FAQ (36)

How to Record Losslessly Using x264vfw

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.


Today's News/Tips

oCam Advanced Settings - Recording - General Tab


 

oCam is a powerful program that provides a wide range of settings related to screen recording, allowing users to optimize the recording environment as they want. In particular, when you click "Tools - Options" in the oCam menu, a detailed settings window appears, and under the "Recording - General" tab, you can adjust several important options related to recording. Below is a detailed explanation of the main settings included in this tab. Each setting can be flexibly adjusted according to the user's recording purpose and is designed to be easy to use for everyone from beginners to IT professionals.


Include Cursor in Recording

The "Include cursor in recording" option is enabled by default. When this setting is active, the mouse cursor will appear in the recorded video. This is useful when you need to visually show mouse movement, such as in lecture videos or software tutorials. On the other hand, if you do not want the cursor to appear in the video, simply uncheck this option. For example, if the cursor is unnecessary when recording gameplay footage or certain screen transitions, disabling this setting can help produce a cleaner result.



Hide the Drag Cursor in the Recording Area

The "Hide the drag cursor in the recording area" option is disabled by default. When this setting is turned off, the drag cursor that appears in the center of the screen when selecting the recording area will remain visible. This cursor serves as a visual guide to help users intuitively adjust the recording area. However, if you find this cursor distracting during recording setup or prefer a cleaner interface, you can enable this option to hide it. This setting does not directly affect the recorded video itself and is focused on adjusting convenience during the recording area setup process.


Make the Recording Area Follow the Mouse Cursor During Recording

The "Make the recording area follow the mouse cursor during recording" option is disabled by default. When enabled, the recording area does not stay fixed but instead moves in real time centered around the mouse cursor. This feature is very useful in situations where you need to continuously capture a specific area based on mouse movement, such as recording a dynamic software interface or emphasizing mouse-centered workflow. On the other hand, if you need to record a fixed screen area, it is better to leave this option disabled to maintain a stable recording region.


Frames Per Second (FPS)

The "Frames Per Second (FPS)" setting is an important factor that determines how smooth the recorded video will be. The default value is set to 30 FPS, which is suitable for general screen recording. oCam supports up to 120 FPS, so when recording high-performance games or fast-changing screens, it is recommended to set it to 60 FPS or higher. For example, in racing or action games where screen changes are fast, a higher FPS setting provides smoother and more natural video. However, if you use some built-in codecs such as MPEG-1 or MPEG-2, the FPS setting may be ignored and fixed at 30 FPS, so this should be kept in mind when choosing a codec.


Keyframe Interval

The "Keyframe Interval" setting controls how often keyframes are created during video compression. The default value is 5, which means a keyframe is created every 5 seconds. If you set it to 1, a keyframe is created every second, and if you set it to 2, one is created every 2 seconds. The shorter the keyframe interval, the more precise cut editing becomes during video editing, but file size may increase. On the other hand, a longer interval reduces file size, but there may be a slight loss of quality during playback or editing. This setting should be adjusted with a balance between video quality and file size in mind.


Decoder Resolution Compatibility

The "Decoder Resolution Compatibility" option is designed to resolve compatibility issues that may occur in certain video players during playback. Some video players, such as GOM Player, may display videos blurry if they do not meet specific resolution alignment rules. To prevent this, oCam automatically adjusts the horizontal resolution of the recording area to a multiple of 8 and the vertical resolution to a multiple of 4 by default. For example, if the user specifies a recording area of 427x241, since 427 is not divisible by 8, it will be adjusted to 424, and since 241 is not divisible by 4, it will be adjusted to 240. The final recording resolution will therefore become 424x240. This setting helps ensure video compatibility and supports stable playback across different players.


Usage Tips

If you adjust the settings in the "Recording - General" tab according to your recording purpose, you can get more effective results. For example, when creating lecture videos, it is a good idea to include the cursor and keep FPS at 30 for a natural-looking recording. On the other hand, when recording high-performance games, it is important to increase FPS and adjust the keyframe interval properly to balance quality and file size. In addition, the decoder resolution compatibility setting helps ensure that videos play correctly across different platforms. These detailed settings in oCam are very helpful for producing high-quality recordings tailored to your needs.


The "Recording - General" tab in oCam provides intuitive yet powerful features, allowing beginners to adjust settings easily while giving IT professionals the ability to fine-tune details for optimal results. Try using these settings according to your recording environment.

OhSoft - secretfolder The File Appears to Be Encrypted
oCam - howto How to Record Gameplay