extern AVInputFormat ff_webvtt_demuxer;
extern AVOutputFormat ff_webvtt_muxer;
extern AVInputFormat ff_wsaud_demuxer;
+extern AVOutputFormat ff_wsaud_muxer;
extern AVInputFormat ff_wsd_demuxer;
extern AVInputFormat ff_wsvqa_demuxer;
extern AVInputFormat ff_wtv_demuxer;