@@ -45,9 +45,10 @@ typedef struct {

 } CryptoContext;

 #define OFFSET(x) offsetof(CryptoContext, x)

+#define D AV_OPT_FLAG_DECODING_PARAM

 static const AVOption options[] = {

-    {"key", "AES decryption key", OFFSET(key), AV_OPT_TYPE_BINARY },

-    {"iv",  "AES decryption initialization vector", OFFSET(iv),  AV_OPT_TYPE_BINARY },

+    {"key", "AES decryption key", OFFSET(key), AV_OPT_TYPE_BINARY, .flags = D },

+    {"iv",  "AES decryption initialization vector", OFFSET(iv),  AV_OPT_TYPE_BINARY, .flags = D },

     { NULL }

 };