[processor.ffmpeg] set safe option to -1 (as default value changed from -1 to 1 in ffmpeg 3.0.1), fix #1023
[processor.ffmpeg] set safe option to -1 (as default value changed from -1 to 1 in ffmpeg 3.0.1), fix #1023

xyuanmu/you-get,zmwangx/you-get,qzane/you-get,xyuanmu/you-get,cnbeining/you-get,smart-techs/you-get,smart-techs/you-get,cnbeining/you-get,qzane/you-get,zmwangx/you-get