diff --git a/example/ios/music2.mp3 b/example/ios/music2.mp3
new file mode 100644
index 0000000..bf5fec6
Binary files /dev/null and b/example/ios/music2.mp3 differ
diff --git a/ios-common/Classes/WebRTCClient.swift b/ios-common/Classes/WebRTCClient.swift
index a85bbb2..758cf75 100644
--- a/ios-common/Classes/WebRTCClient.swift
+++ b/ios-common/Classes/WebRTCClient.swift
@@ -144,7 +144,7 @@ open class WebRTCClient: NSObject {
     
     public func setRatio(originalWidth: Int32, originalHeight: Int32) {
         let targetWidth:Int32 = 600;
-        let targetHeight:Int32 = targetWidth * Int32(originalHeight / originalWidth)
+        let targetHeight:Int32 = Int32( Double(targetWidth) * ( Double(originalHeight) / Double(originalWidth) ) )
         
         videoSource!.adaptOutputFormat(toWidth: targetWidth, height: targetHeight, fps: 15)
         self.isRatioDefined = true;