
  
      def __init__(self):
  
          self.mainloop   = GObject.MainLoop()
  
          self.pipeline   = Gst.Pipeline.new("Pipeline") 
  
          self.bus        = self.pipeline.get_bus()
  
          self.bus.add_signal_watch()
  
          self.bus.connect("message", self.on_message)
  
          # self.bus.connect('message::eos', self.on_eos)
  
          # self.bus.connect('message::error', self.on_error)
  
          # self.bus.connect("sync-message::element", self.on_sync_message)
  
  
  
          #Create QUEUE elements
  
          self.queue1     = Gst.ElementFactory.make("queue",          None)
  
          self.queue2     = Gst.ElementFactory.make("queue",          None)
  
  
  
          # Create the elements
  
          self.source     = Gst.ElementFactory.make("udpsrc",         None)
  
          self.depay      = Gst.ElementFactory.make("rtph264depay",   None)
  
          self.parser     = Gst.ElementFactory.make("h264parse",      None)
  
          self.decoder    = Gst.ElementFactory.make("avdec_h264",     None)
  
          self.sink       = Gst.ElementFactory.make("appsink",        None)
  
  
  
          # Add elements to pipeline
  
          self.pipeline.add(self.source)
  
          self.pipeline.add(self.queue1)
  
          self.pipeline.add(self.depay)
  
          self.pipeline.add(self.parser)
  
          self.pipeline.add(self.decoder)
  
          self.pipeline.add(self.queue2)
  
          self.pipeline.add(self.sink)
  
  
  
          # Set properties
  
          self.source.set_property('port', 5000)
  
          self.source.set_property('caps', Gst.caps_from_string("application/x-rtp, encoding-name=H264,payload=96"))
  
          self.sink.set_property('emit-signals', True)
  
          # turns off sync to make decoding as fast as possible
  
          self.sink.set_property('sync', False)
  
          self.sink.connect('new-sample', self.on_new_buffer, self.sink)
  
  
  
  
  
  
  
  
  
      def on_new_buffer(self, appsink, data):
  
          print "exec two..."
  
          appsink_sample = GstApp.AppSink.pull_sample(self.sink)
  
          # with open('example.h264', 'a+') as streamer:
  
          buff = appsink_sample.get_buffer()
  
          size, offset, maxsize = buff.get_sizes()
  
          frame_data = buff.extract_dup(offset, size)
  
          print(size)
  
          # flag, info = buff.map(Gst.MapFlags.READ)
  
          # streamer.write(info.data)
  
          # print(info.size)
  
          return False
  
  
  
      def run(self):
  
          ret = self.pipeline.set_state(Gst.State.PLAYING)        
  
          if ret == Gst.StateChangeReturn.FAILURE:
  
              print("Unable to set the pipeline to the playing state.")
  
              exit(-1)
  
  
  
          self.mainloop.run()
  
  
  
      def kill(self):
  
          self.pipeline.set_state(Gst.State.NULL)
  
          self.mainloop.quit()
  
  
  
      def on_eos(self, bus, msg):
  
          print('on_eos()')
  
          self.kill()
  
  
  
      def on_error(self, bus, msg):
  
          print('on_error():', msg.parse_error())
  
          self.kill()
  
  
  
      def on_message(self, bus, message):
  
          t = message.type
  
          if t == Gst.MessageType.EOS:
  
              print "End of Stream :("
  
              self.kill()
  
          elif t == Gst.MessageType.ERROR:
  
              err, debug = message.parse_error()
  
              print "Error: %s" % err, debug
  
              self.kill()
  
  
  
  
  
      def on_sync_message(self, bus, message):
  
          print message.src
  
  
  
  
  
  example = Example()
  
  example.run()

  Firstly AppSink callback does not working, I don’t know why ? I think I have to make that configuration correct into Python Code. Can any one please help to figure it out ?

  Secondly when I tried with FFMpeg and FFPlay I got so many H264 encoding issues like this :

  

  Main confusion is Can GStreamer handle Multiple Source data into a single sink(I need to distinguished each video frame).

  Thanks a lot.