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• How to stop ffmpeg video recording in c# ?

  23 octobre 2016, par 최영재

  I am using FFmpeg in application and it start and record video perfectly
  but when I want to stop it ask for press "q", I got a System.EntryPointNotFoundException Error message.

  How can I send message "q" to process which is in running state from application

      int key_q = 81; 
  
  
  
      [DllImport("user32.dll", EntryPoint = "postmessage")]       
  
      private static extern bool postmessage(IntPtr hwnd, uint msg, int wparam, int lparam);
  
  
  
  
  
  
  
      private void button_stop_Click(object sender, EventArgs e)
  
      {
  
            string process = "ffmpeg";
  
  
  
            Process[] pro = Process.GetProcessesByName("ffmpeg");
  
  
  
            pro[0].Refresh();
  
  
  
            IntPtr h = pro[0].MainWindowHandle;
  
  
  
  
  
  
  
            postmessage(h, 0x100, key_q, 0);
  
  
  
  
  
      }

• How to debug ffmpeg c code used in IJKmediaplayer ?

  15 août 2015, par Daniyal Yasin

  I am trying to use the libstagefright codec of ffmpeg to decode an mp4 file using IJKmediaplayer on android. IJKmediaplayer is sort of a wrapper enabling the use of ffmpeg on Android.

  This is the link giving basic info about ijkmediaplayer : https://github.com/Bilibili/ijkplayer

  The link also describes the build process for ijkmediaplayer. First ffmpeg is built then the shared libraries are copied to appropriate places and then I have to import the project in eclipse.

  I use the ijkmediaplayer android project in eclipse as a library project in another android application. The structure is like this :

  |-ijkmediaplayer
  
  | |-jni
  
  |   |-ffmpeg (this folder doesn't have the complete source just headers)
  
  |   |-ijkmedia (some c source files of ijkmediaplayer)
  
  |
  
  |-my_project

  So my question is how do I debug libstagefright.cpp from my application ?

  Libstagefright.cpp is contained in the ffmpeg source not visible in the android ijkmediaplayer project. But used when building the ijkmediaplayer android project as described in the link.

  The debugger easily reaches the code of the ijkmediaplayer android project. But does not proceed to the native code automatically if I press f5.

• Catch "Unfortunately 'app' has stopped working" Error

  2 juillet 2015, par cadesalaberry

  I am using a very unstable library on Android that crashes sporadically. I start it using the startActivity() in my code.

  The unstable part of the code is doing a lot of video processing and uploading the result to a server. I do not really mind if the activity crashes, but I need to signal the server that it did.

  The crash comes from a memory leak (no time to solve it yet). Is there a way I can catch the error a display a more friendly/funny message instead ?

  try {
  
      context.startActivity(intent);
  
  } catch (ApplicationCrashedException e) {
  
      server.notifyServerOfCrash();
  
      toast("I really disliked your face...");
  
  }

  Edit : Here is the Error :

  java.lang.OutOfMemoryError
  
    at dalvik.system.VMRuntime.newNonMovableArray(Native Method)
  
    at java.nio.MemoryBlock.allocate(MemoryBlock.java:125)
  
    at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:72)
  
    at io.cine.android.streaming.FFmpegMuxer.writeSampleData(FFmpegMuxer.java:151)
  
    at io.cine.android.streaming.AndroidEncoder.drainEncoder(AndroidEncoder.java:128)
  
    at io.cine.android.streaming.TextureMovieEncoder.handleFrameAvailable(TextureMovieEncoder.java:264)
  
    at io.cine.android.streaming.TextureMovieEncoder$EncoderHandler.handleMessage(TextureMovieEncoder.java:409)
  
    at android.os.Handler.dispatchMessage(Handler.java:102)
  
    at android.os.Looper.loop(Looper.java:136)
  
    at io.cine.android.streaming.TextureMovieEncoder.run(TextureMovieEncoder.java:219)
  
    at java.lang.Thread.run(Thread.java:841)

  For some reason once the BroadcastActivity runs out of memory, the Activity gets killed and comes back to the previous one. It then displays the ’app’ has stopped working Dialog. If I press OK, it kills the entire application and comes back to the home screen.

  Ideally I would just have it come back to the previous activity notifying the server silently. (Not killing the application)