AVer DL10 Manuel page 40

Video & Audio
The user can set up Power Frequency, Video Mode, Stream Video Output, Bitrate, Encoding Type,
Framerate, I-VOP Interval (S), Rate Control, Noise Suppression, External Audio Input, Audio Volume,
and Sampling Rate.
3 types of video modes can be selected and each one only supports single function,
 Stream Only: Supports RTSP/RTMP only.
 USB Only (factory default): Supports USB port output only; not compatible with AVer PTZ
Management and PTZ Control Panel. Please switch to the other two modes if necessary.
 USB + Streaming: Supports both RTSP/RTMP and USB output at the same time.
[Note] If Video mode is in "Stream Only", the frame rate is up to 60fps; in "USB + Streaming" mode, the
frame rate is up to 30fps.
 Noise Suppression: For the built-in microphone, you can enable Noise Suppression. The
built-in microphone will then suppress all background sounds that isn't speech.
 External Audio Input: You can select Line In or MIC In.
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