added new PID filter method:
  it is now possible to filter not only by PID, but by exact es_type
  eg.: 224.1.1.50:30050/udp 1 4711 E:0x04:0x0a:ger //only stream german mpeg2 audio

E: //indicates that you want to filter by es_type
0x04: es_type
0x0a: description type
ger:  language

full example (only stream HD video with german audio and germen teletext):
224.1.1.50:30050/udp 1 4711 E:0x1b:0:0,E:4:0x0a:ger,E:6:0x56:deu