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• How to stream from ffmpeg to multiple udp clients ?

  24 mars 2021, par SelectedVertex

  Hello I'm streaming my own virtual camera to a localhost using ffmpeg using :

  


  ffmpeg -re -f dshow -i video="VTX_VirtualCam":audio="VTX_VirtualMic" -preset ultrafast -tune zerolatency -b 100000k -f mpegts udp://127.0.0.1:22588 -fflags nobuffer


  


  It works fine but I only can connect to it from single client at the same time but I want to connect from different and multiple clients.

  


  If I be connected and use another client it throws :

  


  


  bind failed : Error number -10048 occurred

  


  


  How can I do this ?
I have c++/c# programming skills as well if needed.

  


• ffmpeg : Continuous streaming plus recording at random time

  21 juin 2014, par Ralf Anderson

  It’s possible to stream and record the same input at the same time with ffmpeg. What I want to do though, is only start (and stop) recording at some random point later.

  Is it possible to somehow tell the active ffmpeg process (which is already streaming) to also start recording ?
  My first alternative was to simply start another ffmpeg process just to record, but the source input will be blocked by the first ffmpeg process streaming it and the stream will be blocked by the viewer displaying the stream on screen, so I can’t access anything to record. Can I change something so the stream/source input is not reserved for just one receiver ?

  In my concrete scenario, the source input is a webcam, which I want to continuously display plus be able to record at user-driven time. I stream the webcam using ffmpeg via udp to the localhost and can view it with a suitable player. I just can’t record it while also viewing and vice versa.

  I also tried the "Tee Muxer", which can generate multiple outputs with the same ffmpeg instance. I streamed it to the localhost on different ports, one to view and one to record.

  ffmpeg.exe -f dshow -i video="ManyCam Virtual Webcam" -map 0 -vcodec h264 -r 25 -f tee "[f=mpegts]udp://127.0.0.1:33333/|[f=mpegts]udp://127.0.0.1:33334/"

  This works fine, except for the delay of about 500ms, which I only get when I stream, not when I access the Webcam directly with ffplay e.g.. I was expecting no delay at all, since it’s all local, but I suppose this comes from the encoding ? I’ve tried streaming the raw video (setting -vcodec rawvideo), but I can neither view it with ffplay nor record it. Are there some special parameters needed for rawvideo ? After all, the input for the stream is rawvideo too, according to ffmpeg.

  I have not yet looked at ffserver, but I assume it would be no different to generating multiple outputs with tee muxer in my use case ?

  If I somehow could be able to display/record the stream generated by

  ffmpeg.exe -f dshow -i video="ManyCam Virtual Webcam" -map 0 -vcodec rawvideo -r 25 -f tee "[f=mpegts]udp://127.0.0.1:33333/|[f=mpegts]udp://127.0.0.1:33334/"

  then that would already suffice. Or changing the encoding in such a way that no compression is done at all should work just as well (if that’s causing the delay).

• Audio and Video Recording Issues with FFMPEG [closed]

  7 octobre 2023, par Austin Althouse

  I am trying to use FFMPEG to stream a specific window on my computer. While the video works flawlessly, adding the audio is being problematic. Whenever I had audio (using -f dshow), the video's fps dramatically drops to 3 to 5 fps and a ton of dropped frames occur. Here is the command I am using : ffmpeg -f gdigrab -draw_mouse 0 -i title="MainWindow" -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -c:v mpeg2video -b:v 4000k -c:a aac -b:a 64k -f mpegts udp ://localhost:1234

  


  The audio doesn't seem clear also.

  


  What is going on and how can I fix it ?

  


  I tried different commands with no success.