Hi!
Attached patch fixes reading Closed Captions from a field-encoded
mpeg2video sample from the libav-user mailing list.
Please review, Carl Eugen
From 045a485ffedb3344560070a58a2def659be81700 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <ceffm...@gmail.com>
Date: Wed, 28 Nov 2018 22:45:00 +0100
Subject: [PATCH] lavc/mpeg12dec: Read Closed Captions from second field.
---
libavcodec/mpeg12dec.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 83e5378..c0a54a8 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -1664,6 +1664,17 @@ static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
return AVERROR_INVALIDDATA;
}
+ if (s1->a53_caption) {
+ AVFrameSideData *sd;
+ av_frame_remove_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC);
+ sd = av_frame_new_side_data(
+ s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
+ s1->a53_caption_size);
+ if (sd)
+ memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
+ av_freep(&s1->a53_caption);
+ }
+
if (s->avctx->hwaccel &&
(s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
if ((ret = s->avctx->hwaccel->end_frame(s->avctx)) < 0) {
--
1.7.10.4
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