Your multicast udp need to convert to http protocol, which compatible with multi devices, like android, iOS, smarttv, web...
We have a lot of experience with live streaming. Especially Nginx, WOWZA, Red5, Live555... We have build a secure module(authentication module) for secure streaming.
We have also worked with FFmpeg for 6 years. My transcoder is based FFmpeg with some customize to more control and stable.
We have also sucessful developed a Video Platform, VOD(video on demand) and Live Video. We have a lot of experience in live transcoding and streaming video. Your solution supports many inputs type as RTMP, UDP, RTSP, RTP, HTTP...output is encoded in H264/AAC over RTMP, UDP, HTTP...target devices are PC, tablet, smartphone( iOS, Android, Windows phone), smarttv.
We can streaming from Camera, Camrecoder, DVB-S, DVB-T video capture card... to web, smartphone, IPTV. We can consult you build a good video streaming system.
We already build android iptv app all in one for settopbox, smartphone, tablet.