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• Hello i need a some istructions to use ffmpeg, I would like a code to get media file info

  16 juillet 2014, par user3547175

  I want to start by saying that i don’t know how to use FFMPEG in C#. I have a program that reads the information of a media file, I use this code about resolution, bitrate

  var player = new WindowsMediaPlayer();
  
  var clip = player.newMedia(file.FullName);
  
  lblLenght_.Text = (TimeSpan.FromSeconds(clip.duration)).ToString();       
  
  
  
  
  
  
  
  ShellFile shellFile = ShellFile.FromFilePath(file.FullName);
  
  lblFPS_.Text = (shellFile.Properties.System.Video.FrameRate.Value / 1000).ToString();
  
  
  
  lblHeight_.Text = shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  lblWidth_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + " px";
  
  lblResolution_.Text = shellFile.Properties.System.Video.FrameWidth.Value.ToString() + "x" + shellFile.Properties.System.Video.FrameHeight.Value.ToString() + " px";
  
  blBitrate_.Text = (shellFile.Properties.System.Video.TotalBitrate.Value / 1000).ToString() + " kb/s";

  but the problem is that ShellFile supports only a few formats, so I found some FFMPEG uses but I don’t know how to work with it. Can someone post the solution or some link to learn how to use it about my problem ?

• UnsatisfiedLinkError for armeabi with Android Studio on Ubuntu but with Android Studio on Windows it works

  14 juillet 2015, par dddog

  I’m working at an Android app that uses ffmpeg-android-arm.jar who contains native libs for video/audio encoding.
  My native libs are included in the project by copying the ffmpeg-android-arm.jar in the app/libs folder. ffmpeg-android-arm.jar is just an archive having the following folder structure lib/armeabi/ and in the armeabi folder being all the native libs as .so files.

  Building the apk using Android Studio on Windows 8 works just fine, the statement bellow, being the first that wants to load a native library working well.

  //neon library optimized for opencv
  
  static {
  
      Log.d(TAG, "about to load library checkneon...");
  
      try {
  
          System.loadLibrary("checkneon");
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      } catch (Error error) {
  
          error.printStackTrace(System.out);
  
      }
  
      Log.d(TAG, "library checkneon loaded!");
  
  }

  Going on Android Studio running on Ubuntu 14.04.02, I’m unable to make my project run, as I keep receiving java.lang.UnsatisfiedLinkError. See the stack trace bellow :

  07-14 20:41:05.616  17018-17018/? D/dalvikvm﹕ Late-enabling CheckJNI
  
  07-14 20:41:05.786  17018-17018/org.myfrogvrvp8 D/RecordActivity﹕ about to load library checkneon...
  
  07-14 20:41:05.786  17018-17018/org.myfrogvrvp8 I/System.out﹕ java.lang.UnsatisfiedLinkError: Couldn't load checkneon from loader dalvik.system.PathClassLoader[dexPath=/data/app/org.myfrogvrvp8-2.apk,libraryPath=/data/app-lib/org.myfrogvrvp8-2]: findLibrary returned null
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Runtime.loadLibrary(Runtime.java:355)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.System.loadLibrary(System.java:525)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at org.myfrogvrvp8.FFmpegRecorderActivity.<clinit>(FFmpegRecorderActivity.java:189)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Class.newInstanceImpl(Native Method)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.Class.newInstance(Class.java:1130)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2210)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.access$700(ActivityThread.java:159)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.os.Handler.dispatchMessage(Handler.java:99)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.os.Looper.loop(Looper.java:176)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at android.app.ActivityThread.main(ActivityThread.java:5419)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.reflect.Method.invokeNative(Native Method)
  
  07-14 20:41:05.791  17018-17018/org.myfrogvrvp8 I/System.out﹕ at java.lang.reflect.Method.invoke(Method.java:525)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
  
  07-14 20:41:05.796  17018-17018/org.myfrogvrvp8 I/System.out﹕ at dalvik.system.NativeStart.main(Native Method)
  
  </clinit>

  I’ve checked both apks, and they both have the native .so files included in the lib/armeabi folder.

  I’m quite puzzled...
  Any help much appreciated !

• pictureBox image dispose exception

  22 octobre 2016, par Dulcia

  I recently wanted to try out AForge.NET as I found it to be quite simple, so I decided to make some simple video playback using Video.FFMPEG namespace from it, so I could put each frame directly on a pictureBox. That alone works well, but I wanted to dispose every image after not being important because it took about 1.5GB memory for no apparent reason. That’s where my problem started. For some reason, it sometimes will just throw this exception (usually when resizing the window). I’m not really sure what it could be caused by. Maybe it’s really a stupid mistake. My guess is that it could be caused by timer, but I could have done a completely different mistake and just cannot see it. This is the exception I keep getting :

      ************** Exception Text **************
  
  System.ArgumentException: Parameter is not valid.
  
     at System.Drawing.Image.get_Width()
  
     at System.Drawing.Image.get_Size()
  
     at System.Windows.Forms.PictureBox.ImageRectangleFromSizeMode(PictureBoxSizeMode mode)
  
     at System.Windows.Forms.PictureBox.OnPaint(PaintEventArgs pe)
  
     at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)
  
     at System.Windows.Forms.Control.WmPaint(Message& m)
  
     at System.Windows.Forms.Control.WndProc(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
  
     at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
  
     at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

  This is the code (I do realize that public variables are not good, I’m just testing of course) :

  public long i = 0;
  
  public Bitmap img;
  
  public VideoFileReader reader;
  
  public System.Timers.Timer aTimer;
  
  
  
  public void render(object source, ElapsedEventArgs e)
  
  {
  
      if (img != null) img.Dispose();
  
      if (i < reader.FrameCount)
  
      {
  
          img = reader.ReadVideoFrame();
  
          pictureBox1.Image = img;
  
      }
  
      i++;
  
  }
  
  
  
  private void button1_Click(object sender, EventArgs e)
  
  {
  
      reader = new VideoFileReader();
  
      aTimer = new System.Timers.Timer();
  
      reader.Open("d:\\result.avi");
  
      aTimer.Elapsed += new ElapsedEventHandler(render);
  
      aTimer.Interval = reader.FrameRate;
  
      aTimer.Enabled = true;
  
  }