[FFmpeg-cvslog] avfilter/f_metadata: correct check for existing metadata

[Gyan Doshi]

ffmpeg | branch: master | Gyan Doshi <ffmpeg at gyani.pro> | Fri Jan 17 15:57:51 2020 +0530| [c95dfe5cce98cde3e7fb14fbd04b3897f3927cec] | committer: Gyan Doshi

avfilter/f_metadata: correct check for existing metadata

When adding metadata, existing dictionary need not be present.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c95dfe5cce98cde3e7fb14fbd04b3897f3927cec
---

 libavfilter/f_metadata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
index bf298e9d39..598257b15b 100644
--- 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,