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Even though using high resolutions (or ''Source'') increases quality of output video as the output becomes more similar to the source, it might cause [[Output#Frame_rate|fps]] drops. Size of the output also become larger in higher resolutions. You can choose lower resolutions to increase frame rate, reduce size of the output file and prevent performance issues.
====Limit====Screenbits supports resolutions up to ''3840 × 3840'' (also referred as ''4K'') unless you run x86 version of the app. However since recording in very high resolutions might cause performance issues which affect quality of the output video, Screenbits by default limits the output resolution to ''1920 × 1920''. To remove this limit, you need to turn '''Limit resolution to Full HD''' switch off from video settings. ===Scaling====
When using a resolution different than source, the aspect ratio of the output resolution might be different from the aspect ratio of the source of recording. By default, scaling mode is set to '''Aspect Ratio''' which means Screenbits maintains original aspect ratio of the recording source and adds black bars to the output if needed. Use the '''Scaling''' selector to change the scaling mode.
===Frame rate===
Recording in higher frame rates requires more system resources and also produces larger files so choosing correct frame rate based on your system performance and the use case is a key factor of using a screen recorder. Screenbits uses 30 as the default value for frame rate which is a good choice for many use cases such as making video tutorials and product demos.
There are two frame rate modes for recording, ''Variable frame rate'' and ''Constant frame rate''. To change the frame rate mode, click the selector under '''Frame rate mode''' and choose one of the available modes.
====Variable and Constant frame rate===
In variable mode, a frame is captured and added to the output video only if it is different from the previous frame, otherwise, it gets skipped. In contrast, when recording in constant frame rate mode, frames are added based on the frame rate only, regardless of the difference between them. So in a constant frame rate (''N'') video, there are exactly ''N'' frames per second while there are usually less frames in a variable frame rate video.
Using variable frame rate is recommended for screen recording as it improves recording performance and reduces size of the output file without affecting quality of the output video, however, some video editing software might not be compatible with this mode and have video/audio synchronizing issues with variable frame rate video.
====Fallback====
Recording in constant frame rate mode is not always possible depending on the frame rate and system performance. If the system does not perform good enough, Screenbits automatically switches to the variable frame rate mode to be able to continue recording. You can check [[Statistics]] section to see the actual frame rate mode current recording session.