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• Getting exception while trying to run ffmpeg via command line in android

  17 septembre 2012, par user1662334

  I want to use ffmpeg via command line arguments in android application.For this purpose :

  1. I have cross-compiled the ffmpeg lib and got the libffmpeg.so
  2. I have stored libffmpeg.so in files directory of the app.

  This is the code i am using :

  public class MainActivity extends Activity {
  
  
  
      Process p;
  
  
  
      @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
              String[] cmd =new String[4];
  
          cmd[0]="/data/data/com.example.ffmpegnew/files/libffmpeg";
  
          cmd[1]="-i";
  
          cmd[2]="mnt/sdcard/music/baba.mp4";
  
          cmd[3]="mnt/sdcard/music/outfile.mp4";
  
  
  
          p = Runtime.getRuntime().exec(cmd,null, new File("/data/data/com.example.ffmpegnew/files"));
  
  
  
          }
  
          catch(Exception e)
  
          {
  
              System.out.println("exception"+e);
  
          }
  
  
  
      }
  
  
  
  }

  This is the exception i am getting :

  09-17 13:47:01.679: I/System.out(3752): exceptionjava.io.IOException: Error running exec(). Command: [/data/data/com.example.ffmpegnew/files/libffmpeg.so, -i, mnt/sdcard/music/baba.mp4, mnt/sdcard/music/outfile.mp4] Working Directory: /data/data/com.example.ffmpegnew/files Environment: null

  Please tell me how to solve this problem.Thanks in advance.

• Using FFMPEG via command line in android

  30 décembre 2012, par user1662334

  I want to use FFMPEG via COMMAND LINE in my android application.For this purpose :

  1. I have cross-compiled the ffmpeg lib and got the libffmpeg.so
  2. I have stored libffmpeg.so and the ffmpeg exectable in files directory of the my project.

  This is the code i am using :

  public class FFMPEGActivity extends Activity

  Process p;
  
  
  
  @Override
  
  public void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.activity_main);
  
  
  
          String[] cmd =new String[4];
  
      cmd[0]="/data/data/com.example.ffmpegnew/files/libffmpeg";
  
      cmd[1]="-i";
  
      cmd[2]="mnt/sdcard/music/baba.mp4";
  
      cmd[3]="mnt/sdcard/music/outfile.mp4";
  
  
  
      p = Runtime.getRuntime().exec(cmd,null, new File("/data/data/com.example.ffmpegnew/files"));
  
  
  
      }
  
      catch(Exception e)
  
      {
  
          System.out.println("exception"+e);
  
      }
  
  
  
  }

  This is the exception i am getting :

  09-17 13:47:01.679: I/System.out(3752): exceptionjava.io.IOException: Error running exec(). Command: [/data/data/com.example.ffmpegnew/files/libffmpeg.so, -i, mnt/sdcard/music/baba.mp4, mnt/sdcard/music/outfile.mp4] Working Directory: /data/data/com.example.ffmpegnew/files Environment: null

  Please tell me how to solve this problem.Thanks in advance.

• FFMpeg(Android) av_read_frame or avcodec_decode_video2 returning same colour

  5 décembre 2012, par Cehm

  I've been experimenting FFMpeg for the past 2 weeks and I'm having a bit of trouble...
  First I've been working with a Galaxy S3, which worked super fine, gave me the best pictures ever but I recently switched to a Galaxy NEXUS which gave me a bunch of problems...

  What I'm doing : I just extract frame from a video

  How I'm doing :

  while(av_read_frame(gFormatCtx, &packet)>=0)
  
          {
  
              // Is this a packet from the video stream?
  
              if(packet.stream_index==videoStream)
  
              {
  
                  // Decode video frame
  
                  avcodec_decode_video2(gVideoCodecCtx, pFrame, &frameFinished, &packet);
  
                  // Did we get a video frame?
  
                  if(frameFinished)
  
                  {//and so on... But our problem is already here...

  Ok, now pFrame is holding a YUV representation of my frame... So, in order to check what I'm getting from the avcodec_decode_video2(...) function I'm just writing pFrame to a file so I can see it with any YUV reader on the web.

  char yuvFileName[100];
  
  sprintf(yuvFileName,"/storage/sdcard0/yuv%d.yuv",index);
  
  FILE* fp = fopen(yuvFileName, "wb");
  
  int y;
  
  // Write pixel data
  
  for(y=0; yheight; y++)
  
  {
  
      fwrite(pFrame->data[0]+y*pFrame->linesize[0], 1, gVideoCodecCtx->width, fp);    
  
  }
  
  for(y=0; yheight/2; y++)
  
  {
  
      fwrite(pFrame->data[1]+y*pFrame->linesize[1], 1, gVideoCodecCtx->width/2, fp);
  
  }
  
  for(y=0; yheight/2; y++)
  
  {
  
      fwrite(pFrame->data[2]+y*pFrame->linesize[2], 1, gVideoCodecCtx->width/2, fp);
  
  }
  
  fclose(fp);

  Ok so Here I now have my result on a file store @ /storage/sdcard0/blabla.YUV on my Galaxy Nexus root memory.

  But If I open the file with (for example XnView, which is meant to display YUV type properly) I only see Dark green on the picture.

  What bothers me is that everything worked properly on Galaxy S3 but something failed on GNexus...

  So here's my question : Why doesn't it work on Galaxy Nexus ?

  Compatibility problem between Gnexus and armeabiv7 ?

  I don't know !

  Regards,
  Cehm