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movenc: Only adjust the cts offset at the start of fragments if necessary

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Adjusting it is only necessary when a sidx/tfrf/tfxd atom already has
been written for the previous fragment (since the sidx/tfrf/tfxd atoms
include the duration between the first pts of the previous fragment, to
the first pts of the new fragment).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2015-03-15 23:40:06 +02:00
parent 5cf892d694
commit eee13d6539
1 changed files with 4 additions and 2 deletions
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6
libavformat/movenc.c
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@ -3454,10 +3454,12 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
* of this packet to be what the previous packets duration implies. */
trk->cluster[trk->entry].dts = trk->start_dts + trk->track_duration;
/* We also may have written the pts and the corresponding duration
* in sidx tags; make sure the sidx pts and duration match up with
* in sidx/tfrf/tfxd tags; make sure the sidx pts and duration match up with
* the next fragment. This means the cts of the first sample must
* be the same in all fragments. */
pkt->pts = pkt->dts + trk->start_cts;
if ((mov->flags & FF_MOV_FLAG_DASH && !(mov->flags & FF_MOV_FLAG_FASTSTART)) ||
mov->mode == MODE_ISM)
pkt->pts = pkt->dts + trk->start_cts;
} else {
/* New fragment, but discontinuous from previous fragments.
* Pretend the duration sum of the earlier fragments is