Supported file protocols:
I.. = Input  supported
.O. = Output supported
..S = Seek   supported
FLAGS NAME
-----
I..   applehttp
I.S   concat
I..   crypto
IOS   file
IO.   gopher
IOS   http
I..   mmsh
I..   mmst
.O.   md5
IO.   pipe
IO.   rtmp
IO.   rtmpt
IO.   rtmpe
IO.   rtmpte
IO.   rtmps
IO.   rtp
IO.   tcp
IO.   udp