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• How the seek frame while playing video ?

  16 mars 2012, par sherman

  I try do this :

  void Java_ffvideo_company_com_NativeCalls_seekFrame(
  
          JNIEnv *env, jobject this, jint time) {
  
  
  
  
  
      if (avformat_seek_file(pFormatCtx, videoStream, 0,time,time, AVSEEK_FLAG_ANY) < 0)
  
          __android_log_print(ANDROID_LOG_DEBUG, "ERROR SEEK->>>",
  
                  "av_seek_frame failed.");
  
  
  
      avcodec_flush_buffers(pCodecCtx);
  
  }

  But the application crashes. Without avcodec_flush_buffers video seeking not correctly. How I can resolve this isssue ?

• Need to get audio video structure for automation ffmpeg or ffprobe

  10 mai 2012, par Sapan Doshi

  I need to get video audio stream information in separate form.

  I have tried ffprobe and mediainfo, but they give full information which needs to be parsed.

  I think there could be option like, where I do not need to parse the full information and get required data.

  $ffprobe -XXX
  audio channels 8

  $ffprobe -YYY
  video_resolution 512x288

  Can anybody help with this.

• Trying to load a video file with ffmpeg using javacv

  11 mars 2012, par Takatakas

  I am trying to load a video file with javacv but I am facing some problems.

  I managed to compile an application that will show an image on screen so I assume that my setup is ok.

  The code I am using is the following.

  import java.io.File;
  
  
  
  import com.googlecode.javacv.CanvasFrame;
  
  import com.googlecode.javacv.FFmpegFrameGrabber;
  
  
  
  public class TestCV{
  
  
  
      public static void main(String[] args) throws Exception {
  
  
  
          File f = new File("input.mp4");
  
          FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(f);
  
  
  
          final CanvasFrame canvas = new CanvasFrame("My Image");
  
  
  
          canvas.showImage(grabber.grab());
  
  
  
      }
  
  }

  Here is the error

  Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\Users\takas\AppData\Local\Temp\jniavutil3690549951281752227.dll: Can't find dependent libraries
  
      at java.lang.ClassLoader$NativeLibrary.load(Native Method)
  
      at java.lang.ClassLoader.loadLibrary0(Unknown Source)
  
      at java.lang.ClassLoader.loadLibrary(Unknown Source)
  
      at java.lang.Runtime.load0(Unknown Source)
  
      at java.lang.System.load(Unknown Source)
  
      at com.googlecode.javacpp.Loader.load(Loader.java:337)
  
      at com.googlecode.javacpp.Loader.load(Loader.java:271)
  
      at com.googlecode.javacv.cpp.avutil.<clinit>(avutil.java:76)
  
      at java.lang.Class.forName0(Native Method)
  
      at java.lang.Class.forName(Unknown Source)
  
      at com.googlecode.javacpp.Loader.load(Loader.java:291)
  
      at com.googlecode.javacv.cpp.avcodec.<clinit>(avcodec.java:87)
  
      at com.googlecode.javacv.FFmpegFrameGrabber.<init>(FFmpegFrameGrabber.java:73)
  
      at com.googlecode.javacv.FFmpegFrameGrabber.<init>(FFmpegFrameGrabber.java:69)
  
      at tester.t.JavaFlow.main(JavaFlow.java:13)
  
  </init></init></clinit></clinit>

  Do I have to use separate ffmpeg dlls ? There is one ffmpeg dll in the opecv bin folder.

  If I have to do this I will need a better way to include them using eclipse. Until now I just add the folder to path variable. For example I added this to make opencv work.

  C :\opencv\build\common\tbb\ia32\vc10~;C :\opencv\build\x86\vc10\bin~;