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• ffmpeg c/c++ get frame count or timestamp and fps

  23 juin 2016, par broschb

  I am using ffmpeg to decode a video file in C. I am struggling to get either the count of the current frame I am decoding or the timestamp of the frame. I have read numerous posts that show how to calculate an estimated frame no based on the fps and frame timestamp, however I am not able to get either of those.

  What I need : fps of video file, timestamp of current frame or frame no(not calculated)

  What I have : I am able to get the time of the video using

  pFormatCtx->duration/AV_TIME_BASE

  I am counting the frames currently as I process them, and getting a current frame count, this is not going to work longterm though. I can get the total frame count for the file using

  pFormatCtx->streams[currentStream->videoStream]->nb_frames

  I have read this may not work for all streams, although it has worked for every stream I have tried.

  I have tried using the time_base.num and time_base.den values and packet.pts, but I can’t make any sense of the values that I am getting from those, so I may just need to understand better what those values are.

  Does anyone know of resources that show examples on how to get this values ?

• FFMPEG in android issue

  9 janvier 2012, par Antu

  I have successfully compiled the FFMPEG library to android using NDK.
  (using Rock Player FFMPEG implementation)http://www.rockplayer.com/download/rockplayer_ffmpeg_git_20100418.zip

  I know that FFMPEG supports .avi, divX, mov ect. But I created a mediaplayer and tried to run them but I was not able to play them. I is this the right way to use the FFMPEG library. Can Any one Help.I am able to play defaut video, mp4, 3gp etc. Here is the code for mediaplayer

     public native String  stringFromJNI();
  
        static {
  
           System.loadLibrary("ffmpeg");
  
           System.loadLibrary("ffmpeg-test-jni");
  
               }
  
      @Override
  
        public void onCreate(Bundle savedInstanceState) {
  
        super.onCreate(savedInstanceState);
  
  
  
  
  
      setContentView(R.layout.main);
  
  
  
      TextView  tv =(TextView) findViewById(R.id.textView1);
  
      tv.setText( stringFromJNI() );
  
  
  
  
  
      System.gc();
  
  
  
      Log.d("Video FFmpeg ", "**");
  
  
  
      getWindow().setFormat(PixelFormat.TRANSLUCENT);
  
      String filepath = Environment.getExternalStorageDirectory()+"/simple.avi";
  
  
  
      Log.d("File path", filepath);
  
  
  
      MediaController mc = new MediaController(this); 
  
  
  
      VideoView video=(VideoView) findViewById(R.id.video);
  
      mc.setMediaPlayer(video);
  
      video.setVideoPath(filepath);
  
      video.setMediaController(mc);
  
      mc.show();
  
      //video.setVideoPath("/mnt/sdcard/Movies/Ishq-Hothon-Se.3gp");
  
  
  
      video.start();     
  
      View nextButton = findViewById(R.id.button1);
  
      nextButton.setOnClickListener(this);
  
      }
  
  
  
  
  
  
  
    @Override
  
    public void onClick(View v) {
  
    // TODO Auto-generated method stub
  
    Intent i=new Intent(this,NextVideo.class);
  
     startActivity(i);
  
  
  
    }
  
  
  
    }

• How to realize my web video picture in picture ？ [closed]

  17 janvier 2013, par winds

  I want to build a streaming media server in nginx+php that can drag the video progress bar and when my mouse over the video on the progress bar the video show the real-time and the thumbnail.Just like The Youtube. Can anbody understand me ?
  Can the ffmpeg help me realize that or give me some examples !
  I am so sorry. I am from China.Maybe my description is not clear.I have no authority to upload the image.This is the
  URL of the image.
  http://d.hiphotos.baidu.com/zhidao/pic/item/aa64034f78f0f736949dc5c90a55b319eac41392.jpg

  Thank you very much !!