OBS Close File When Inactive Explained
In OBS Studio, the “Close file when inactive” option is a performance-saving setting for media sources that unloads video and audio files from your system’s memory when they are not actively being displayed. This article covers exactly how this feature works, how it helps reduce RAM and CPU usage, and the trade-offs you should consider before enabling it for your live streams or recordings.
How “Close File When Inactive” Works
When you add a media source (such as an MP4 video overlay, a stinger transition, or a background music track) to OBS Studio, the software typically keeps that file pre-loaded in your computer’s RAM. This ensures that the moment you switch to a scene containing that media, it plays instantly without any delay.
When you check the “Close file when inactive” box in the media source properties, you instruct OBS to completely close the file and release it from your system’s memory whenever the source is hidden. This happens when you switch to a different scene or manually toggle the visibility icon (the eye icon) off.
How It Saves System Memory and Resources
- Reduces RAM Usage: Video files, especially those in high resolution (1080p or 4K) or high bitrates, can occupy hundreds of megabytes of RAM. Enabling this option frees up that memory to be used by your operating system, games, or other demanding applications.
- Lowers CPU and GPU Overhead: Keeping multiple media files “hot” and ready in the background requires continuous background processing. Closing inactive files reduces the background workload on your hardware, lowering the risk of dropped frames or encoding lag.
When to Enable This Option
You should enable “Close file when inactive” if: * You have limited system RAM: If your streaming PC has 8GB or 16GB of RAM and you run resource-heavy games alongside OBS. * You use many large media files: If your stream setup features dozens of different scenes with unique video backgrounds or long video clips that are only played occasionally. * You experience performance degradation: If your system struggles with high resource usage during long streams.
When to Keep This Option Disabled
You should leave this option unchecked if: * You need instant playback: Because OBS must reload the file from your storage drive (SSD or HDD) when it becomes active again, there may be a split-second delay, a brief freeze, or a black frame when switching to the scene. * Your media files are very small: For small, optimized webm files or short audio alerts, the memory savings are negligible, and keeping them pre-loaded ensures seamless transitions.