First of all, are you sure your camera has replaced the audio interface? See if it has a microphone and a silencer, and see if there is anything wrong with the wiring. Also, see if you can click on the sound icon when you play back the picture. Next time, pay attention to good after-sales products, such as Shenyang Huaqiang Dishi Xinheng, where after-sales are good and there are special technologies. I hope I can help you.