sorry for lots of posts now - I have replaced my Le Potato by Raspberry Pi 4 recently and have several issues, which I think make sense to put into seperate threads. This one: I record TV shows from DVB-T2 using WinTV dualHD USB stick. It happens that I get data errors (I currently suspect high load issues that also cause the UI freeze reported earlier). When I then playback and the data error is encountered, image is shortly distorted, but recovers. However, audio is then off by a few seconds to the video. Sometimes (but not always) playback changes speed and image and audio get back in sync (after several seconds), but more often the offset remains.
I can provide example video on demand.