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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.

  


• Configure NVR to accept video stream from IP camera routed through PC

  11 juin 2021, par BenStackover

  I currently have an IP camera connected to an ethernet port on my PC. I also have my PC connected to a network switch via another ethernet cable. I have a NVR connected to the same network switch. I would like to be able to access the video stream from the camera (that is connected to the PC) on the NVR. I have tried restreaming the camera feed using ffmpeg and udp :

  


  ffmpeg -i 'rtsp://user:pwd@192.168.xxx.xxx:554' -preset ultrafast -tune zerolatency -codec:v libx264 -f mpegts udp://admin:admin@192.168.yyy.yyy:8090

  


  where the xxx.xxx is my PC and yyy.yyy is the NVR however the NVR cannot connect. If I connect another PC to the same network switch and change yyy.yyy to that PC's IP I can view the stream.

  


  I have also tried setting up ffserver as an rtsp server using ffserver and can view the rtsp stream from the first PC on the second PC using ffplay rtsp://192.168.xxx.xxx/test1.sdp on the second PC after launching the server on the first PC. I cannot connect to the same stream from the NVR.

  


  Can anyone tell me if what I am attempting to do is even possible ? Ie. how can I make my NVR see a video stream that isn't directly from an IP camera ?

  


  Any help would be much appreciated.

  


  Thanks !

  


• Controlling "Real-Time" sending rate in RTP Streaming with FFMpeg

  14 décembre 2020, par Robert_Ordis

  I'm trying to build an experimental audio telephony system with ffmpeg to talk some G.711 VoIP machine.

  


  Then, I tried this command.

  


  .\ffmpeg.exe -re -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -ac 1 -ab 64k -ar 8000 -f mulaw -f rtp "rtp://192.168.3.175:4449?fifo_size=240&localrtpport=5100&pkt_size=240"


  


  In WireShark capturing, the audio in each packets was actually divided in each around 30[ms].

  


  However, 17- 18 packets was sent together once per 500[ms].

  


  Sent audio was correct, but in this situation, an opponent machine can't treat this correctly.

  


  How do I send these packets in per "UNDER 0.5 SEC" ?