[FFmpeg-cvslog] avformat/matroskaenc: Add support for FlagTextDescriptions

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Tue Feb 16 19:49:16 2021 +0100| [053144008e4aff48678823eefbfa4d6dec21a3cc] | committer: Andreas Rheinhardt

avformat/matroskaenc: Add support for FlagTextDescriptions

This is the Matroska equivalent of D_WEBVTT_DESCRIPTIONS and is
therefore only enabled for subtitles.

Reviewed-by: Ridley Combs <rcombs at rcombs.me>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=053144008e4aff48678823eefbfa4d6dec21a3cc
---

 libavformat/matroskaenc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index e5efba5408..2bfdb67308 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1359,6 +1359,8 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
             av_log(s, AV_LOG_ERROR, "Subtitle codec %d is not supported.\n", par->codec_id);
             return AVERROR(ENOSYS);
         }
+        if (mkv->mode != MODE_WEBM && st->disposition & AV_DISPOSITION_DESCRIPTIONS)
+            put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGTEXTDESCRIPTIONS, 1);
 
         if (mkv->mode != MODE_WEBM || par->codec_id != AV_CODEC_ID_WEBVTT)
             native_id = MATROSKA_TRACK_TYPE_SUBTITLE;