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• merge two videos android

  4 juillet 2016, par Lukas

  I’m new to android, but not new to developing for mobile.

  My goal is to record two videos, and the mix it into one video using audio from both tracks. E.g two recorded videos are both 10 seconds. I want to take the first 5 seconds from the first video, and the last 5 seconds from the second video, combine them together with combined audio from both videos, and have it in an mp4 file.

  On iOS there is an AVFoundation framework, which lets you combine multiple videos and audio into one video file (h.264 codec in mp4 container). I want to achieve similar results on android, but fail miserably at finding frameworks or 3rd party libs for doing that. If anyone could help me by showing some links or any directions where to look for information it would be really helpful. Thanks in advance !

• Node.JS Live Streaming Audio with FFMPEG

  20 avril 2021, par nicnacnic

  I'm trying to create an Express server to live stream audio captured from another application (Discord in this case). I'm able to get a server up and running, but there are a couple issues that need to be solved. Here's my server code so far.

  


  const app = express();
app.get("/", function(req, res) {
    res.sendFile(__dirname + "/index.html");
});
app.get("/audio", function(req, res) {
    const stream = ffmpeg(audio).inputOptions(["-f", "s16le", "-ar", "48k", "-ac", "2"]).format('wav');
    res.writeHead(200, { "Content-Type": "audio/wav" });
    stream.pipe(res);
});
app.listen(8080)


  


  

  1. Silent sections of audio need to be added. When there's no activity on the input, there's no data written to the audio variable. This causes weird behavior, for example I can speak and the audio comes through a second later. Then, if I wait 10 seconds then speak again, the audio comes through 4-5 seconds later. I believe this is a problem with the way I'm using ffmpeg to transcode, but I have no idea how to fix it.

  


  2. Refreshing the client crashes the program. Every time I refresh the client I get an ffmpeg error. Error: Output stream closed. This error doesn't happen if I close it, only on reload.

  


  3. The audio is not synced between clients. Every time I open a new connection, the audio starts playing from the beginning instead of being synced with each other and playing the audio live.

  


  


  This is how it's supposed to work : it captures audio from my app in PCM, converts the audio to WAV with ffmpeg, and then streams the audio live to the clients. The audio needs to be synced with all the clients as best as possible to reduce delay. And I'm using fluent-ffmpeg instead of just regular ffmpeg for the transcoding.
Thanks !

  


• Red5 live stream - huge delay on localhost

  23 janvier 2013, par user1958067

  I m running Red5 1.0.0 RC1, with JW Player and ffmpeg on Linux Mint14

  There is a huge delay while streaming, even when everythings happening on my machine/localhost.

  I do following steps :

  1. FFmpeg : ffmpeg -i 'http://localhost:port' rtmp://localhost/oflaDemo/live.flv

  2. Red5 : TCPnoDelay ist set to true.

  3. JW Player : Bufferlength is set to 0. Also tried 2 and 3.

   :

      <code class="echappe-js">&lt;script type=&amp;#39;text/javascript&amp;#39;&gt;<br />
  
       jwplayer(&amp;#39;mediaspace&amp;#39;).setup({<br />
  
      &amp;#39;flashplayer&amp;#39;: &amp;#39;player.swf&amp;#39;,<br />
  
      &amp;#39;file&amp;#39;: &amp;#39;live&amp;#39;,<br />
  
      &amp;#39;type&amp;#39;: &amp;#39;rtmp&amp;#39;,<br />
  
      &amp;#39;streamer&amp;#39;: &amp;#39;rtmp://localhost/oflaDemo&amp;#39;,<br />
  
      &amp;#39;controlbar&amp;#39;: &amp;#39;none&amp;#39;,<br />
  
      &amp;#39;autostart&amp;#39;: &amp;#39;true&amp;#39;,<br />
  
      &amp;#39;bufferlength&amp;#39;: &amp;#39;3&amp;#39;,<br />
  
      &amp;#39;width&amp;#39;: &amp;#39;640&amp;#39;,<br />
  
      &amp;#39;height&amp;#39;: &amp;#39;380&amp;#39;<br />
  
    });<br />
  
  &lt;/script&gt;
  
  

  The delay is something between 7-10 seconds !
  This all is happening on and from localhost, so bandwith shouldnt be the issue.