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• Send tcp audio stream to a virtual audio device ?

  2 juillet 2021, par iegrm

  I'm making project to use my Android phone's mic as a recording device on my PC

  


  I can get the audio data of the phone's mic via a tcp localhost connection which routes through usb.

  


  With the following command to VLC, I can playback this audio through the default playback device :

  


  vlc -Idummy --demux rawaud --network-caching=50 tcp://localhost:28200


  


  But how to instead send this audio to a virtual audio device so that I can emulate it as a mic device ?

  


  I have experimented with this project in the past for creating a loopback driver for recording desktop audio using ffmpeg like so :

  


  ffmpeg -f dshow -i audio="CustomLoopbackDevice" out.mp3


  


  ..which I assume would be somewhat similar for creating a virtual audio device. I'll be checking this opensource project for making a virtual audio device but not concerned about it just yet, for now I'm using a trial version of virtual audio cable for testing.

  


  My only real issue at the moment is I'm not sure how to send the recorded audio from the tcp input stream to a virtual audio device.

  


  I'm assuming I could use either ffmpeg/vlc to send that tcp stream to the virtual audio device ? But I'm not sure what the command args for it would be.

  


  I'm using C# to manage the recording and I found this snippet of code for writing from a file to what I assume is a specific device by ID :

  


  WaveStream waveStream = new WaveFileReader("file.wav");
WaveOut waveOut = new WaveOut();
waveOut.DeviceNumber = 0;
WaveOut.Init(waveStream);
WaveOut.Play();


  


  But I'm not sure if this would support reading from the tcp stream instead of from file and how to retrieve device number of virtual device.

  


• ffmpeg sometime will automatically stop streaming

  4 août 2019, par John Walker

  

  this is my stream input

  @echo off
  
  title Stream
  
  del out.ts
  
  ffmpeg -y -i rtmp://222.255.139.102:555/10/liveStream -f mpegts -codec:v mpeg1video -crf 20 -s 375x185 -filter:v "crop=500:180:170:100" -b 300k -r 20 -bf 0 -codec:a mp2 -ar 44100 -ac 1 -b:a 128k out.ts

  this is my output

  > @echo off
  
  title Stream 1
  
  ffmpeg -y -i rtmp://222.255.139.102:555/10/liveStream -f mpegts -codec:v mpeg1video -crf 20 -s 375x185 -filter:v "crop=500:180:170:100" -b 300k -r 20 -bf 0 http://localhost:8081/vid

  this is my node to start the vid

          start cmd /k node C:\Users\Administrator\Desktop\jsmpeg-master\websocket-relay.js vid 8081 8082
  
      start cmd /k call stream.bat
  
      TIMEOUT /T 2
  
  
  
  start cmd /k call stream1.bat

• mplayer or ffmpeg to display video that is beeing pushed to the player ?

  18 décembre 2020, par Sebastian Heyn

  I am planning an application, where an outside video camera should be displayed using mplayer (or any other lightweight video player).

  


  However, instead of connecting the mplayer to the camera server (ffmpeg or something), I want the camera to push the video to the player.

  


  The camera will be on an unstable network, and it will be natted so I cannot access without using a VPN or ssh tunnel. Those tunnels will consume CPU power, bandwidth and connection establish time.

  


  Ideally, the last received frame will be displayed, until the next frame is received, without closing the window.

  


  Does anyone know a way to achieve this using existing software ? BTW : The camera will be connected to a raspberry or simillar.