return i-4;
return i-3;
static int mpeg4video_split(AVCodecContext *avctx,                           const uint8_t *buf, int buf_size){    int i;    uint32_t state= -1;        for(i=0; i<buf_size; i++){        state= (state<<8) | buf[i];        if(state == 0x1B3 || state == 0x1B6)            return i-4;    }    return 0;}