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• ffmpeg low fps and high latency

  1er août 2018, par chrifdexter97

  i want to broadcast my webcam using ffmpeg to an rtmp nodejs server. i had a couple of issues : the fps is locked between 8-15 frame/s plus a high latency while playing the stream using ffplay.
  this is the server code :

   const { NodeMediaServer } = require('node-media-server');
  
  
  
   const config = {
  
   rtmp: {
  
   port: 1935,
  
   chunk_size: 60000,
  
   gop_cache: true,
  
   ping: 60,
  
   ping_timeout: 30
  
   },
  
   http: {
  
   port: 8000,
  
   allow_origin: '*'
  
   }
  
   };
  
  
  
   var nms = new NodeMediaServer(config)
  
   nms.run();

  the command line to start the webcam broadcast :

   ffmpeg -re -i /dev/video0 -c:v libx264 -preset superfast -tune zerolatency -f flv rtmp://localhost/live/STREAM_NAME

  the command line on the receiver end :

    ffplay http://localhost:8000/live/STREAM_NAME.flv

  the server process uses 0.7 % cpu and 2.8 % mem
  ffmpeg process uses 10-11 % cpu and 3.4 % mem

• Full C++ example avlib\FFMPEG multi input video filtering [on hold]

  30 juillet 2018, par Stefan Pintilie

  I am asking a question and also answering to it, on how to apply a multi input video complex filter using FFMPEG/avlib/avfiler libraries. I am doing this in hope that will help you, since it took couple of days to dig into ffmpeg code source, understanding it, putting the pieces together and make it work. The same could be applied to audio filtering.

  Everything starting from translating the following ffmpeg command into C++ code :

  ffmpeg -i world.mp4 -i back.png -filter_complex "[0:v]pad=1280:1000:0:0:black[pad];[pad][1:v]overlay=140:720[out]" -map "[out]" -map 0:a output.mp4

  Is basically stacking 2 videos on top of each other. The video from bottom has bigger width, so the final video file has the width of the bottom video and the height of all 2 together.

  Anyway that is just an example, the code example I am going to give you it takes any number of input files and a complex filter description, then producing the output.

• How would I create a radially offset mosaic of rtsp streams that transitions to a logo

  18 juillet 2018, par Jack

  I’m new to stack overflow, but I’ve been researching how to do this for a couple weeks to no avail. I’m hoping perhaps one of you has some knowledge I haven’t seen online yet.

  Here is a crude illustration of what I hope to accomplish. I have a video wall of eight monitors - four each of two different sizes. The way it’s set up now, all eight monitors are treated together as one big monitor displaying an oddly shaped cutout of a desktop.

  Eventually I need each individual monitor to display a separate RTSP stream for about thirty seconds, then have the entire display - all eight monitors in conjunction - to fade out into a large logo.

  My problem right now is that I don’t know of a way to mask an rtsp stream so it looks like this rather than this, let alone how to arrange them into a weirdly spaced, oddly angled, multiple aspect-ratio mosaic like in the original illustration.

  Thank you all for your time. I’m just an intern here without insane technical knowhow, but I’ll try to clarify as much as I can.

  -J