Undefined symbols for architecture armv7:
  "avformat_open_input(AVFormatContext**, char const*, AVInputFormat*, AVDictionary**)", referenced from:
      -[ViewController viewDidLoad] in ViewController.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)
 
 
$ xcrun -sdk iphoneos lipo -info libavformat.a                                                                   
Architectures in the fat file: libavformat.a are: armv7 armv7s

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