Added note about experimental ffmpeg formats support.
Added note about experimental ffmpeg formats support.

CaptainHayashi/sox,Motiejus/sox,CaptainHayashi/sox,uklauer/sox,CaptainHayashi/sox,uklauer/sox,cbagwell/sox,MageSlayer/sox,pcqpcq/sox,pcqpcq/sox,Distrotech/sox,pcqpcq/sox,uklauer/sox,pcqpcq/sox,Distrotech/sox,mhartzel/sox_personal_fork,mhartzel/sox_personal_fork,cbagwell/sox,MageSlayer/sox,Motiejus/sox,davel/sox,davel/sox,Distrotech/sox,uklauer/sox,jacksonh/sox,jacksonh/sox,cbagwell/sox,davel/sox,davel/sox,CaptainHayashi/sox,cbagwell/sox,MageSlayer/sox,MageSlayer/sox,MageSlayer/sox,Motiejus/sox,jacksonh/sox,Distrotech/sox,Motiejus/sox,mhartzel/sox_personal_fork,mhartzel/sox_personal_fork,jacksonh/sox