The Dahua Starlight series cameras have an Encoding Strategy option called AI Codec within the Video configuration. This has caused gaps in recording when using the ONVIF protocols in Qumulex.
To solve this, login to the cameras webpage, either directly, or via the "Go To Webpage" function within the Qumulex Camera Configuration page.
Once there select Streams and change the Encoding Strategy to "General". Be sure to save the settings in the camera with the requisite button. (see screenshot below)
Then to ensure everything is set, perform a reconnect from within Qumulex.