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• Unhandled stream error in pipe : write EPIPE in Node.js

  28 novembre 2013, par Michael Romanenko

  The idea is to serve screenshots of RTSP video stream with Express.js server. There is a continuously running spawned openRTSP process in flowing mode (it's stdout is consumed by another ffmpeg process) :

  function spawnProcesses (camera) {
  
    var openRTSP = spawn('openRTSP', ['-c', '-v', '-t', camera.rtsp_url]),
  
        encoder = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vcodec', 'libvpx', '-r', 10, '-f', 'webm', 'pipe:1']);
  
  
  
    openRTSP.stdout.pipe(encoder.stdin);
  
  
  
    openRTSP.on('close', function (code) {
  
      if (code !== 0) {
  
        console.log('Encoder process exited with code ' + code);
  
      }
  
    });
  
  
  
    encoder.on('close', function (code) {
  
      if (code !== 0) {
  
        console.log('Encoder process exited with code ' + code);
  
      }
  
    });
  
  
  
    return { rtsp: openRTSP, encoder: encoder };
  
  }
  
  
  
  ...
  
  
  
  camera.proc = spawnProcesses(camera);

  There is an Express server with single route :

  app.get('/cameras/:id.jpg', function(req, res){
  
    var camera = _.find(cameras, {id: parseInt(req.params.id, 10)});
  
    if (camera) {
  
      res.set({'Content-Type': 'image/jpeg'});
  
      var ffmpeg = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vframes', '1', '-s', '800x600', '-f', 'image2', 'pipe:1']);
  
      camera.proc.rtsp.stdout.pipe(ffmpeg.stdin);
  
      ffmpeg.stdout.pipe(res);
  
    } else {
  
      res.status(404).send('Not found');
  
    }
  
  });
  
  
  
  app.listen(3333);

  When i request http://localhost:3333/cameras/1.jpg i get desired image, but from time to time app breaks with error :

  stream.js:94
  
    throw er; // Unhandled stream error in pipe.
  
          ^
  
  Error: write EPIPE
  
      at errnoException (net.js:901:11)
  
      at Object.afterWrite (net.js:718:19)

  Strange thing is that sometimes it successfully streams image to res stream and closes child process without any error, but, sometimes, streams image and falls down.

  I tried to create on('error', ...) event handlers on every possible stream, tried to change pipe(...) calls to on('data',...) constructions, but could not succeed.

  My environment : node v0.10.22, OSX Mavericks 10.9.

  UPDATE :

  I wrapped spawn('ffmpeg',... block with try-catch :

  app.get('/cameras/:id.jpg', function(req, res){
  
  ....
  
      try {
  
        var ffmpeg = spawn('ffmpeg', ['-i', 'pipe:', '-an', '-vframes', '1', '-s', '800x600', '-f', 'image2', 'pipe:1']);
  
        camera.proc.rtsp.stdout.pipe(ffmpeg.stdin);
  
        ffmpeg.stdout.pipe(res);
  
      } catch (e) {
  
        console.log("Gotcha!", e);
  
      }
  
  ....
  
  });

  ... and this error disappeared, but log is silent, it doesn't catch any errors. What's wrong ?

• Can VideoView be detach and reattached without stopping the stream ?

  1er juin 2015, par Thierry-Dimitri Roy

  I’m building an app where the user clicks on a button to show a video full screen. Initially the video is attached to a view inside a ViewPager. To be able to show it fullscreen I detach it from its parent and reattach it to the root view. This works fine, except when the video is switched to fullscreen while playing. When I detach a playing VideoView it just stop and I need to restart it. This is not acceptable since the video starts buffering before resume. Here the part of the code where the detach is done :

      final ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
  
  
  
      final ViewGroup root = (ViewGroup) findViewById(R.id.root);
  
  
  
      Button b = (Button) findViewById(R.id.button);
  
      b.setOnClickListener(new OnClickListener() {
  
  
  
          @Override
  
          public void onClick(View v) {
  
              parent.removeView(mVideoView);
  
  
  
              LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
  
              root.addView(mVideoView, lp);
  
          }
  
      });

  Depending of the device, I have a different log error. Probably because the actual video player is provided by the manufacturer and not the Android SDK. Here are the error logs for a Nexus 7 :

  10-30 20:26:18.618: D/NvOsDebugPrintf(124): NvMMDecTVMRDestroyParser Begin 
  
  10-30 20:26:18.618: D/NvOsDebugPrintf(124): --------- Closing TVMR Frame Delivery Thread -------------
  
  10-30 20:26:18.678: D/NvOsDebugPrintf(124): ------- NvAvpClose -------
  
  10-30 20:26:18.678: D/NvOsDebugPrintf(124): NvMMDecTVMRDestroyParser Done 
  
  10-30 20:26:18.678: D/NvOsDebugPrintf(124): NvMMLiteTVMRDecPrivateClose Done 

  I haven’t been able to detach the video without stopping it. I tried using SurfaceView or TextureView without success.

  I also tried finding a third party video player. I found a commercial one (http://www.vitamio.org/) that I can’t really use for business reason. I found an open source one, that hasn’t been updated in the last year (https://code.google.com/p/dolphin-player/).

  I’m currently targeting Android 4.2 or better on tablet only.

  ---

  Note that the ViewPager is not fullscreen. So I can’t use LayoutParams to make the video fullscreen. I need to remove the VideoView from the parent in the ViewPager and add it to the root view to be able to show it fullscreen.

  The URL I’m testing with : http://bellvps1.cpl.delvenetworks.com/media/e1b3e24ecb944abd8f4ed823a0b76ddc/68f78d35296243bfb46d2418f03f2fd0/bande-annonce---the-secret-life-of-walter-mitty-1-9efcc5c6e52ac07a3edf84a1b21967995b7796a2.m3u8

• Can VideoView be detach and reattached without stopping the it ?

  31 octobre 2013, par Thierry-Dimitri Roy

  I'm building an app where the user clicks on a button to show a video full screen. Initially the video is attached to a view inside a ViewPager. To be able to show it fullscreen I detach it from its parent and reattach it to the root view. This works fine, except when the video is switched to fullscreen while playing. When I detach a playing VideoView it just stop and I need to restart it. This is not acceptable since the video starts buffering before resume. Here the part of the code where the detach is done :

      final ViewGroup parent = (ViewGroup) findViewById(R.id.parent);
  
  
  
      final ViewGroup root = (ViewGroup) findViewById(R.id.root);
  
  
  
      Button b = (Button) findViewById(R.id.button);
  
      b.setOnClickListener(new OnClickListener() {
  
  
  
          @Override
  
          public void onClick(View v) {
  
              parent.removeView(mVideoView);
  
  
  
              LayoutParams lp = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
  
              root.addView(mVideoView, lp);
  
          }
  
      });

  Depending of the device, I have a different log error. Probably because the actual video player is provided by the manufacturer and not the Android SDK. Here are the error logs for a Nexus 7 :

  10-30 20:26:18.618 : D/NvOsDebugPrintf(124) : NvMMDecTVMRDestroyParser Begin
  10-30 20:26:18.618 : D/NvOsDebugPrintf(124) : --------- Closing TVMR Frame Delivery Thread -------------
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : ------- NvAvpClose -------
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : NvMMDecTVMRDestroyParser Done
  10-30 20:26:18.678 : D/NvOsDebugPrintf(124) : NvMMLiteTVMRDecPrivateClose Done

  I haven't been able to detach the video without stopping it. I tried using SurfaceView or TextureView without success.

  I also tried finding a third party video player. I found a commercial one (http://www.vitamio.org/) that I can't really use for business reason. I found an open source one, that hasn't been updated in the last year (https://code.google.com/p/dolphin-player/).

  I'm currently targeting Android 4.2 or better on tablet only.