[Ffmpeg-devel] counting Frames

[Patrick Fischer]

I have a Problem with counting Frames.
This part Code seems to works fine but the Framecounter shows different 
  Framenumbers then avidemux or Mainactor.
My algo shows ~23000 proceded Frames, but avidemux and Mainactor shows 
me ~25000 Frames.
After upto 10 Frame the first Frame is missing.
What has happen?

sFrame VideoStream::getNextFrame() {
     int found = 0 ;
     while(av_read_frame(pFormatCtx, &packet)>=0 && !found ) {
         // Is this a packet from the video stream?
         if(packet.stream_index==videoStream) {
             // Decode video frame
             avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,
                                  packet.data, packet.size);
             // Did we get a video frame?
             if(frameFinished) {
                 currentFrameNumber++;
                 // Convert the image from its native format to Gray
		......
                 av_free_packet(&packet);
                 found = 1;
             }
         }
         // Free the packet that was allocated by av_read_frame
         av_free_packet(&packet);
     }

     sFrame frame;
     *frame.data = *pFrameGRAY->data;
     if(firstFrame) {
         firstFrame=0;
         frame.number = pCodecCtx->frame_number;
     } else {
         //frame.number = currentFrameNumber;
         frame.number = pCodecCtx->frame_number-firstPTS;
     }
     return frame;
}