extern AVOutputFormat ff_caca_muxer;
extern AVInputFormat ff_decklink_demuxer;
extern AVOutputFormat ff_decklink_muxer;
-extern AVInputFormat ff_libndi_newtek_demuxer;
-extern AVOutputFormat ff_libndi_newtek_muxer;
extern AVInputFormat ff_dshow_demuxer;
extern AVInputFormat ff_fbdev_demuxer;
extern AVOutputFormat ff_fbdev_muxer;