Update ffmpeg to version 20171027-5834cba
Update ffmpeg to version 20171027-5834cba

coonce/scoop,berwyn/scoop,vidarkongsli/scoop,rasa/scoop,Cyianor/scoop,lukesampson/scoop,nikolasd/scoop,reelsense/scoop,yunspace/scoop,kodybrown/scoop