I am using ffmpeg library in vs 2010, I need to extract the offset between the start of audio and first frame of video. I am trying using:-

|     avcodec_decode_video2(pCodecCtx,pFrame,&got_picture,&pkt);
av_read_frame(pFormatCtx,&pkt); av_free_packet(&pkt);
int  frrr=pkt.dts*timebase;

//int *gptr=NULL;
avcodec_decode_audio4(pCodecCtx,pFrame,&got_frame,&pkt);
//avcodec_decode_video2(pCodecCtx,pFrame,&got_picture,&pkt);
av_read_frame(pFormatCtx,&pkt);|

AND then finding the difference between video and audio pts. But i am not getting correct value.

Can anybody tell the correct way.

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