Hello, i'm new here. I have a small surveillance system: a Dahua nvr (NVR4108-4KS2) paired via cable with a little Imou Bullet ip cam. Whenewer i wish to export videos to my pc, i choose to save in mp4 i notice that audio, in the recording, tends to drift progressively. The longest the time extracted, the longest the delay (after 10 min almost 1 second shifted). Videos exported in DAV format are fine, instead. I would like to ask if anyone can provide any clue about this issue. Please, feel free to ask if more information about my setup is needed .