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movenc: Timecode in MP4 Although MP4 does not have a concrete specification to store timecode information, the following technical note from Apple describes a way to achieve this via timecode track, similar to how it is done for MOV files.

Browse Source 
https://developer.apple.com/library/mac/technotes/tn2174/_index.html

- Enabled creation of timecode tracks for MP4 in the same way as MOV.
- Used nmhd as media information header of timecode track of MP4 instead
  of gmhd used in MOV, thus avoiding tcmi also, as recommended above.
- Bypassed adding source reference field for MP4, as suggested above.

Issue: https://trac.ffmpeg.org/ticket/4704

Signed-off-by: Syed Andaleeb Roomy <andaleebcse@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Syed Andaleeb Roomy 2016-01-21 07:08:09 +01:00 committed by Michael Niedermayer
parent 15708f1347
commit b4dcd351ec
1 changed files with 6 additions and 3 deletions
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9
libavformat/movenc.c
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@ -1866,7 +1866,7 @@ static int mov_write_tmcd_tag(AVIOContext *pb, MOVTrack *track)
if (track->st)
t = av_dict_get(track->st->metadata, "reel_name", NULL, 0);
if (t && utf8len(t->value))
if (t && utf8len(t->value) && track->mode != MODE_MP4)
mov_write_source_reference_tag(pb, track, t->value);
else
avio_wb16(pb, 0); /* zero size */
@ -2246,7 +2246,10 @@ static int mov_write_minf_tag(AVIOContext *pb, MOVMuxContext *mov, MOVTrack *tra
} else if (track->tag == MKTAG('r','t','p',' ')) {
mov_write_hmhd_tag(pb);
} else if (track->tag == MKTAG('t','m','c','d')) {
mov_write_gmhd_tag(pb, track);
if (track->mode == MODE_MP4)
mov_write_nmhd_tag(pb);
else
mov_write_gmhd_tag(pb, track);
}
if (track->mode == MODE_MOV) /* FIXME: Why do it for MODE_MOV only ? */
mov_write_hdlr_tag(pb, NULL);
@ -5185,7 +5188,7 @@ static int mov_write_header(AVFormatContext *s)
}
}
if (mov->mode == MODE_MOV) {
if (mov->mode == MODE_MOV || mov->mode == MODE_MP4) {
tmcd_track = mov->nb_streams;
/* +1 tmcd track for each video stream with a timecode */