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• How to animate video overlay pbg size with ffmpeg ?

  17 septembre 2021, par Nazarii Kahaniak

  I have a png overlay over a video and I am trying to add zoom animation after 10 seconds of the video, so that image takes the whole video size. I have tried to use zoompan for that but I it resized image instantly without any animation. How to smoothly change overlay size with ffmpeg ?

  


  inputs :

  


  '-i', cameraVideoPath,
'-i', overlayPath,


  


  command :

  


  nullsrc=size=$cameraVideoSize [base]; 
[0:v] setpts=PTS-STARTPTS, scale=$cameraVideoSize [p1];
[1:v] scale=640:300,setsar=1/1,zoompan=z='if(gte(in,250),min(pzoom+0.005,10),1)':d=1:s=1920x900,trim=duration=1[overlay];
[base][p1] overlay=shortest=1 [v1];
[v1][overlay]overlay=0:(H-h)


  


• how to ignore or fix false 'unmet dependencies' error ?

  31 août 2014, par yy502

  OS: LMDE 201403

  I previously installed OpenShot (a video editing software), which depends on libmlt6, and libmlt6 depends on ffmpeg. The chain of dependencies auto-installed just fine.

  Today I compiled and installed the latest ffmpeg v2.3.3 and apt-get starts to complain :

  You might want to run 'apt-get -f install' to correct these:
  
  The following packages have unmet dependencies:
  
   libmlt6 : Depends: ffmpeg (>= 5:0.6.2~) but 2.3.3-1 is to be installed
  
  E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

  Well, I’m sure my compiled version of ffmpeg is newer than whatever version libmlt6 requires, but the package manager does not seem to understand the new version number. How can I ignore or fix false ’unmet dependencies’ error, please ?

  Thanks for your time !

  Edit :

  Executing apt-get -f install would install the ffmpeg from repository to /usr/bin/ and uninstall/overwrite my compiled version of ffmpeg in /usr/local/bin/... not really the solution I’m after...

  Edit2 :

  the auto fix of apt-get will remove my compiled version of ffmpeg as prompted below :

  sudo apt-get install -f
  
  Reading package lists... Done
  
  Building dependency tree       
  
  Reading state information... Done
  
  Correcting dependencies... Done
  
  The following extra packages will be installed:
  
    ffmpeg
  
  Suggested packages:
  
    nvidia-libvdpau1
  
  The following packages will be upgraded:
  
    ffmpeg
  
  1 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
  
  Need to get 0 B/1,307 kB of archives.
  
  After this operation, 242 MB disk space will be freed.
  
  Do you want to continue? [Y/n] n
  
  Abort.

• 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,
  
                                  });
  
                              }
  
                          });