ffmpeg: don't segfault on 0 input files.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffmpeg.c b/ffmpeg.c
index 9859b9bf36..274bdc64b0 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -3863,7 +3863,7 @@ static int opt_output_file(const char *opt, const char *filename)
     }
 
     /* copy global metadata by default */
-    if (metadata_global_autocopy)
+    if (metadata_global_autocopy && nb_input_files)
         av_dict_copy(&oc->metadata, input_files[0].ctx->metadata,
                      AV_DICT_DONT_OVERWRITE);
     if (metadata_streams_autocopy)