Tips for Precisely Adjusting the Recording Area Window

Using oCam at work or school? A license is required, and it removes all ads, including this window. See the paid version →

Tips for precisely adjusting the recording area window


When setting the recording area in oCam, being able to precisely adjust the position and size of the window is very useful. oCam provides intuitive shortcut keys for this, allowing users to fine-tune the recording area exactly as needed. Below are some tips for precisely adjusting the recording area window and how to use the shortcut keys.


In oCam, you can drag the window used to set the recording area with the mouse to move or resize it, but using shortcut keys allows for much more precise adjustment. Shortcut keys are especially useful when you need to set an exact position or size.


Adjusting the recording area position  

- Arrow keys: Press the arrow keys (up, down, left, right) to move the recording area window precisely one pixel at a time. This is useful when fine adjustment is needed.  

- Ctrl + Arrow keys: If you want to move it by a larger amount, use the arrow keys while holding down the Ctrl key. This combination moves the window more quickly, making it easier to adjust the position efficiently.


Adjusting the recording area size  

- Shift + Arrow keys: Hold down the Shift key and use the arrow keys to resize the recording area window. The up and down arrow keys adjust the height of the window, and the left and right arrow keys adjust the width. This also allows precise adjustment one pixel at a time.  

- Shift + Ctrl + Arrow keys: If you want to resize the window by a larger amount, use the arrow keys while holding down both the Shift and Ctrl keys. This combination changes the window size more quickly in larger increments, which is useful when major resizing is needed.


These shortcut keys help you adjust oCam's recording area settings very precisely and carefully. For example, if you want to record only a specific game window or a certain part of the screen, you can first set the approximate area with the mouse and then use the shortcut keys to fine-tune it pixel by pixel for the exact result you want.


In this way, oCam provides user-friendly shortcut keys that support precise adjustment of the recording area. Make active use of these shortcut keys to set the recording area more accurately and efficiently.

Another helpful tip

How to Reduce the Size of Recorded Video Files When Recording Games (NVIDIA Codec)

If you are using the NVIDIA NVENC H.264 codec by default, the recorded file size may be very large.


Click the Codec menu in oCam to check whether you are using the NVENC H.264 codec, as shown below.

In the oCam Codec menu, click Hardware Encoder Settings.

The Hardware Encoder Settings window will appear as shown below. You can reduce the size of the recorded video file by changing the options highlighted in the yellow box.

First, let's look at how to reduce the size of the recorded file using variable bitrate.

( Rate Control must be set to 1-PASS VBR. )


The Quantizer value can be set from 1 to 51.

The lower the Quantizer value, the better the video quality, and the higher the Quantizer value, the lower the video quality.

In other words, the recording quality is defined by the range from the minimum Quantizer value to the maximum Quantizer value.


For example, 

If the minimum Quantizer value is 1 and the maximum Quantizer value is 13, the recording quality range is 1 to 13.

If the minimum Quantizer value is 1 and the maximum Quantizer value is 51, the recording quality range is 1 to 51.

If the minimum Quantizer value is 13 and the maximum Quantizer value is 51, the recording quality range is 13 to 51.

In conclusion, to reduce the size of a recorded video file, increasing the minimum and maximum Quantizer values will lower the recording quality and reduce the file size.


You can adjust the Quantizer values depending on your needs, as follows.

If you want to maintain the highest recording quality while lowering the quality at certain points to reduce the size of the recorded video, set the minimum Quantizer value to 1 and set the maximum Quantizer value to a higher number depending on how much you want to reduce the quality.

( Example: Minimum Quantizer: 1, Maximum Quantizer: 30 )


If you want to maintain medium quality while lowering the quality as much as possible at certain points to reduce the size of the recorded video, set the minimum Quantizer to 26 and the maximum Quantizer value to 51.

For reference, the minimum Quantizer value cannot be greater than the maximum Quantizer value.

That is, the minimum Quantizer value <= the maximum Quantizer value.


Caution: If you set both the minimum Quantizer value and the maximum Quantizer value to 1, the recorded video file size will become extremely large, so do not use this setting.

The default values in oCam are a minimum Quantizer value of 1 and a maximum Quantizer value of 13, and we recommend setting them within the following range.

Minimum Quantizer >= 1 and Maximum Quantizer value >= 13


Next is how to reduce the size of the recorded video file using constant bitrate.

Change Rate Control to 1-PASS CBR and then set the average bitrate.



The higher the average bitrate, the better the video quality. The lower the bitrate, the lower the video quality and the smaller the recorded file size.


Finally, there is a method that uses a fixed Quantizer parameter.

Set Rate Control to 1-PASS Fixed Quantizer Parameter.



Unlike VBR, there is no concept of minimum and maximum Quantizer values, and the quality is set using a fixed Quantizer value.