void main() async {  
  FileCryptor fileCryptor = FileCryptor(  
	  key: "Your 32 bit key.................",  
	  iv: 16,  
	  dir: "example",  
  );  
  
  File encryptedFile = await fileCryptor.encrypt(inputFile: "video.mp4", outputFile: "video.aes");  
  print(encryptedFile.absolute);  
  
  File decryptedFile = await fileCryptor.decrypt(inputFile: "video.aes", outputFile: "video.mp4");  
  print(decryptedFile.absolute); 
}