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• FFMPEG fixing broken or wrong video containers extensions

  16 juin 2016, par C0nw0nk

  With ffmpeg what is the correct way to fix incorrect file containers.

  For example :

  We have a input.avi file but the file should be called input.mp4 because the person who uploaded it has renamed it from .mp4 to .avi will ffmpeg’s copy command fix this for us and allow the input.avi to keep its .avi file extension or will it need to become .mp4

  Command Line :

  ffmpeg.exe -y -i input.avi -c:v copy -c:a copy output-fixed.avi

  I read that ffmpeg’s stream copy -c:v copy -c:a copy or -vcodec copy -acodec copy or -c copy command should fix any error with any video container.

  I just want to fix the file by keeping it in the original file extension it was provided in do not want to change it to be .mp4 if it was not uploaded with that extension.

• Video capturing in portrait mode but the orientation is wrong when played back with a media player

  17 octobre 2016, par Ahmed Mujtaba

  I’m trying to make a custom video app. The app captures a video using mediarecorder and uploads it to the website where it’s played on a html5 media player. The issue is that, when I capture the video in portrait mode, the playback video on the website and on vlc player have it’s orientation off by 90 degrees. I have tried various solution on the internet but none work for me.

  Here’s what my code for setting up the media recorder :

   private bool prepareMediaRecorder() {
  
  
  
          Android.Hardware.Camera.Parameters p = mCamera.GetParameters();
  
          List previewSizes = p.SupportedPreviewSizes.ToList();
  
  
  
          //mCamera = GetCameraInstance();
  
          //setCameraDisplayOrientation(Activity, cameraId, mCamera);
  
  
  
          mediaRecorder = new MediaRecorder();
  
          mCamera.Unlock();
  
          mediaRecorder.SetCamera(mCamera);
  
  
  
          mediaRecorder.SetAudioSource(AudioSource.Camcorder);
  
          mediaRecorder.SetVideoSource(VideoSource.Camera);
  
          mediaRecorder.SetOrientationHint(CameraS.result);
  
  
  
          if (currentapiVersion >= 16)
  
          {
  
              mediaRecorder.SetProfile(CamcorderProfile.Get(CamcorderQuality.High)); // requires API Level 8 or higher
  
          }
  
          else
  
          {
  
              mediaRecorder.SetProfile(CamcorderProfile.Get(CamcorderQuality.Q480p)); // requires API Level 8 or higher
  
          }
  
  
  
          //mediaRecorder.SetVideoFrameRate(30);
  
          mediaRecorder.SetOutputFile(localPath);
  
          mediaRecorder.SetMaxDuration(600000); // Set max duration 60 sec.
  
          mediaRecorder.SetMaxFileSize(50000000); // Set max file size 50M
  
          mediaRecorder.SetVideoSize(previewSizes[0].Width, previewSizes[0].Height);
  
          mediaRecorder.SetPreviewDisplay(mPreview.Holder.Surface);
  
  
  
          mediaRecorder.SetOrientationHint(getDisplayOrientationAngle());
  
  
  
          try
  
          {
  
              mediaRecorder.Prepare();
  
          }
  
          catch (IllegalStateException e)
  
          {
  
              releaseMediaRecorder();
  
              return false;
  
          }
  
          catch (Java.IO.IOException e)
  
          {
  
              releaseMediaRecorder();
  
              return false;
  
          }
  
          return true;
  
  
  
  }
  
  
  
  public int getDisplayOrientationAngle() {
  
          //Log.e("", "setDisplayOrientationAngle is call");
  
          int angle;
  
  
  
  
  
          var mDisplayRotation = Activity.WindowManager.DefaultDisplay.Rotation;
  
          // switch (MeasurementNativeActivity.DisplayRotation) {
  
          switch (mDisplayRotation)
  
          {
  
              case SurfaceOrientation.Rotation0: // This is display orientation
  
                  angle = 90; // This is camera orientation
  
                  break;
  
              case SurfaceOrientation.Rotation90:
  
                  angle = 0;
  
                  break;
  
              case SurfaceOrientation.Rotation180:
  
                  angle = 270;
  
                  break;
  
              case SurfaceOrientation.Rotation270:
  
                  angle = 180;
  
                  break;
  
              default:
  
                  angle = 90;
  
                  break;
  
          }
  
          //Log.v("", "media recorder displayRotation: " + mDisplayRotation);
  
          //Log.v("", "media recorder angle: " + angle);
  
          return angle;
  
  
  
  }

  The orientation of the video is fine when played on the phone app but on the website it’s not. I tried to use FFMPEG encoder to rotate the video clockwise. This seemed to fix the orientation of the video, however the aspect ratio of the video is all messed up. The video is stretched vertically and goes off screen.
  The command I’m using to rotate and encode the video is as follows :

  -y -i inputPath -vf scale=640:480,setsar=1,transpose=1 -strict experimental -r 25 -vcodec mpeg4 -b 1000k ab 48000 -ac 2 -ar 22050 destinationPath

  I will really appreciate if someone can help me fix either the orientation of the video or the aspect ration after encoding the video.

  Cheers !

  Edit.

  Here’s the readout of the input file :

  General
  
  Complete name                  : C:\Users\Ahmed\Desktop\9adcdb56-500e-4d3f-8fb2-ccf20c680422_yt.mp4
  
  Format                         : MPEG-4
  
  Format profile                 : Base Media
  
  Codec ID                       : isom
  
  File size                      : 6.30 MiB
  
  Duration                       : 12s 437ms
  
  Overall bit rate               : 4 251 Kbps
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  
  
  Video
  
  ID                             : 1
  
  Format                         : AVC
  
  Format/Info                    : Advanced Video Codec
  
  Format profile                 : Baseline@L3.1
  
  Format settings, CABAC         : No
  
  Format settings, ReFrames      : 1 frame
  
  Format settings, GOP           : M=1, N=31
  
  Codec ID                       : avc1
  
  Codec ID/Info                  : Advanced Video Coding
  
  Duration                       : 12s 323ms
  
  Bit rate                       : 3 967 Kbps
  
  Width                          : 1 280 pixels
  
  Height                         : 720 pixels
  
  Display aspect ratio           : 16:9
  
  Rotation                       : 90°
  
  Frame rate mode                : Variable
  
  Frame rate                     : 29.700 fps
  
  Minimum frame rate             : 29.354 fps
  
  Maximum frame rate             : 30.040 fps
  
  Color space                    : YUV
  
  Chroma subsampling             : 4:2:0
  
  Bit depth                      : 8 bits
  
  Scan type                      : Progressive
  
  Bits/(Pixel*Frame)             : 0.145
  
  Stream size                    : 5.83 MiB (92%)
  
  Title                          : VideoHandle
  
  Language                       : English
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  
  
  Audio
  
  ID                             : 2
  
  Format                         : AAC
  
  Format/Info                    : Advanced Audio Codec
  
  Format profile                 : LC
  
  Codec ID                       : 40
  
  Duration                       : 12s 437ms
  
  Source duration                : 12s 454ms
  
  Bit rate mode                  : Constant
  
  Bit rate                       : 128 Kbps
  
  Nominal bit rate               : 96.0 Kbps
  
  Channel(s)                     : 2 channels
  
  Channel positions              : Front: L R
  
  Sampling rate                  : 48.0 KHz
  
  Compression mode               : Lossy
  
  Stream size                    : 194 KiB (3%)
  
  Source stream size             : 194 KiB (3%)
  
  Title                          : SoundHandle
  
  Language                       : English
  
  Encoded date                   : UTC 2016-05-29 23:54:30
  
  Tagged date                    : UTC 2016-05-29 23:54:30
  
  mdhd_Duration                  : 12454

• Wrong play video after trimmed with ffmpeg

  1er novembre 2016, par Os Sony Louis

  After I cut a video with ffmpeg
  HTML5 video is not displayed video I trim
  this is the source code

  <?php exec("ffmpeg.exe"); 
  
  unlink("../output/dir/cut1.mp4");
  
  clearstatcache();
  
  exec("ffmpeg -ss 00:01:00 -i ../input/1.mp4 -to 00:03:00 -c copy ../output/dir/cut1.mp4");
  
  ?>
  
  <video width="300" height="auto" controls="controls">
  
  <source src="../output/dir/cut1.mp4" type="video/mp4">
  
  </source></video>

  result :
  Result1

  exec("ffmpeg -ss 00:01:00 -i ../input/1.mp4 -to 00:05:00 -c copy ../output/dir/cut1.mp4");

  result :

  Result2

  i must open the new tab to get the new duration from video i’ve trimmed
  i can’t get the new duration in the same tab even i’ve refreshed it
  how come ?