[Libav-user] the parameter got_picture_ptr of the avcodec_decode_video2 function

[chris_magic]

Hi all,
     I want to know something about the function avcodec_decode_video2
.Previously ,I thought once I invoke the function
avcodec_decode_video2(avctx ,pic ,got_picture_ptr ,avpkt) ,and the value of
the got_picture_ptr will be backed.But now ,I find that my idea is wrong ,
with the help of the software of Elecard StreamEye ,I see that at start
server frame ,after two or three frames have been decoded and the vaule of
the got_picture_ptr then will be set .I don't know why? But I  this that
there is something about the buffer.

my codes:
 while(av_read_frame(pFormatCtx, &packet)>=0) {
        // Is this a packet from the video stream?
                if(packet.stream_index==videoStream) {
         // Decode video frame
                 avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,
&packet);
                      if(frameFinished) {  
                                printf("----j = %d \n" ,j);
                        }


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