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• Options for replacing RTMP for live streaming

  22 décembre 2016, par molokoV

  I have a backend streaming video to web browsers using RTMP. On the browsers we use jwplayer.
  As everybody know flash player is going to be deprecated soon.
  Im looking for options to modify the backend using another streaming solution.

  We have made some test using DASH but it has too much delay for live streamining compared to RTMP.

  What are the options for anyone using RTMP ?

• Best way to pipe audio and video chunks from within python to ffmpeg

  8 mai 2016, par basilikum

  Problem

  I’m getting audio and video chunks from a third-party server and I would like to pipe those chunks to ffmpeg to create a WebM live stream according to these instructions :

  http://wiki.webmproject.org/adaptive-streaming/instructions-to-do-webm-live-streaming-via-dash

  Here they are using input from webcam and microphone but I need to use the data chunks, so the ffmpeg command would look somehow like this :

      cmd = [
  
          "ffmpeg",
  
          "-f", "flv", "-i", "video.fifo",
  
          "-f", "s16le", "-ar", "16000", "-ac", "1", "-i", "audio.fifo",
  
          "-map", "0:0",
  
          "-pix_fmt", "yuv420p",
  
          "-c:v", "libvpx-vp9",
  
          "-s", "640x480", "-keyint_min", "40", "-g", "40", "-speed", "6",
  
          "-tile-columns", "4", "-frame-parallel", "1", "-threads", "8",
  
          "-static-thresh", "0", "-max-intra-rate", "300",
  
          "-deadline", "realtime", "-lag-in-frames", "0",
  
          "-error-resilient", "1",
  
          "-b:v", "3000k",
  
          "-f", "webm_chunk",
  
          "-header", self.video_header,
  
          "-chunk_start_index", "1",
  
          "video_360_%d.chk",
  
          "-map", "1:0",
  
          "-c:a", "libvorbis",
  
          "-b:a", "16k", "-ar", "16000",
  
          "-f", "webm_chunk",
  
          "-audio_chunk_duration", "2000",
  
          "-header", self.audio_header,
  
          "-chunk_start_index", "1",
  
          "audio_171_%d.chk"
  
      ]

  As you can see, I am using a "video.fifo" and "audio.fifo" file, because I thought it would be a good idea to pipe the chunks in via a named pipe, but I can’t get it to work. Here is what I’m doing :

  p = subprocess.Popen(cmd)
  
  fa = os.open("video.fifo", os.O_WRONLY)
  
  fv = os.open("audio.fifo", os.O_WRONLY)

  So I’m starting the subprocess first, so that it opens the fifo files for reading. After that, I should be able to open them for writing but I am not. More specifically, I am able to open the first one, but not the second one. So maybe that has something to do with how ffmpeg handles its inputs if there are more than one, but I just don’t know.

  Question

  How can I either solve the problem of non openable named pipes or how can I achieve what I wanted to achieve without named pipes.

• Linphone Android Import and Build

  29 novembre 2013, par AppleDroid

  I am working on Linphone Library and using GITHUB repo and downloaded the zip file with Download Zip button.

  

  Now when i go through the README file i saw that i need to run ./prepare_sources.sh script then i ran it on terminal but it asks for file to patch as

  Now when i opened the folder inside submodules/externals/ffmpeg — It's completely empty
  and other folders are also empty.
  But on GitHub also i saw it with some kind of black folder which i can't select.
  I am stuck here ? should i do how can i get all these files into my directory so that i can make the build.

  One more thing Should i import this downloaded Zip into my eclipse it shows me these projects which one should i import (Should i import it after i download the Zip from Github or should i import it after running all the scripts to make the build on terminal and then import it in eclipse) ?

  Need Help .