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• Record stream from camera to file / live stream

  8 juillet 2015, par sandman

  I’m trying to stream my camera feed to a webpage. For this I’m trying to use FFmpeg to encode the data from the camera preview and output to a file. (I’m new to this, so I’m only trying to write to a file now)

  The camera feed is captured and it starts writing to a flv file but, it freezes my app after a few seconds and the resulting flv is about half a second long.

  bos is a BufferedOutputStream which servers as an input stream for the Ffmpeg ProcessBuilder.

  When a button is clicked, the Ffmpeg process is executed and the writing begins.
  But as I said, it freezes the app after a while. I tried running the Ffmpeg process in an AsyncTask, but it keeps saying FileDescriptor closed, but the app does not freeze when I do it this way, and there is no output as well.

  Here is my onPreviewFrame() :

  public void onPreviewFrame(byte[] b, Camera c) {
  
      if (recording) {
  
          int previewFormat = p.getPreviewFormat();
  
          Log.v(LOGTAG, "Started Writing Frame");
  
  
  
          im = new YuvImage(b, previewFormat, p.getPreviewSize().width, p.getPreviewSize().height, null);
  
          Rect r = new Rect(0, 0, p.getPreviewSize().width, p.getPreviewSize().height);
  
          if (bos != null)
  
              im.compressToJpeg(r, 40, bos);
  
          im = null;
  
  
  
          Log.v(LOGTAG, "Finished Writing Frame");
  
      }
  
  }

  If I can get this fixed, I can probably move on to live streaming.

• How can I start a live stream fixing stdout of ffmpeg prob ?

  8 janvier 2019, par Antonin Rouard

  It is my first time here. Be kind with me ^^ trying to do my best.
  I want to stream a 24/7 live opn Toutube with live-stream-radio ; everything goes well when I start until FFMPEG find an error at code 1 with stdout, probably a problem with the codec or the version of FFMPEG (bad compilation ?).

  How can I fix this to start a stream ? :) thx

  Tried to do a stream with OBS, but it is too complicated on my Raspbian (Raspberry Pi 3B+). I compiled many versions of FFMPEG and I don’t know how to fix this.

  live-stream-radio —start (file directory)

  /////

  ffmpeg stdout :

  ffmpeg err :

  Error : ffmpeg exited with code 1 : Error initializing complex filters.
  Invalid argument

  at ChildProcess.<anonymous> (/home/pi/.nvm/versions/node/v8.11.4/lib/node_modules/live-stream-radio/node_modules/fluent-ffmpeg/lib/processor.js:182:22)
  
  at emitTwo (events.js:126:13)
  
  at ChildProcess.emit (events.js:214:7)
  
  at Process.ChildProcess._handle.onexit (internal/child_process.js:198:12)
  
  </anonymous>

• Live Stream on the fly generated video in asp.net core

  3 juillet 2023, par juffma

  I have a problem where i'm not able to stream a video over the Network due to it being generated live. Currently it's working using MJPEG but thats slow (especially if not in the local network) and has much overhead. I receive the frames of the video as images and currently convert them to JPEG and then build an MJPEG stream.

  


  Would it be possible to generate another stream directly ? So for example "bake" the images into another type that isn't this heavy ?
If not, i currently think of the option to use FFMPEG to capture the MJPEG strteam and pipe it's output back into the App. Now, with this approach, what format would be best suited and how would i live stream it ? (eg. build a controller that correctly serves the FFMPEG pipe output (which, if it helps, i'm getting at a 4096 bytes large buffer)).

  


  Saving the Video to Disk and then just multipart streaming the file is not an option as it would not be live anymore.