[FFmpeg-devel] is there any problem in the function av_seek_frame()?

[Cheng TaoTRS]

hi,
	i found a problem when decoding a video file with the format of
(*.mpg), and this is my code:

	AVPacket packet;
	int frameFinished = 0;
	int index = 0;
	int succeed = 0; 
	while(av_read_frame(pFormatCtx,&packet)>=0)
	{
		if(packet.stream_index == videoStream)
		{
			if(++index>300) break;			
			avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,packet.data,
packet.size);
			if(frameFinished)
			{
				succeed++;
			}
		}
	}
	printf("\n%d\t%d\n",index,succeed);

the result is : 301 ,299

however, when adding a av_seek_frame(),like this:

        av_seek_frame(pFormatCtx,-1,AV_TIME_BASE *
        10,AVSEEK_FLAG_BACKWARD);

	AVPacket packet;
	int frameFinished = 0;
	int index = 0;
	int succeed = 0; 
	while(av_read_frame(pFormatCtx,&packet)>=0)
	{
		if(packet.stream_index == videoStream)
		{
			if(++index>300) break;			
			avcodec_decode_video(pCodecCtx, pFrame, &frameFinished,packet.data,
packet.size);
			if(frameFinished)
			{
				succeed++;
			}
		}
	}
	printf("\n%d\t%d\n",index,succeed);

the result turn to : 301  0 

anybody tell me why? is there any problem in the function
av_seek_frame()?
--