init ffmpeg only once

zhangmeng

2019-05-07 a96e38b66179a67380132704f76d6abd8f648afe

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set(CMAKE_HOST_SYSTEM "Linux-4.15.0-47-generic")
set(CMAKE_HOST_SYSTEM_NAME "Linux")
set(CMAKE_HOST_SYSTEM_VERSION "4.15.0-47-generic")
set(CMAKE_HOST_SYSTEM_PROCESSOR "x86_64")
 
 
 
set(CMAKE_SYSTEM "Linux-4.15.0-47-generic")
set(CMAKE_SYSTEM_NAME "Linux")
set(CMAKE_SYSTEM_VERSION "4.15.0-47-generic")
set(CMAKE_SYSTEM_PROCESSOR "x86_64")
 
set(CMAKE_CROSSCOMPILING "FALSE")
 
set(CMAKE_SYSTEM_LOADED 1)