Rev 1.56 has the same audio sync issues, works great with good source video. Otherwise one needs a more powerful tool(s). I tried this as a mts to mov/ProRes converter. When the mts file is in decent shape this app does a nice efficient job. Plenty of nice features, batch capability, easy to set up and run. But if there are glitches in the source media, the app has a tendency to advance the audio before the video, the sync gets several second off. That may have something to do with not looking at the time code. I’m not sure whats better, discovering the problem sooner like crashing like other apps of this type, or messing up the sync, which one won’t discover until later. But for your every day video camera media, it should work just fine.