ffmpeg with custom UI cross-platform

We have a simple ffmpeg UI windows app in c# (compilable in vs2008 ). It simply fires ffmpeg commands based on options selected in UI. It took me 3 hours to write this working UI app. Your task: - Get me apps with same functioning for linux (arm/ embedded), mac, android, ios. To be given: binaries and source of current app. Deliverable: as required, stable running binaries with sources, and instructions for development environment setup, compile instructions and how to run. Should take less than a day for somebody who knows his/ her stuff. Job relating to ffmpeg, h.264, vp8, aac, rtsp, rtp, rtmp, udp, webm