OGG_CLASS         747 libavformat/oggenc.c OGG_CLASS(ogg, Ogg)
OGG_CLASS         778 libavformat/oggenc.c OGG_CLASS(oga, Ogg audio)
OGG_CLASS         797 libavformat/oggenc.c OGG_CLASS(ogv, Ogg video)
OGG_CLASS         819 libavformat/oggenc.c OGG_CLASS(spx, Ogg Speex)
OGG_CLASS         838 libavformat/oggenc.c OGG_CLASS(opus, Ogg Opus)