dyld: Library not loaded: /usr/local/opt/ffmpeg/lib/libswscale.5.dylib Referenced from: /Users/jiafengwu/Library/Developer/Xcode/DerivedData/ffdemo-gqmgjyhlyiyktmdpikmfktmubkzg/Build/Products/Debug/ffdemo.app/Contents/MacOS/ffdemo Reason: no suitable image found. Did find: /usr/local/opt/ffmpeg/lib/libswscale.5.dylib: code signature in (/usr/local/opt/ffmpeg/lib/libswscale.5.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed. /usr/local/lib/libswscale.5.dylib: code signature in (/usr/local/lib/libswscale.5.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed. /usr/local/Cellar/ffmpeg/4.4_2/lib/libswscale.5.9.100.dylib: code signature in (/usr/local/Cellar/ffmpeg/4.4_2/lib/libswscale.5.9.100.dylib) not valid for use in process using Library Validation: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.