It does it only when the chnl box is to be written. The specification
for the chnl box (ISO 14496-12) requires proper number of channels to be
written here is it is used, and without the proper number of channels
available it becomes tricky to parse the data, as the number of channels
in this box comes from that value.
Signed-off-by: Erkki Seppälä <erkki.seppala....@nokia.com>
Signed-off-by: OZOPlayer <oz...@nokia.com>
---
libavformat/movenc.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 6e179ef..bbd176f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1031,7 +1031,13 @@ static int mov_write_audio_tag(AVFormatContext *s,
AVIOContext *pb, MOVMuxContex
avio_wb16(pb, 16);
avio_wb16(pb, track->audio_vbr ? -2 : 0); /* compression ID */
} else { /* reserved for mp4/3gp */
- avio_wb16(pb, 2);
+ /* parsing chln box requires the proper number of channels having
been
+ written into the audio header */
+ if (av_stream_get_side_data(track->st,
AV_PKT_DATA_AUDIO_TRACK_CHANNEL_LAYOUT,
+ NULL))
+ avio_wb16(pb, track->par->channels);
+ else
+ avio_wb16(pb, 2);
avio_wb16(pb, 16);
avio_wb16(pb, 0);
}
--
2.7.4
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