probe files starting with the 1SNh tag

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10861 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/electronicarts.c

@@ -281,6 +281,7 @@ static int process_ea_header(AVFormatContext *s) {
 static int ea_probe(AVProbeData *p)
 {
     switch (AV_RL32(&p->buf[0])) {
+    case ISNh_TAG:
     case SCHl_TAG:
     case MVhd_TAG:
         return AVPROBE_SCORE_MAX;