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To capture the last few minutes in OBS Studio, enable Replay Buffer in Settings → Output, choose a duration, assign a Save Replay Buffer hotkey under Settings → Hotkeys, and start the buffer before the moment you want to keep. When the moment has passed, press the save hotkey. Starting the buffer does not save a clip by itself.
Set up OBS Replay Buffer
- Choose where clips will go. In OBS, open Settings → Output and set the recording path to a folder you can find later. The available controls can vary with OBS version and output mode.
- Enable the buffer. In Settings → Output, enable Replay Buffer. Set its duration to how much footage you want to be able to recover before pressing Save Replay. Start with a practical, shorter duration; increase it only after checking that OBS remains stable on your computer.
- Assign hotkeys. Open Settings → Hotkeys. Set a key for Start Replay Buffer and a separate key for Save Replay Buffer. Pick keys you can reach reliably that do not conflict with game controls or other shortcuts.
- Start capturing before the action. Start the replay buffer using its hotkey or the corresponding OBS control. The buffer must already be running to retain footage from before the event.
- Save after the moment. Press the Save Replay Buffer hotkey. OBS writes the buffered segment as a clip to the configured recording location.
- Test the result. Start the buffer, wait briefly, save a replay, then find and play the file. Check that both video and audio are present and that the clip contains the expected portion before relying on it for an important recording.
Choose duration, quality, and file format carefully
Duration and memory use
Replay Buffer retains recent footage in system memory while active. A longer duration or more demanding output settings can increase resource use. There is no universal duration that fits every computer: test the settings you plan to use, and reduce the duration or output quality if the buffer will not start or OBS becomes unstable.
OBS Studio 29 release notes described a version-specific change: “The Replay Buffer’s memory limit is now set to 75% of installed system RAM rather than fixed to 8GB.” That is a change documented for OBS Studio 29 by the OBS Project in 2023, not a recommended allocation or a guarantee about every version. Check the behavior of the OBS version installed on your computer. OBS Studio 29 release notes.
Recording quality and encoder
The selected recording quality and encoder affect resource use. Available encoder options depend on your computer, so use the options shown in your OBS installation and test the resulting clip. If the system struggles, lower the output demands or shorten the buffer rather than assuming a specific encoder is available.
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#1 Best Overall
Capture Card, 4K HDMI Video Capture Card, Game Capture Card, 1080P 60FPS Video Capture Device, HDMI to USB 3.0 Capture Card for Streaming, Work with Camera/Xbox/PS4/PS5/PC/OBS
- 【1080P HD High Quality】Capture resolution up to 1080p for video source and it is ideal for all HDMI devices such as PS4, PS3, Xbox One, Xbox 360, Wii U, DVDs, DSLR, Camera, Security Camera and set top box. Note: Video input supports 4K30/60Hz and 1080p120/144Hz. Does not support 4K120Hz/144Hz. Output supports up to 2K30Hz.
- 【Plug and Play】No driver or external power supply required, true PnP. Once plugged in, the device is identified automatically as a webcam. Detect input and adjust output automatically. Won't occupy CPU, optional audio capture. No freeze with correct setting.
- 【Compatible with Multiple Systems】suitable for Windows and Mac OS. High speed USB 3.0 technology and superior low latency technology makes it easier for you to transmit live streaming to Twitch, Youtube, Facebook, Twitter, OBS, Potplayer and VLC.
- 【HDMI LOOP-OUT】Based on the high-speed USB 3.0 technology, it can capture one single channel HD HDMI video signal. There is no delay when you are playing game live.
- 【Support Mic-in for Commentary】Rybozen capture card has microphone input and you can use it to add external commentary when playing a game. Please note: it only accepts 3.5mm TRS standard microphone headset.
Recording path and format
Set a known recording path in Output settings and verify the actual Replay Buffer file format produced by your OBS version and configuration. OBS recommends MKV for recordings because a recording is less likely to be corrupted if it does not stop gracefully; that guidance does not mean every Replay Buffer setup necessarily produces MKV. Check the saved file in the player or editor you intend to use.
Why an OBS replay may not save
- No clip appears: Confirm that the buffer was started before the event, then press the Save Replay Buffer action rather than only starting or stopping the buffer.
- The wrong or no hotkey responds: Reopen Settings → Hotkeys and verify the assigned Save Replay Buffer key. Check for a conflict with another shortcut.
- You cannot find the clip: Check the recording path under Settings → Output, then save a short test replay and locate the resulting file.
- The buffer will not start or OBS becomes unstable: Shorten the replay duration or lower output demands, then test again. Memory and encoder use depend on the computer and settings.
- The clip has missing or unexpected audio/video: Play a test file before a session where the replay matters. Confirm the intended sources and audio are included in the output configuration, and check the saved file in another suitable player if needed.
Start Replay Buffer automatically when OBS launches
OBS documents the --startreplaybuffer launch parameter for starting the buffer when OBS opens. This automates buffer startup; it does not replace the Save Replay Buffer action needed to write a clip.
Rank #2
Guermok Video Capture Card, 4K USB3.0 HDMI to USB C, 1080P 60FPS & 2K 30FPS
- 【1080P 60FPS Video Capture Card】 This HDMI game capture card is based on USB3.0 high speed transmission port, input resolution up to 4K@30HZ, output resolution up to 2K@30Hz or 1920×1080@60Hz. Type c and USB interface can meet most of the devices in daily life. Easily meet the online capture, real-time recording, online meetings, live gaming and other functions, so you have a better visual enjoyment. Note: For capture use only; requires capture software to function and is not intended for direct screen casting to a monitor or TV
- 【Ultra Low Latency Screen Sharing】 HDMI capture card is made of good quality aluminum alloy with strong heat dissipation, allowing you to enjoy ultra low latency while live gaming or video recording or live streaming, avoiding blue screens and lag. This HDMI to USBC capture card supports easy recording of good quality audio or HD video and transferring it to your computer or streaming platform, allowing you to record 60 fps HD video directly on your hard drive and real-time preview
- 【Plug and Play, Easy to Carry】 This HDMI 1080P video capture card does not require any additional drivers or external power supply, just plug and play for fast capture. The capture card is small and lightweight, so you can put it in your bag for emergencies, making it very portable for outdoor live streaming. It's also a great way to share content in game recording, video conference, video recorder and online teaching
- 【Wide Compatibility USB Capture Card】 Easily streams to Facebook, Youtube or Twitch. With the connection, this HDMI to USB C/3.0 video capture devices can be working on several Operating Systems and various software: Windows 7/ 8/ 10, Mac OS or above, Linux, Android, Laptop, Xbox One, PS3/PS4/PS5, Camera, DVDs, Set Top Box, Webcame, DSLR, Switch/Switch 2, TV BOX, HDTV, Potplayer/VLC, ZOOM, OBS Studio etc.
- 【Package Content & Note】 1x HD Audio Capture Card , 1x USB 3.0 to USB C Adapter (A-side 3.0, B-side 2.0), 1x user manual. Please note that you need to restart the OBS Studio software after the audio setup is complete, otherwise it will result in no sound output. When using an adapter, if the device is recognized as USB 2.0, try using the other side with the USB-C port. Simply flip the capture card and reconnect it to be recognized as USB 3.0
- Windows: In the OBS shortcut properties, add
--startreplaybufferafter the executable path. For scheduled or automated launches, OBS’s guide says to set the working directory to the folder containingobs64.exe. - macOS: OBS documents passing launch parameters through an Automator workflow or Terminal.
Follow the OBS guide for the launch method and syntax for your platform: OBS launch parameters.
Use a keyboard hotkey or optional physical control
A keyboard hotkey is enough to start the buffer and save a replay; no additional hardware is required. A Stream Deck can be an optional dedicated physical control. An OBS forum guide describing this workflow dates from 2018, so confirm current model, plugin, and software compatibility before choosing a specific device. OBS forum guide to instant replay with Stream Deck.
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Rank #3
![VIXLW 4K HDMI Video Capture Card, Cam Link Card, HDMI to USB 2.0 Game Audio Adapter, Record Capture Device for Streaming, Teaching, Gaming, Live Broadcasting, Video Conference [Windows]](https://m.media-amazon.com/images/I/41e6jd88Y4L._SL160_.jpg)
VIXLW 4K HDMI Video Capture Card, Cam Link Card, HDMI to USB 2.0 Game Audio Adapter, Record Capture Device for Streaming, Teaching, Gaming, Live Broadcasting, Video Conference [Windows]
- 【4K VIDEO CAPTURE CARD】Made with upgraded chip, captures 4K@60Hz video input at full speed, no lag, no delay, capture card also supports 1920×1080@30Hz highest image quality output, capture video to USB through HDMI, you can Directly save to computer and mobile phone; suitable for high-definition video live broadcast, video capture, online conference, video streaming, video course; equipped with high-definition USB cable.
- 【HDMI real-time screen sharing】The HDMI interface is made of nano-metal material, so that the video can reach ultra-low latency. The audio and video capture card can capture video and audio at the same time, and store the video signal into the computer and smartphone, and support OBS post-video. Editor, this is an excellent solution for online meetings and live broadcasts, economical and fast, 4K HDMI Capture Card is widely used in live broadcast, conference, photography, medicine, daily office.
- 【Plug and Play】4K video capture card has built-in drivers, no need to install complicated programs, no external power supply, plug and play, very convenient, just plug into your computer, you can use it, the shell is made of aluminum alloy seamlessly , small size, very convenient to carry, suitable for capturing interesting details in life, can be used for indoor and outdoor live broadcast, and the color of the picture is more delicate.
- 【Wide Compatibility】The video capture card adopts advanced chips, intelligent identification equipment, and is widely compatible with electronic equipment, which can easily capture wonderful moments and comes with a USB cable. It supports third-party video capture software such as OBS, Win, MacOs, Android, etc. It can also perform video capture and online live broadcast at the same time, store and share videos at the same time, and easily realize video splicing, which is very convenient.
- 【24 hours local technical support】We have a professional technical team for more than ten years, serving you 24 hours a day. You are welcome to contact us if you have any questions.
Or let it run in the cloud
OBS Replay Buffer is for saving recent footage on your own computer. If your goal is instead to keep uploaded videos playing as a 24/7 YouTube livestream, StreamNeo runs that stream from the cloud. Upload a recording or build a playlist, add your YouTube stream key, and go live. Nothing has to stay on at home; uploaded video streams as made, up to 4K 60fps, at one price per slot; and StreamNeo automatically recovers if YouTube drops the stream. The first day is free with no card. Monthly is $9.99 per month. See StreamNeo, or start the free first day.
Quick Recap
Best Value
Capture Card 4K HDMI Video Streaming to USB 3.0 1080P 60FPS Capture Device
- High-Quality Video Capture, 4K HDMI Capture Card Ready: Capture smooth and vibrant video with this 4K HDMI capture card, engineered for gamers and content creators who demand crisp 1080P 60FPS video quality. Whether you're streaming to Twitch or recording gameplay for YouTube, your footage will look professional and detailed
- Plug-and-Play USB Capture Card, No Drivers Needed: Designed as a USB capture card for streaming, this device works instantly out of the box, just plug into your PC or laptop and start capturing. Fully compatible with popular software like OBS Studio, Streamlabs, and XSplit, making setup quick and stress-free for beginners and pros alike
- Universal Compatibility PS5, Xbox, Switch & More: Stream or record gameplay from virtually any HDMI-enabled device including Nintendo Switch, PS5, Xbox Series X, DSLR cameras, and PCs. The video capture card for gaming supports seamless passthrough so you can play without lag while your audience watches every frame in real time
- Low-Latency Performance for Smooth Streaming: This capture card for streaming minimizes delay between gameplay and broadcast, so you get reliable, low-latency capture that works well for competitive gaming, live broadcasts, and podcast sessions. Suitable for those building their channel with high-quality, engaging content
- Compact & Portable Design for Content Creators: Lightweight and portable, this USB 3.0 capture card works well for creators who travel or switch gaming setups often. Throw it in your bag and stream or record wherever you are, at home, events, LAN parties, streaming or studio sessions
Rank #4
Video Capture Card, 4K USB3.0 HDMI to USB C, 1080P60FPS HDMI Capture Card for Streaming, Gaming, Video Recording Compatible with Switch, Xbox, PS4/5, OBS,iPad Mac OS Windows,Camera, Zoom(Silver)
- 【4K HDMI Input, 2K@30Hz Recording】Powered by a true USB 3.0 high-speed interface, the capture card supports up to 4K@30Hz HDMI input and records at 2K@30Hz or 1080P@60Hz. Perfect for gamers, streamers, and professionals who need crisp, smooth video for live streaming, gameplay recording, or online meetings.
- 【Ultra Low Latency Screen Sharing】Built with a premium aluminum alloy shell and advanced chipset for stable heat dissipation, ensuring ultra-low latency transmission. Capture high-quality video and dual-channel audio in real time—no lag, no frame drop—ideal for Twitch, YouTube, or OBS streaming.
- 【Easy Plug and Play, Compact & Portable】No driver or external power required—just plug and play via USB 3.0 or Type-C connection to your Windows or macOS computer. Lightweight and compact design makes it easy to carry for outdoor streaming, live shows, or mobile recording setups.
- 【Wide Compatibility & Multi-Device Support】Compatible with Windows 7 8 10 11, macOS, Linux,Android and supports most popular software such as OBS, Zoom, VLC, Twitch Studio, and more. Works seamlessly with PS4, PS5, Xbox, Switch, DSLR cameras, TV boxes, and other HDMI-output devices for streaming to YouTube, Twitch, etc.
- 【What You Get】Includes: HDMI Capture Card, USB 3.0 to USB-C Adapter, User Manual. Tips: Make sure your tablet’s OTG function is enabled before connecting. Test your HDMI device with a monitor first to confirm video and audio output, then connect to the Video Capture Card for recording.
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