demux_lavf: clear metadata on update, instead of merging it

Assume a metadata update is a full update. Clear the previous metadata,
so that tags which existed only in the previous metadata are removed.

1 files changed, 1 insertions, 0 deletions

diff --git a/demux/demux_lavf.c b/demux/demux_lavf.c
index c92e4850b2..ee78575de6 100644
--- a/demux/demux_lavf.c
+++ b/demux/demux_lavf.c
@@ -528,6 +528,7 @@ static void update_metadata(demuxer_t *demuxer, AVPacket *pkt)
         AVDictionary *dict = NULL;
         av_packet_unpack_dictionary(md, md_size, &dict);
         if (dict) {
+            mp_tags_clear(demuxer->metadata);
             add_metadata(demuxer, dict);
             av_dict_free(&dict);
         }