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• Loading and unloading C jni library based on when it's needed

  30 septembre 2014, par Alin

  I finally managed to compile ffmpeg for android and I’ve been able to use it in my app.

  Here is the scenario of my app :

  • I show the user a gridview with thumbnails of images and videos
  • the user can click on a cell and it is taken to image/video details where he can see the full image or play the video
  • the user can apply an image over an video and this is when ffmpeg is used

  So basically, the user might never actually use the watermarking option or he can do it very rare because the amount of available videos is way smaller than images.

  I am loading the ffmpeg library, first time it is needed by running :

  static {
  
       System.loadLibrary("ffmpeglib");
  
  }

  Now here are my questions :

  1. loading the library like this, uses app’s memory and resources ?
  2. can I unload the library, or better said, is it needed to unload it ? I have not found any java code like System.unloadLibrary to take care of unloading
  3. Since the library might be used rarely, wouldn’t a load => do encoding => unload be a better approach ? Or maybe having it loaded would allow easy reuse since no loading is necessary.
  4. If I use an IntentService to load the library and make the encoding, when the service completes the job, does the library gets unloaded ?

• I am trying add text and image over video using FFmpeg lib in androoid studio

  21 juin 2019, par vikram

  I am using FFmpeg lib for add text over video and add image over video but could not get successful. I am testing this one in a real device.

  I am have already tried 2 commands for add text and add image over video but could not get proper output

  String command[]={"ffmpeg","-i",inputpath,"-vf", "drawtext="+"\""+"fontfile=/sdcard/retro.ttf: text='Test Text'"+"\"",outputpath};
  
  
  
  
  
  String addimg[]={"ffmpeg","-i", inputpath,"-i", imagepath ,"-filter_complex", "[0:v][1:v] overlay=25:25:enable='between(t,0,10)'" ,"-pix_fmt", "yuv420p", "-c:a copy",outputpath};
  
  
  
  public void LoadFFmpegLibrary()
  
  {
  
      if(ffmpeg==null)
  
      {
  
          ffmpeg = FFmpeg.getInstance(MainActivity.this);
  
          try {
  
              ffmpeg.loadBinary(new LoadBinaryResponseHandler() {
  
  
  
                  @Override
  
                  public void onStart() {
  
                      Log.e("ffmpeg","Start to load");
  
                  }
  
  
  
                  @Override
  
                  public void onFailure() {
  
                      Log.e("ffmpeg","failed to load");
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess() {
  
                      Log.e("ffmpeg","load Successfully");
  
                      ExcuteFfmpefLibrabry(command);
  
                      //    Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      Log.e("ffmpeg","failed to load");
  
                  }
  
              });
  
          } catch (FFmpegNotSupportedException e) {
  
              // Handle if FFmpeg is not supported by device
  
              Log.e("ffmpeg",e.toString());
  
          }
  
  
  
      }
  
  
  
  
  
  }
  
  
  
  public void ExcuteFfmpefLibrabry(String command[])
  
  {
  
  
  
      ffmpeg = FFmpeg.getInstance(MainActivity.this);
  
      try {
  
          // to execute "ffmpeg -version" command you just need to pass "-version"
  
          ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.e("ffmpeg","Exaction Start");
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {}
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.e("ffmpeg","failed to Excute Command");
  
                  Log.e("ok",message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message) {
  
                  Log.e("ffmpeg","Video Edited Successfully");
  
                  Log.e("ok",message);
  
                  // ExcuteFfmpefLibrabry(tetxcommand);
  
                  Toast.makeText(MainActivity.this,"Success",Toast.LENGTH_LONG).show();
  
  
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
  
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          Log.e("ffmpeg",e.toString());
  
      }
  
  }

  Unable to find a suitable output format for ’ffmpeg’
  ffmpeg : Invalid argument

  I am getting an error ---> Unable to find a suitable output format for 'ffmpeg' ffmpeg: Invalid argument

• How to enable HW decoder via Stagefright in FFmpeg Android port

  29 juin 2012, par vitakot

  I have created a media player based on FFmpeg, it works well, but I need to enable HW decoder. I am trying to compile FFmpeg with Stagefright support – using prepared build script in FFmpeg/tools directory. It compiles fine without any error. I have all libraries. The problem is that once I link resulting libraries with my player I am getting an exception when trying to load it :

  java.lang.UnsatisfiedLinkError: Cannot load library: reloc_library[1314]:  1269 cannot locate '__aeabi_lasr'...

  Without that support everything works perfectly.

  Somebody had a similar problem here. But the solution does not work for me.

  I also changed a build script a bit according to this one - added --extra-libs="-lgcc" and –nostdlib, but nothing changed.

  Has anyone made it working ? There is no readme, no clue, just a build script and that’s all...