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movenc: Don't use track_id to decide which track is the first in a moof

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If one track doesn't have any samples within a moof, no traf/trun
is written for it. When the omit_tfhd_offset flag is set, none
of the tfhd atoms have any base_data_offset set, and the implicit
offset (end of previous track fragment data, or start of the moof
for the first trun) is used.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-10-29 09:20:51 +02:00
parent 84bf64d359
commit 573b1de2d7
2 changed files with 4 additions and 1 deletions
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4
libavformat/movenc.c
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@ -2458,7 +2458,7 @@ static int mov_write_trun_tag(AVIOContext *pb, MOVMuxContext *mov,
avio_wb32(pb, track->entry); /* sample count */
if (mov->flags & FF_MOV_FLAG_OMIT_TFHD_OFFSET &&
!(mov->flags & FF_MOV_FLAG_SEPARATE_MOOF) &&
track->track_id != 1)
!mov->first_trun)
avio_wb32(pb, 0); /* Later tracks follow immediately after the previous one */
else
avio_wb32(pb, moof_size + 8 + track->data_offset +
@ -2477,6 +2477,7 @@ static int mov_write_trun_tag(AVIOContext *pb, MOVMuxContext *mov,
avio_wb32(pb, track->cluster[i].cts);
}
mov->first_trun = 0;
return update_size(pb, pos);
}
@ -2598,6 +2599,7 @@ static int mov_write_moof_tag_internal(AVIOContext *pb, MOVMuxContext *mov,
avio_wb32(pb, 0); /* size placeholder */
ffio_wfourcc(pb, "moof");
mov->first_trun = 1;
mov_write_mfhd_tag(pb, mov);
for (i = 0; i < mov->nb_streams; i++) {

1
libavformat/movenc.h
View File

@ -158,6 +158,7 @@ typedef struct MOVMuxContext {
int max_fragment_size;
int ism_lookahead;
AVIOContext *mdat_buf;
int first_trun;
int64_t reserved_moov_pos;