AV Sync helps you correct Audio Video timing errors by analyzing a test signal - which consists of a short, synchonized flash and beep, an example of which can be found here. It includes a Test Signal Generator tool, which can be used to correct delay in live applications. Purchase app for advanced features: - a selectable list of results (as shown in screenshot 2 above) - show results in milliseconds, PAL or NTSC frames - more configuration options