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How to Record Losslessly Using x264vfw
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Before getting started, you must install the x264 codec in advance. If you do not know how to install it, please refer to the Help section.
Click the Codec menu in oCam, then click the External Codec menu item.
Select Use External Codec, choose the x264vfw codec, and then click the Settings button.
Using the default x264vfw settings as a base, change the parts highlighted in the yellow box in the image below as shown.
The following settings need to be changed.
Preset - Ultrafast ( Set this to improve encoding speed. The file size may become larger, but if you choose other options, significant lag may occur. )
Profile - High 4:4:4 ( The default profile may cause quality loss, so change it to High 4:4:4 for lossless encoding. )
Keep input colorspace - Keeps the color space of the internally received input buffer. ( If you use other options, encoding may fail. )
Rate control - Single pass - lossless - Change this for lossless encoding.
Click the OK button to apply the settings.
When recording 64-bit games, the settings are applied to x264vfw64 for 64-bit, so run x264vfw - Configure x264vfw64 from the Start menu and configure it in the same way as shown above.
If you record with the above settings, the video will be recorded losslessly. One important point is that if you want to play back the lossless video without quality loss, you must change the settings in your video player.
Below is how to check a lossless video using PotPlayer.
Run PotPlayer, then click Preferences ( F5 ).
In the Preferences window,
click Video - Color Space/Attributes on the left, then in the Color Space group box on the right, select Convert manually if possible - Default output color space. ( If you do not configure this, even if the recording is lossless, the screen colors may still be altered during playback. )
Click OK, then play the video recorded losslessly.
At this point, press Ctrl + F1 in PotPlayer. As shown below, the output format of the video codec must be displayed as RGB(32 Bits).
Also, in the playback information under the File Information tab, the following properties must match as shown below.
Format profile : High 4:4:4 Predictive@L3
Color space : RGB
Color range : Full
Matrix coefficients : RGB
Please note that Windows Media Player does not play this properly, and preview thumbnails will not be displayed in Windows Explorer.
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Another helpful tip
Tips for Precisely Adjusting the Recording Area Window
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.