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avformat/matroskaenc: Fix ReferenceBlock timestamp 

In order to indicate that the frames in a BlockGroup are not keyframes,
one has to add a ReferenceBlock element containing the timestamp of a
referenced Block that has already been written. The timestamp ought to be
relative to the timestamp of the Block it is attached to. Yet the
Matroska muxer used the relative timestamp of the preceding Block of the
track, i.e. the timestamp of the preceding block relative to the
timestamp of the Cluster containing said block (that need not be the
Cluster containing the current Block). This has been fixed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-01-01 01:58:18 +01:00 committed by James Almer
parent b650046860
commit 6a1bf8634a
1 changed files with 2 additions and 2 deletions
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4
libavformat/matroskaenc.c
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@ -2163,9 +2163,9 @@ static void mkv_write_block(AVFormatContext *s, AVIOContext *pb,
av_free(data);
if (blockid == MATROSKA_ID_BLOCK && !keyframe) {
put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE, track->last_timestamp);
put_ebml_sint(pb, MATROSKA_ID_BLOCKREFERENCE, track->last_timestamp - ts);
}
track->last_timestamp = ts - mkv->cluster_pts;
track->last_timestamp = ts;
if (discard_padding) {
put_ebml_sint(pb, MATROSKA_ID_DISCARDPADDING, discard_padding);