avfilter/f_metadata: correct check for existing metadata

When adding metadata, existing dictionary need not be present.

diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
index bf298e9d395cd2ba97483f52de58e0785ab98cf0..598257b15b8714c999c992ae4f2216010457c129 100644 (file)
--- a/libavfilter/f_metadata.c
+++ b/libavfilter/f_metadata.c
@@ -304,7 +304,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
     AVDictionary **metadata = &frame->metadata;
     AVDictionaryEntry *e;
 
-    if (!*metadata)
+    if (!*metadata && s->mode != METADATA_ADD)
         return ff_filter_frame(outlink, frame);
 
     e = av_dict_get(*metadata, !s->key ? "" : s->key, NULL,