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• How to implement live video streaming with ffmpeg without using WebRTC ?

  8 août 2024, par Artem

  Following up on my previous question, I'd like to inquire about alternative methods for live video streaming using ffmpeg (WebRTC is not an option due to certain constraints I prefer not to discuss here).

  


  Context :

  


  I have a Go application where a goroutine launches ffmpeg to process a video stream, which is then delivered to the main goroutine via a chan []byte. I tried using WebSocket, but encountered issues as described in the previous question. HLS also didn't work well due to significant latency and artifacts like green squares on the video.

  


  Based on a comment in the previous question, I attempted to stream the video via a simple GET request. Here's the Go handler I implemented :

  


  func stream(helperApp agent.Helper) func(rw http.ResponseWriter, rr *http.Request) {
   a := atomic.Bool{}
   return func(rw http.ResponseWriter, rr *http.Request) {
      if !a.CAS(false, true) {
         http.Error(rw, "already running", http.StatusInternalServerError)
         return
      }

      rw.Header().Set("Access-Control-Allow-Origin", "*")
      rw.Header().Set("Content-Type", "video/mp2t")

      out := make(chan []byte)

      // create StreamParam
      go ScreenCaptureForLiveStream(StreamParam, out) // ffmpeg process starts inside

      r, w := io.Pipe()
      go func() {
         for data := range out {
            w.Write(data)
            fmt.Println(len(data))
         }
      }()
      io.Copy(rw, r)
   }
}



  


  On the client side (HTML) :

  


  <video muted="muted" src="http://localhost:8080/stream" controls="controls"></video>&#xA;

  


  In the browser console, I can see data being received, but the video doesn't play.

  


  FFmpeg is executed with these parameters :

  


  -loglevel error -f avfoundation -framerate 5 -capture_cursor 1 -capture_mouse_clicks 1 -i 1 -c:v libx264 -pix_fmt yuv420p -vf pad='ceil(iw/2)*2:ceil(ih/2)*2' -threads 0 -preset veryfast -bf 2 -f mpegts pipe:1



  


  For validation, I ran :

  


  ffmpeg -i http://localhost:8080/stream -c copy out.mp4



  


  The video was successfully saved and plays.

  


  Question :
What alternative methods exist to implement live video streaming with ffmpeg, aside from WebRTC ? Why does the current approach of streaming video via HTTP GET request not function correctly in the browser, and how can this be resolved ?

  


• How to set header metadata to encoded video ?

  11 juin 2013, par Jona

  I'm encoding some images into an h264 video inside an mp4 container. I'm essentially using the ffmpeg example muxing.c. The thing is I'm trying to set some metadata in the mp4 container such as artist, title, etc...

  I thought using the following would work but it didn't :

  AVDictionary *opts = NULL;
  
  av_dict_set(&opts, "title", "Super Lucky Dude", 0);
  
  av_dict_set(&opts, "author", "Jacky Chan", 0);
  
  av_dict_set(&opts, "album", "Chinese Movie", 0);
  
  av_dict_set(&opts, "year", "05/10/2013", 0);
  
  av_dict_set(&opts, "comment", "This video was created using example app.", 0);
  
  av_dict_set(&opts, "genre", "Action", 0);
  
  
  
  // Write the stream header, if any.
  
  ret = avformat_write_header(oc, &opts);

  After the whole video is created I don't see any metadata written to the video file. Any pointers how to actually do this properly ?

• Revision 6723e34224 : Merge "fix permissions on cpplint.py (0644->0755)" into experimental

  4 mai 2013, par James Zern

  Merge "fix permissions on cpplint.py (0644->0755)" into experimental