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• avconv/ffmpeg command to encode nice full hd webm for chrome

  18 mars 2016, par xavier.seignard

  People from the artistic direction gave me big .mov and .mp4 that I need to put on a web app, but so far they are so huge that decoding/rendering is kinda bad on chrome (this is a chrome only experience since it will run on electron at the end).

  I’d like to re-encode them in .webm since it seems to have the best support in chrome.

  But I’m kinda lost on how to re-encode them without significative visual quality lost.

  For now I use (taken from https://trac.ffmpeg.org/wiki/Encode/VP8)

  ffmpeg -i myVid.mp4 -c:v libvpx -crf 8 -b:v 2M -c:a libvorbis myVid.webm

  So, does anyone have a nice avconv/ffmpeg command that will produce nice and easy to render .webm ?

  Regards.

• Unable to playback .mp4 audio file in Firefox, works in Chrome

  22 octobre 2015, par SpartanVXL

  I have been trying to play a file through Firefox to see if it is compatible for a website and cannot figure out why it cannot play whereas it will play on Chrome okay. It simply shows a error box that the "video cannot be played because the file is corrupt". I’ve trawled through information on .mp4 files and Firefox’s supported codec types but have not found much aside from recent posts on how FF should be able to play this content in 2015. Here is a ffprobe of the file.

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'two.mp4':
Metadata:
   major_brand     : mp42
   minor_version   : 0
   compatible_brands: M4A mp42isom
   creation_time   : 2015-08-06 08:17:05
   encoder         : Nero AAC codec / 1.5.4.0
   Duration        : 00:03:28.77, start: 0.000000, bitrate: 131 kb/s
   Chapter #0:0    : start 0.027333, end 208.768000
   Metadata:
     title           :
   Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 96000 Hz, stereo, flt p, 128 kb/s (default)

  Any reason why this local file wouldn’t play through FF on Windows 41.0.2 ?

• Chrome "stalling" when streaming mp3 file from nodejs windows only

  8 octobre 2015, par Alan Hollis

  We’ve got a really annoying bug when trying to send mp3 data. We’ve got the following set up.

  Web cam producing aac -> ffmpeg convert to adts -> send to nodejs server -> ffmpeg on server converts adts to mp3 -> mp3 then streamed to browser.

  This works *perfectly" on Linux ( chrome with HTML5 and flash, firefox flash only )

  However on windows the sound just "stalls", no matter what combination we use ( browser/html5/flash ). If however we shutdown the server the sound then immediately starts to play as we expect.

  For some reason on windows based machines it’s as if the sound is being buffered "waiting" for something but we don’t know what that is.

  Any help would be greatly appreciated.

  Relevant code in node

      res.setHeader('Connection', 'Transfer-Encoding');
  
      res.setHeader('Content-Type', 'audio/mpeg');
  
      res.setHeader('Transfer-Encoding', 'chunked');
  
      res.writeHeader('206');
  
  
  
      that.eventEmitter.on('soundData', function (data) {
  
          debug("Got sound data" + data.cameraId + " " + req.params.camera_id);
  
          if (req.params.camera_id == data.cameraId) {
  
              debug("Sending data direct to browser");
  
              res.write(data.sound);
  
          }
  
      });

  Code on browser

         soundManager.setup({
  
                              url: 'http://dashboard.agricamera.co.uk/themes/agricamv2/swf/soundmanager2.swf',
  
                              useHTML5Audio: false,
  
                              onready: function () {
  
                                  that.log("Sound manager is now ready")
  
                                  var mySound = soundManager.createSound({
  
                                      url: src,
  
                                      autoLoad: true,
  
                                      autoPlay: true,
  
                                      stream: true,
  
                                  });
  
                              }
  
                          });