Ogg is the native Speex container and indeed is the only Speex container supported by VLC. Yet for some reason I'n getting very high file overhead when I mux Speex in Ogg. For example :sout=#transcode{threads=2,acodec=spx,aenc=speex,channels=1}:duplicate{threads=2,dst=std{audio,access=file,mux=ogg,d...