When I download a file on my Dahua NVR in either format .asf or .dav and convert them to edit as .mp4 files, they either are not recognized as media files or they are converted but have no audio but video is fine. In the settings menu on the Web Service GUI what should the audio encode settings be? They are by default set to AAC and 48k is this correct? When I use PSS and enable the audio I can clearly hear the audio on the live preview.