From e838e6cbe2d8ab4ad9cea85e04e545ff27e97bdb Mon Sep 17 00:00:00 2001
From: Scott Theisen <scott.the.elm@gmail.com>
Date: Sat, 14 Dec 2024 17:00:23 -0500
Subject: [PATCH] avformat/mpeg: demux ivtv captions

The packets start 'IVT0' or 'ivt0'
('I' = 0x49, 'i' = 0x69).

Signed-off-by: Marth64 <marth64@proxyid.net>
---
 libavformat/mpeg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 2c766a4ee9..4d732aaf86 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -620,6 +620,9 @@ redo:
     } else if (startcode >= 0xfd55 && startcode <= 0xfd5f) {
         type     = AVMEDIA_TYPE_VIDEO;
         codec_id = AV_CODEC_ID_VC1;
+    } else if (startcode == 0x69 || startcode == 0x49) {
+        type     = AVMEDIA_TYPE_SUBTITLE;
+        codec_id = AV_CODEC_ID_IVTV_VBI;
     } else {
 skip:
         /* skip packet */