@Steven_Kami I have the same issue. 4 new 2k dome cameras, with the latest firmware, and with high speed 64GB SD cards. When recording from the timeline, none of them have sound in the mp4 file. I dinked around with Sounds setting (alert for abnormal sounds…) and got ONE recording with sound, after which subsequent recordings had no sound. You have a bug sir. My older 1080p dome cameras still record sound to the mp4 file. It’s VERY frustrating this is not working on my new cameras, I’m losing important content, so I’ve rated these as a 1 on Amazon and will update my review when this issue is fixed. HELP???
Thanks!
David