lavf/mpegts.c: set some properties for ARIB caption

Some additional properties are set for ARIB caption.
* need_parsing = 0
  ARIB caption doesn't require any parser.
  This avoids "parser not found" warning message.
* need_context_update = 1
  When any profiles are changed, set this flag to notify.

Signed-off-by: rcombs <rcombs@rcombs.me>

libavformat/mpegts.c

@@ -2176,8 +2176,12 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
 
             st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
             st->codecpar->codec_id   = AV_CODEC_ID_ARIB_CAPTION;
-            st->codecpar->profile    = picked_profile;
+            if (st->codecpar->profile != picked_profile) {
+                st->codecpar->profile = picked_profile;
+                sti->need_context_update = 1;
+            }
             sti->request_probe = 0;
+            sti->need_parsing = 0;
         }
         break;
     case 0xb0: /* DOVI video stream descriptor */