1. Build http server ./build_http.sh and start ./httpserver
2. Start transcoding ./ffmpeg.sh --source <url/file> --target http://localhost:8001/master.mpd [--encoder <libx264/h264_videotoolbox>] [--idr <int>]
3. Play dash stream http://localhost:8001/master.mpd
4. Play hls stream http://localhost:8001/master.m3u8
5. Run ./analyze.sh http://localhost:8001/master.mpd to analyze GOP/I-frames structure