return AVPROBE_SCORE_MAX - 1;
return 50 - 1;
static int mpegvideo_probe(AVProbeData *p){    int code, c, i;    code = 0xff;    /* we search the first start code. If it is a sequence, gop or       picture start code then we decide it is an mpeg video       stream. We do not send highest value to give a chance to mpegts */    for(i=0;i<p->buf_size;i++) {        c = p->buf[i];        code = (code << 8) | c;        if ((code & 0xffffff00) == 0x100) {            if (code == SEQ_START_CODE ||                code == GOP_START_CODE ||                code == PICTURE_START_CODE)                return AVPROBE_SCORE_MAX - 1;            else                return 0;        }    }    return 0;}