Input:
  async
  bluray
  cache
  concat
  crypto
  data
  file
  ftp
  gopher
  hls
  http
  httpproxy
  mmsh
  mmst
  pipe
  rtp
  srtp
  subfile
  tcp
  udp
  udplite
  unix
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  sftp
  smb
Output:
  crypto
  file
  ftp
  gopher
  http
  httpproxy
  icecast
  md5
  pipe
  prompeg
  rtp
  srtp
  tee
  tcp
  udp
  udplite
  unix
  rtmp
  rtmpe
  rtmps
  rtmpt
  rtmpte
  sftp
  smb
