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• Is it possible to customize frame rate of video capturing in android ?

  2 avril 2013, par dilipkaklotar

  I am currently working on video capturing application. I want to record video with these properties

  h.264 640x480 - 30 FPS, first 90 seconds

  but my device screen size is only 320x480 it doesn't contain any other screen size to capture/record video.

  How to integrate small small video clips and make large

  How to integrate voice to video

  Please give some suggestion to fixed this issue.

• implemention video filter through FFMpeg in Android

  2 octobre 2012, par Deepanjan Das

  I have a video file and am trying to scale it using -vf argument for ffmpeg "Angel" repo version used in an android project.
  The build through NDK is going smooth, but when I write this code, the application starts and exits. If I use any other argument other than -vf it works fine and export the video.

  JNIEXPORT jint JNICALL Java_com_schemaphic_mirrorapp_jni_NativeHelper_hFlipVideoEffect( JNIEnv *env, jstring outFile )
  
  {
  
  //ffplay -i INPUT -vf "crop=iw/2:ih:0:0,split[tmp],pad=2*iw[left]; [tmp]hflip[right]; [left][right] overlay=W/2"
  
  //fmpeg -i input -vf scale=iw/2:-1 output
  
  //ffmpeg -i input -vf yadif=0:0:0,scale=iw/2:-1  output
  
  
  
  char** arguments;
  
  int count = 6;
  
  
  
  arguments = calloc( count, sizeof( char* ) );
  
  
  
  arguments[0] = "ffmpeg";
  
  
  
  arguments[1] = "-i";
  
  arguments[2] = "/sdcard/mirrorapp/cropVideo.mp4";
  
  
  
  arguments[3] = "-vf";
  
  arguments[4] = "scale=120:-1";
  
  
  
  //arguments[5] = "-aspect";
  
  //arguments[6] = "3:2";
  
  //arguments[5] = "-vcodec";
  
  //arguments[6] = "mpeg4";
  
  /*arguments[9] = "-r";
  
  arguments[10] = "19";
  
  arguments[5] = "-cropright";
  
  arguments[6] = "240";
  
  arguments[7] = "-padleft";
  
  arguments[8] = "0";
  
  arguments[9] = "-padtop";
  
  arguments[10] = "0";
  
  arguments[11] = "-aspect";
  
  arguments[12] = "3:2";
  
  arguments[13] = "-an";
  
  arguments[5] = "-vcodec";
  
  arguments[6] = "mpeg4";*/
  
  //arguments[7] = "-sameq";
  
  arguments[5] = "/sdcard/mirrorapp/cropFlipVideo.mp4";
  
  
  
  ffmpeg_main( count, arguments );
  
  //free(arguments);
  
  
  
  return 1;
  
  }

  This gives me an impression that the set up is correct. the argument -vf is somehow not working or am not sure of the newer syntax. Kindly help.

• Multiple call to ffmpeg main fails in Android

  27 mars 2016, par fatih orhan

  I have ported ffmpeg library to Android. Using JNI interface, I am able to run ffmpeg commands by giving arguments to ffmpeg’s main method, just like from command line.

  In order to get a specific part of a video, I use this command :

  ffmpeg -i /mnt/sdcard/input_video.mp4 -ss 00:00:12 -t 00:00:10 -an /mnt/sdcard/output_video.mp4

  and it works great. The video is split from 12. seconds to 22. seconds and the video is saved, the method returns normally (as 0).

  However, if I make a second similar call (different start time for example) just after the first one is completed, ffmpeg is not able to process the request and it throws a segmentation fault.

  For the first call, it gives such an info :

  Guessed Channel Layout for Input Stream #0.0 : mono

  and works. But for the second, the message is like this one :

  Guessed Channel Layout for Input Stream #1.0 : mono

  and it doesn’t work. I don’t know if it has something to do with the error.

  The problem, in general, should be related to static global variables (I think) but I could not manage to reset them properly. What might be the solution to make multiple successful calls to the main method of ffmpeg ?