How to set recording quality during recording (from high quality to low quality)
Note: This setting does not apply to external codecs. It applies only to oCamโs built-in codec.
Lowering the recording quality will reduce the size of the recorded video file, but the image quality will also become worse.
There is a menu at the top of oCam. Click Tools - Options, then click Encoding on the left, and you can select the video quality as shown below.
By default, it is set to Very High (high quality).
During recording, the video quality can be selected using the following levels.

Below are captured preview images showing recorded quality from Very High to Very Low.
Image source: http://www.mrwallpaper.com/rubber-duck-city-wallpaper/
Recorded in Very High
Recorded in High
Recorded in Medium
Recorded in Low
Recorded in Very Low

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How to Record Audio When Using a USB Audio Interface
This explains how to record audio that is played through a separately purchased USB audio device instead of through the built-in sound card.
For example, if the USB audio device you purchased is a Scarlett 2i2 USB,
click Sound in Control Panel.
When you click it, the window below will appear, and you will see the newly connected USB audio device in the Playback tab.
Select the USB audio device and click "Set Default".
You can then see that it has been set as the default device, as shown below.
Audio played by the system will now be output through that device, and when recording with oCam, the sound coming through that device will be recorded.