avformat/webvttdec: Skip more parts of header to let parsing continue

Signed-off-by: Kristoffer Brånemyr <ztion1@yahoo.se>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/webvttdec.c

@@ -95,6 +95,8 @@ static int webvtt_read_header(AVFormatContext *s)
         /* ignore header chunk */
         if (!strncmp(p, "\xEF\xBB\xBFWEBVTT", 9) ||
             !strncmp(p, "WEBVTT", 6) ||
+            !strncmp(p, "STYLE", 5) ||
+            !strncmp(p, "REGION", 6) ||
             !strncmp(p, "NOTE", 4))
             continue;