DS-7604NI-SE Audio/Video out of sync

[arpeus 0]

I have a DS-7604NI-SE NVR with 2 IP cameras with built-in mics.

 

I am having a problem when I export the video that the video/audio are a bit out of sync.

The cameras are recording at 1080P / 15FPS / 2560kbps.

If I record at a higher FPS, the video lags.

 

The two issues the client is having are:

1. The audio/video are a bit out of sync. How can I correct this issue? Is it being slightly out of sync acceptable for IP systems?

2. They say the mic quality is not good enough for what is needed. What other option for an external mic do we have?

• I.e. can we run an external mic into the NVR’s audio-in port that would record to both channels?

 

Please advise, thanks!