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• Fluent-ffmpeg : merging video and audio = wrong frames

  5 juin 2015, par rhanb

  I’m trying to merge a video (mp4) without audio stream with an audio file (mp3). I’m developing under nodewebkit a video software which means that I have to use ogg files, so when the user upload a video or a audio file it converts it in ogg whatever its format. Then when the user want to export its video I’m exporting frames from a canvas to PNG images. Once this is done I’m creating a video from the frames with a 30 fps with this following code :

  var videoMaker = function () {
  
  
  
      console.log('videoMaker');
  
  
  
      var deffered = Q.defer();
  
      if (!FS.existsSync($rootScope.project.path + '/video')) {
  
          filestorageService.createFolder($rootScope.project.path + '/video');
  
      }
  
      audioMaker().then(function () {
  
          var commandVideo = new Ffmpeg({
  
              source: $rootScope.project.path + '/frames/%d.png'
  
          });
  
          commandVideo.setFfmpegPath(ffmpegPath);
  
          commandVideo.addOptions(['-c:v libx264', '-r 30']).withFpsInput(30).format('mp4').on('error', function (err) {
  
              console.log('video', err);
  
          }).on('end', function () {
  
              console.log('video win');
  
              deffered.resolve();
  
          }).save($rootScope.project.path + '/video/rendu.mp4');
  
      });
  
      return deffered.promise;
  
  };

  Then i’m reconverting the audio wich has been uploaded by the user to mp3 :

  var audioMaker = function () {
  
  
  
      console.log('audioMaker');
  
      var deffered = Q.defer();
  
      if ($rootScope.project.settings.music.path !== '') {
  
          FS.writeFileSync($rootScope.project.path + '/music/finalMusic.mp3', null);
  
          var commandAudio = new Ffmpeg({
  
              source: $rootScope.project.settings.music.path
  
          });
  
          commandAudio.setFfmpegPath(ffmpegPath);
  
          if ($rootScope.project.settings.music.fadeIn) {
  
              commandAudio.audioFilters('afade=t=in:ss=0:d=0.5');
  
          }
  
          console.log($rootScope.project.settings.music.fadeOut, $rootScope.project.settings.music.fadeIn);
  
          if ($rootScope.project.settings.music.fadeOut) {
  
              var time = sceneService.getTotalDuration() - 0.5;
  
              commandAudio.audioFilters('afade=t=out:st=' + time + ':d=0.5');
  
          }
  
          commandAudio.toFormat('mp3').on('end', function () {
  
              console.log('audio win');
  
              deffered.resolve();
  
          }).on('error', function (err) {
  
              console.log('audio', err);
  
          }).save($rootScope.project.path + '/music/finalMusic.mp3');
  
      } else {
  
          deffered.resolve();
  
      }
  
      return deffered.promise;
  
  };

  Until there everything is alright those files work well but when i do this :

  var command = new Ffmpeg({
  
      source: $rootScope.project.path + '/video/rendu.mp4'
  
  });
  
  command.setFfmpegPath(ffmpegPath);
  
  console.log($rootScope.project.settings.music.path !== '');
  
  if ($rootScope.project.settings.music.path !== '') {
  
      command.addInput($rootScope.project.path + '/music/finalMusic.mp3');
  
      command.addOptions(['-c:v copy', '-c:a copy']);
  
      if ($rootScope.project.settings.music.duration > sceneService.getTotalDuration()) {
  
          command.addOptions(['-shortest']);
  
      }
  
      command.on('error', function (err) {
  
          console.log(err);
  
      }).on('end', function () {
  
          console.log("win");
  
          //filestorageService.rmFolder($rootScope.project.path + '/frames');
  
      }).save($rootScope.project.path + '/video/rendu.mp4');
  
  } else {
  
      filestorageService.rmFolder($rootScope.project.path + '/frames');
  
  }

  And my final file has the music and the right duration but the frames aren’t right, any ideas ?

• RTSP streaming to video file using FFMPEG library

  17 août 2017, par Gona

  I want to save video taken with a network camera(IP camera) as a video file like .avi.

  At first I tried OpenCV but I have a codec problem and try to use FFMPEG.
  This is the first time to use FFMPEG so I am looking for some sample code.

  The overall project structure is C# with a C++ DLL, so I want to save(or write or record) the camera stream as a video file in C++.

  Camera stream is received using RTSP, and the RTSP URL is also known.
  How to save RTSP stream as video file using FFMPEG library ? The codec is H264.

  I would appreciate it if you could show me some sample code.

  My development environment is 64-bit Windows 10 and Visual Studio 2015.
  I downloaded FFMPEG library version 20170817-92da230, 64-bit architecture and linking both Shared and Dev from here https://ffmpeg.zeranoe.com/builds/

• OpenCV won't open some videos of many videos of the same format

  2 octobre 2013, par OpenMinded

  I am using Visual Studio 2012 with OpenCV 2.4.6.

  I have 4 videos that I recorded one by one with my Nokia Lumia 920. OpenCV won't open .mp4 format from my phone by the default. So I converted all these 4 videos using Sony Vegas to .mp4 with the SAME preferences for all of them. Now the problem is that OpenCV has a problem to open two of them. The other two works like a charm with no problem. Below is the information about codec that I used (Yes, it is the same for all videos) :

  

  And this is the error :

  

  Why is it so that they are the same type but only a few of them are loaded properly ?