diff --git a/ffmpeg/options.go b/ffmpeg/options.go
index 43918bb..323d4b3 100644
--- a/ffmpeg/options.go
+++ b/ffmpeg/options.go
@@ -97,9 +97,9 @@ func (opts Options) GetStrArguments() []string {
 				}
 			}
 
-			if vm, ok := value.(map[string]string); ok {
+			if vm, ok := value.(map[string]interface{}); ok {
 				for k, v := range vm {
-					values = append(values, flag, fmt.Sprintf("%v:%v", k, v))
+					values = append(values, k, fmt.Sprintf("%v", v))
 				}
 			}
 			
@@ -111,4 +111,4 @@ func (opts Options) GetStrArguments() []string {
 	}
 
 	return values
-}
\ No newline at end of file
+}