According to 14496-12, the duration should be all 1s if
the duration is unknown. This is the case if writing a moov
atom without any samples described in it (e.g. as in ismv files).
---
This is a reformulated version of
http://patches.libav.org/patch/16189/ after reading the spec and
realizing that this even is mentioned there and isn't purely
an ismv/wmp specific thing.
libavformat/movenc.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index ace7b2f..58d3c56 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1317,7 +1317,10 @@ static int mov_write_mdhd_tag(AVIOContext *pb, MOVTrack
*track)
avio_wb32(pb, track->time); /* modification time */
}
avio_wb32(pb, track->timescale); /* time scale (sample rate for audio) */
- (version == 1) ? avio_wb64(pb, track->track_duration) : avio_wb32(pb,
track->track_duration); /* duration */
+ if (!track->entry)
+ (version == 1) ? avio_wb64(pb, UINT64_C(0xffffffffffffffff)) :
avio_wb32(pb, 0xffffffff);
+ else
+ (version == 1) ? avio_wb64(pb, track->track_duration) : avio_wb32(pb,
track->track_duration); /* duration */
avio_wb16(pb, track->language); /* language */
avio_wb16(pb, 0); /* reserved (quality) */
@@ -1361,7 +1364,10 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVTrack
*track, AVStream *st)
}
avio_wb32(pb, track->track_id); /* track-id */
avio_wb32(pb, 0); /* reserved */
- (version == 1) ? avio_wb64(pb, duration) : avio_wb32(pb, duration);
+ if (!track->entry)
+ (version == 1) ? avio_wb64(pb, UINT64_C(0xffffffffffffffff)) :
avio_wb32(pb, 0xffffffff);
+ else
+ (version == 1) ? avio_wb64(pb, duration) : avio_wb32(pb, duration);
avio_wb32(pb, 0); /* reserved */
avio_wb32(pb, 0); /* reserved */
--
1.7.3.1
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