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• Adjust Opus Ogg page size using Go

  15 mars 2024, par matthew

  Using the code from Go's Pion WebRTC library play-from-disk example I'm able to create a WebRTC connection and send audio from a local Ogg file to peers.

  


  The play-from-disk example README.md details how to first convert the page size of the Ogg file to 20,000 using ffmpeg, like so :

  


  ffmpeg -i $INPUT_FILE -c:a libopus -page_duration 20000 -vn output.ogg


  


  I'd like to make this same adjustment to Ogg data natively in Go, without using ffmpeg. How can this be done ?

  


  I've tried using Pion's oggreader and oggwriter, but using these requires deep Opus file format and RTP protocol knowledge that neither I nor ChatGPT seem to have.

  


  For additional context, I'm using a Text-to-Speech (TTS) API to generate my Ogg data as follows :

  


  req, err := http.NewRequest("POST", "https://api.openai.com/v1/audio/speech", bytes.NewBuffer([]byte(fmt.Sprintf(`{
    "model": "tts-1",
    "voice": "alloy",
    "input": %q,
    "response_format": "opus",
}`, text))))

req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/json; charset=UTF-8")

client := &http.Client{}
resp, err := client.Do(req)



  


  As I'm trying to create a real-time audio app, ideally, I'd like to pipe the response to WebRTC performing the conversion on chunks as these are received so that peers can start to listen to the audio before it has been fully received on the server.

  


• A.R Drone 2.0 Video Streaming Latency

  22 mars 2020, par Danny

  I am working on video streaming with the AR Drone 2.0 using different codes I have found on the internet.
  I’ve attempted ffplay tcp://192.168.1.1:5555 to video stream from the AR Drone 2.0 ; however, the delay is way too high.

  My second attempt was with the following :

  var arDrone = require('ar-drone');
  
  var http    = require('http');
  
  
  
  console.log('Connecting png stream ...');
  
  
  
  var pngStream = arDrone.createClient().getPngStream();
  
  
  
  var lastPng;
  
  pngStream
  
    .on('error', console.log)
  
    .on('data', function(pngBuffer) {
  
      lastPng = pngBuffer;
  
    });
  
  
  
  var server = http.createServer(function(req, res) {
  
    if (!lastPng) {
  
      res.writeHead(503);
  
      res.end('Did not receive any png data yet.');
  
      return;
  
    }
  
  
  
    res.writeHead(200, {'Content-Type': 'image/png'});
  
    res.end(lastPng);
  
  });
  
  
  
  server.listen(8080, function() {
  
    console.log('Serving latest png on port 8080 ...');
  
  });

  This only streamed images. I had to refresh browser every second.

  My third option was using this option :

  var arDrone=require('ar-drone')
  
  var client= arDrone.createclient();
  
  require('ar-drone-png-stream')(client,{port:8000})

  It streamed a lot of images in a short amount of time. The delay is still significant and I’m looking for a video.

  Are there other approaches that will significantly lower the delay of the video stream ?

• Unable to create a PPAPI (Pepper) video plugin -NaCl module failed - how to resolve ?

  27 novembre 2013, par ElHaix

  Google's Say Goodbye to Our Old Friend NPAPI blog post indicates that NPAPI plugin support will cease by the end of 2014 (in favor of PPAPI).

  We have considered the option of using the ffmpeg libraries to create our own video plugin to simply decode RTSP encoded H.264 video streams on the client - important because we need as near real-time video display (avoiding transcoding latency). Using the ffmpeg libraries, there is still a 3-5 second delay in decoding the stream, not as fast as running MPlayer with the -benchmark option.

  In trying Google's PNaCl recommendation, we just got the LOADING status and the following error :

  NativeClient : NaCl module load failed : PnaclCoordinator : Compile
  process could not be created : ServiceRuntime : failed to start

  Are there any other alternatives or suggestions to getting this working ?