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• libdash mpd parser integration with custom player

  19 novembre 2016, par Raj

  I have written a multimedia player using ffmpeg and qt-framework. And currently I support local file playback and progressive download playback in my player. Now I want to add support for mpeg-dash vod stream playback. I thought of using libdash opensource dash library. But after so much of googling I couldn’t find any API or developer documentation regarding the same.

  Also another issue is libdash has integrated network module. But I want only mpd parser to be integrated and I have my own network module for downloading. I couln’t find any doxygen and usage documentation for libdash.

  I need help in these :

  1. Can you anyone point me to any developer documentation available for
     libdash ?
  2. Is there any alternative library for libdash ?

• 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 ?

  


• nutenc/write_index : warn if 2 consecutive keyframes have the same PTS and discard...

  22 décembre 2013, par Michael Niedermayer

  nutenc/write_index : warn if 2 consecutive keyframes have the same PTS and discard the 2nd
  This fixes an assertion failure and regression and restores previous behaviour
  
  Fixes Ticket3197
  An alternative would be to fail hard in this case and refuse to mux such data.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavformat/nutenc.c