mpegts: Completely ignore H222 spec and consider reserved adaption

fields to be perfectly fine mpeg TS.
Fixes Ticket580

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/mpegts.c

@@ -399,7 +399,7 @@ static int analyze(const uint8_t *buf, int size, int packet_size, int *index){
     memset(stat, 0, packet_size*sizeof(int));
 
     for(x=i=0; i<size-3; i++){
-        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && (buf[i+3] & 0x30)){
+        if(buf[i] == 0x47 && !(buf[i+1] & 0x80) && buf[i+3] != 0x47){
             stat[x]++;
             if(stat[x] > best_score){
                 best_score= stat[x];