init ffmpeg only once

zhangmeng

2019-05-07 a96e38b66179a67380132704f76d6abd8f648afe

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# Compiled Object files
*.slo
*.lo
*.o
*.obj
 
# Compiled Dynamic libraries
#*.so
*.dylib
*.dll
 
# Compiled Static libraries
*.lai
*.la
#*.a
*.lib
 
# Executables
*.exe
*.out
*.app