extern AVOutputFormat ff_asf_stream_muxer;
extern AVInputFormat ff_au_demuxer;
extern AVOutputFormat ff_au_muxer;
+extern AVInputFormat ff_av1_demuxer;
extern AVInputFormat ff_avi_demuxer;
extern AVOutputFormat ff_avi_muxer;
extern AVInputFormat ff_avisynth_demuxer;