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avformat/matroskaenc: Don't use size of inexistent Cluster

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In order to determine whether the current Cluster needs to be closed
because of the limits on clustersize and clustertime,
mkv_write_packet() would first get the size of the current Cluster by
applying avio_tell() on the dynamic buffer holding the current Cluster.
It did this without checking whether there is a dynamic buffer for
writing Clusters open right now.

In this case (which happens when writing the first packet)
avio_tell() returned AVERROR(EINVAL); yet it is not good to rely on
avio_tell() (or actually, avio_seek()) to handle the situation
gracefully.

Fixing this is easy: Only check whether a Cluster needs to be closed
if a Cluster is in fact open.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-01-22 20:01:30 +01:00
parent 86de864741
commit 4dd63ae86c
1 changed files with 3 additions and 1 deletions
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4
libavformat/matroskaenc.c
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@ -2332,6 +2332,7 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
if (ret < 0)
return ret;
if (mkv->cluster_pos != -1) {
if (mkv->tracks[pkt->stream_index].write_dts)
cluster_time = pkt->dts - mkv->cluster_pts;
else
@ -2359,9 +2360,10 @@ static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
start_new_cluster = 0;
}
if (mkv->cluster_pos != -1 && start_new_cluster) {
if (start_new_cluster) {
mkv_end_cluster(s);
}
}
if (!mkv->cluster_pos)
avio_write_marker(s->pb,