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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What to Do If the "Failed to url_fopen" Error Message Appears and Recording Does Not Start
When creating a recording file in oCam, an error may occur if the file cannot be saved to the save path specified by the user. This issue is usually caused by access permissions for the save path or an incorrect path setting. Below is a detailed explanation of how to change the save path to resolve this problem.
To fix the recording file save error, the most effective method is to change oCam's save path to a different location. Please follow the steps below:
1. In the oCam main window, click 'Tools' in the top menu, then select 'Options'.
2. When the Settings window opens, click the 'Save' category in the left menu.
3. In the 'Save' tab, find the 'Save Path' item, check the currently configured path, and change it to a new location.
4. After making the change, click the 'OK' button to save the settings.
By default, it is recommended to set the save path to the Desktop. The Desktop generally has the access permissions needed for all programs to create files, so save errors are less likely to occur. For example, if you set the Desktop path to `C:\Users\[User Name]\Desktop`, in most cases the recording file will be saved without errors.
After changing the save path, restart oCam and try recording again to check whether the problem has been resolved. If the issue continues, it is also a good idea to check whether the selected folder has write permission and whether there is enough disk space.