Added links to IPTV channels, everything works, but a terrible amount of desync. The picture freezes for a couple of seconds, then comes to life, but the sound is far ahead. I read “IPTV Live X playback stability improvements” but not in [Settings]> [TV]> [Customize TV settings]> [Default size for TS IPTV buffer].

To sync sound there is a plugin AudioSync.

All settings for IPTV at this location: