The packet starts 'IVT0' or 'ivt0'; for more details see
https://github.com/MythTV/mythtv/blob/master/mythtv/libs/libmythtv/decoders/avformatdecoder.cpp
'I' = 0x49, 'i' = 0x69
---
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 */
--
2.43.0
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