QuickTime will play multiple audio tracks concurrently if this flag is
set for multiple audio tracks. And if no subtitle track has this flag
set, QuickTime will show no subtitles in the subtitle menu.
---
libavformat/movenc.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++-
libavformat/movenc.h | 1 +
2 files changed, 58 insertions(+), 1 deletion(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 0c6b09d..8f69d64 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1391,7 +1391,9 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVTrack
*track, AVStream *st)
(version == 1) ? avio_wb32(pb, 104) : avio_wb32(pb, 92); /* size */
ffio_wfourcc(pb, "tkhd");
avio_w8(pb, version);
- avio_wb24(pb, 0xf); /* flags (track enabled) */
+ avio_wb24(pb, (track->flags & MOV_TRACK_ENABLED) ?
+ MOV_TKHD_FLAG_ENABLED | MOV_TKHD_FLAG_IN_MOVIE :
+ MOV_TKHD_FLAG_IN_MOVIE);
if (version == 1) {
avio_wb64(pb, track->time);
avio_wb64(pb, track->time);
@@ -3028,6 +3030,58 @@ static int mov_create_chapter_track(AVFormatContext *s,
int tracknum)
return 0;
}
+/*
+ * st->disposition controls the "enabled" flag in the tkhd tag.
+ * QuickTime will not play a track if it is not enabled. So make sure
+ * that one track of each type (audio, video, subtitle) is enabled.
+ *
+ * Subtitles are special. For audio and video, setting "enabled" also
+ * makes the track "default" (i.e. it is rendered when played). For
+ * subtitles, an "enabled" subtitle is not rendered by default, but
+ * if no subtitle is enabled, the subtitle menu in QuickTime will be
+ * empty!
+ */
+static void enable_tracks(AVFormatContext *s)
+{
+ MOVMuxContext *mov = s->priv_data;
+ int i;
+ uint8_t enabled[AVMEDIA_TYPE_NB];
+ int first[AVMEDIA_TYPE_NB];
+
+ for (i = 0; i < AVMEDIA_TYPE_NB; i++) {
+ enabled[i] = 0;
+ first[i] = -1;
+ }
+
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+
+ if (st->codec->codec_type <= AVMEDIA_TYPE_UNKNOWN ||
+ st->codec->codec_type >= AVMEDIA_TYPE_NB)
+ continue;
+
+ if (first[st->codec->codec_type] < 0)
+ first[st->codec->codec_type] = i;
+ if (st->disposition & AV_DISPOSITION_DEFAULT) {
+ mov->tracks[i].flags |= MOV_TRACK_ENABLED;
+ enabled[st->codec->codec_type] = 1;
+ }
+ }
+
+ for (i = 0; i < AVMEDIA_TYPE_NB; i++) {
+ switch (i) {
+ case AVMEDIA_TYPE_VIDEO:
+ case AVMEDIA_TYPE_AUDIO:
+ case AVMEDIA_TYPE_SUBTITLE:
+ if (!enabled[i] && first[i] >= 0)
+ mov->tracks[first[i]].flags |= MOV_TRACK_ENABLED;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
static int mov_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
@@ -3182,6 +3236,8 @@ static int mov_write_header(AVFormatContext *s)
}
}
+ enable_tracks(s);
+
if (mov->mode == MODE_ISM) {
/* If no fragmentation options have been set, set a default. */
if (!(mov->flags & (FF_MOV_FLAG_FRAG_KEYFRAME |
diff --git a/libavformat/movenc.h b/libavformat/movenc.h
index a6282e1..78001cc 100644
--- a/libavformat/movenc.h
+++ b/libavformat/movenc.h
@@ -85,6 +85,7 @@ typedef struct MOVTrack {
int has_keyframes;
#define MOV_TRACK_CTTS 0x0001
#define MOV_TRACK_STPS 0x0002
+#define MOV_TRACK_ENABLED 0x0004
uint32_t flags;
int language;
int track_id;
--
1.8.3.1
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