How to Use an External Codec - Xvid
Go to the official Xvid website.
Click Xvid Video - Downloas in the menu at the top right. ( Do not select Xvid Codec. )

Click the link below.
Click the Download button to download it.
This is the installation screen. Click OK right away.
The detailed explanation is omitted. Just keep clicking the Next button to continue.
If oCam is already running, restart it, then click the Codec button in the oCam main window and click the External Codec menu.
Then check the Use External Codec checkbox, and you will see that the newly added Xvid MPEG-4 Codec is available.
Select that codec.
Click the Settings button to configure the detailed options of the Xvid codec.

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When the recorded sound is muffled or too quiet (Windows XP)
When the recorded sound is muffled or too quiet (Windows XP)
Double-click the Sound and Audio Devices icon in Control Panel.
The Volume Control window will open, then click Properties under Options.
Select Recording, and in the volume control list below, check โStereo Mixโ and click OK.
If the sound is muffled, lower the Stereo Mix volume. If the sound is too quiet, increase the Stereo Mix volume.
Stereo Mix is a feature provided by the sound driver, so with some sound drivers, even if you increase the Stereo Mix volume, the sound may still be too quiet. In that case, increase the system volume as well.