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, 6 insertions, 0 deletions

diff --git a/demux/demux.c b/demux/demux.c
index ceaa9db79c..63a1c16690 100644
--- a/demux/demux.c
+++ b/demux/demux.c
@@ -713,6 +713,12 @@ char *mp_tags_get_bstr(struct mp_tags *tags, bstr key)
     return NULL;
 }
 
+void mp_tags_clear(struct mp_tags *tags)
+{
+    *tags = (struct mp_tags){0};
+    talloc_free_children(tags);
+}
+
 int demux_info_add(demuxer_t *demuxer, const char *opt, const char *param)
 {
     return demux_info_add_bstr(demuxer, bstr0(opt), bstr0(param));