ffmpeg: Do not fail if a demuxer and decoder use the same option identifer

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 1 insertions, 0 deletions

diff --git a/ffmpeg.h b/ffmpeg.h
index 30890a0ee8..06ef13243a 100644
--- a/ffmpeg.h
+++ b/ffmpeg.h
@@ -502,6 +502,7 @@ void show_usage(void);
 
 void opt_output_file(void *optctx, const char *filename);
 
+void remove_avoptions(AVDictionary **a, AVDictionary *b);
 void assert_avoptions(AVDictionary *m);
 
 int guess_input_channel_layout(InputStream *ist);