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To capture a Linux desktop at 60 or 120 frames per second, first match the capture method to your display session: use FFmpeg’s x11grab on X11, or OBS Studio’s PipeWire screen source on Wayland. Set the frame rate before the input, choose a resolution and encoder your system can sustain, and verify dropped-frame counters while recording. A still-image extractor cannot create frames that were never captured.
What “high-FPS screenshots” means on Linux
A screenshot is normally one still image. When people ask for 60 or 120 FPS screenshots, they usually mean recording a desktop stream at that frame rate and then exporting individual frames. The workflow has two separate rates:
- Capture rate: how many desktop frames the recorder obtains each second.
- Extraction rate: how many images per second are written from the recording.
If you capture at 30 FPS, running an extractor with fps=120 only duplicates or interpolates timing; it cannot recover motion between the original frames. For genuine 120-FPS still sequences, the display capture, compositor, capture API, encoder, storage and extraction pipeline all need to sustain 120 frames per second.
Choose the backend for your session
Check your session type before choosing a command:
echo "$XDG_SESSION_TYPE"The result is normally x11 or wayland. The practical choices are:
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| Session and method | Best use | Selection | Trade-offs |
|---|---|---|---|
X11 with FFmpeg x11grab |
Scripted whole-display, region or window capture | Display or region coordinates; optional window ID | Simple and automatable; high resolution and FPS increase CPU/GPU and I/O load |
| X11 with OBS XSHM | Interactive recording with preview and statistics | Display or window source | More setup than a command; useful monitoring and scene controls |
| Wayland with OBS PipeWire/portal | Permission-aware desktop or window capture | Choose a screen/window through the portal | Requires compositor support and permission approval; settings depend on hardware and compositor |
Wayland or X11 with FFmpeg kmsgrab |
Advanced low-level DRM/KMS capture | Connector and device mapping | Permission-sensitive and hardware-specific; not the default desktop workflow |
Traditional X11 grabbing is not a general Wayland solution. Wayland intentionally controls cross-client capture, so use a PipeWire-based portal path unless you specifically understand your compositor’s KMS setup.
Capture 60 or 120 FPS on X11 with FFmpeg
Install and confirm FFmpeg
Install the FFmpeg package supplied by your Linux distribution, then check that the executable is available:
ffmpeg -versionOn X11, DISPLAY identifies the display (for example, :0.0). The x11grab device captures a region of an X11 display. Put -framerate before the input specification so it applies to capture rather than only to an output filter.
Whole-display baseline
ffmpeg -f x11grab -framerate 60 -video_size 1920x1080 -i "$DISPLAY" -c:v libx264 -preset veryfast capture.mkvReplace 1920x1080 with the actual region you intend to capture. Press q in the terminal to stop cleanly. For 120 FPS, change -framerate 60 to -framerate 120 only after confirming that your display, desktop and machine can sustain that rate.
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Capture a region
Add an +x,y offset to the display input. This example captures a 1280×720 rectangle beginning 320 pixels from the left and 180 pixels from the top:
ffmpeg -f x11grab -framerate 120 -video_size 1280x720 -i "$DISPLAY+320,180" -c:v libx264 -preset veryfast region-120.mkvUse coordinates that fit the target monitor and desktop layout. A smaller region is often the most effective way to keep a high frame rate while preserving a lossless or visually clean workflow.
Capture one X11 window
If you know the X11 window ID, pass it with -window_id. You can obtain IDs with an X11 utility such as xwininfo, then select the window interactively:
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ffmpeg -f x11grab -framerate 60 -window_id 0x4600007 -i "$DISPLAY" -c:v libx264 -preset veryfast window.mkvWindow capture is an X11 capability; it does not provide a portable way to select arbitrary Wayland windows.
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Encoder and pixel-format choices
libx264 with the veryfast preset is a reasonable baseline, not a guaranteed performance setting. If FFmpeg reports that the capture loop is falling behind, reduce resolution or frame rate, use a faster encoder available on your system, or choose a hardware encoder exposed by your FFmpeg build. Faster encoding generally trades compression efficiency for lower latency and CPU use. Keep the recording container timestamped; Matroska (.mkv) is a resilient choice while testing.
Extract high-FPS still images from a recording
After recording, create a directory and extract frames at the rate actually captured:
mkdir -p frames
ffmpeg -i capture.mkv -vf "fps=60" -vsync 0 frames/frame_%06d.pngFor a 120-FPS recording, use -vf "fps=120". PNG preserves the decoded frame without JPEG compression, but it creates large files and can become the storage bottleneck. If exact timing matters, retain the original video and its timestamps in addition to exported images. A 120-FPS request against a 60-FPS source cannot produce 120 unique moments.
Capture high FPS on Wayland with OBS Studio
Use the PipeWire screen or window source
- Start OBS Studio in your Wayland session.
- Open Settings → Video.
- Set Common FPS Values to the target supported by your compositor and hardware, such as 60 or 120.
- In the Sources dock, click + and choose Screen Capture (PipeWire) (the exact label can vary with the OBS package).
- Choose the display or window in the desktop portal dialog and approve the share request.
- Set the output resolution to the region you need, then choose a recording format that preserves frame timestamps.
- Start recording and watch the OBS statistics panel for dropped frames, rendering lag and encoding lag.
OBS documents PipeWire screen capture as a Linux source that requires Wayland. On X11, OBS also provides Screen Capture (XSHM) and window-capture sources; select those instead of PipeWire when the session is X11.
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When KMS capture is appropriate
FFmpeg’s kmsgrab can capture from the Linux DRM/KMS interface when the compositor and hardware expose a usable path. It may require device permissions, connector selection and hardware-aware format mapping. Treat it as an advanced option for controlled systems, not as the first choice for an ordinary desktop or laptop. A misconfigured KMS command can fail before producing any frames, even when OBS can capture successfully.
Make 60/120 FPS sustainable
Match the display and region
- Confirm that the monitor and compositor are actually running at the target refresh rate; a 60-Hz output cannot provide 120 distinct display updates.
- Capture only the monitor, window or rectangle needed. Full 4K at 120 FPS is far more demanding than 1080p at 60 FPS.
- Keep width and height aligned with the encoder’s requirements. Odd dimensions can force conversions or fail with some hardware encoders.
Control processing and storage
- Choose a pixel format and encoder that your CPU or GPU can process in real time.
- Write to a fast local disk while recording; exporting thousands of PNGs can saturate storage even after capture succeeds.
- Close unnecessary GPU-heavy applications and avoid running a preview at a larger size than the recording.
- For long captures, monitor disk space. High-FPS lossless images consume space rapidly.
Verify rather than assume
Watch FFmpeg’s reported frame and drop counters during capture. In OBS, open the statistics view and check for dropped frames, rendering lag and encoding lag. These are operational checks, not a promise that a particular machine will achieve a particular rate. Test the exact resolution, desktop effects, application and encoder you plan to use.
Common failures and fixes
| Symptom | Likely cause | Fix |
|---|---|---|
Cannot open display or an empty X11 capture |
DISPLAY is unset, points to another display, or the process lacks X11 access |
Run echo "$DISPLAY" in the graphical session, use the correct display such as :0.0, and run the command as the logged-in desktop user. |
| FFmpeg says the input cannot be initialized on Wayland | x11grab is being used against a Wayland session |
Use OBS PipeWire/portal capture, or investigate KMS only if you control the DRM setup. |
| Frames are dropped during recording | Capture, encoding or disk throughput is insufficient | Lower resolution or FPS, reduce the region, select a faster encoder, or record to faster local storage. |
| Output has fewer unique frames than requested | The source or capture loop delivered fewer frames | Inspect counters and timestamps; extraction cannot invent missing frames. |
| OBS portal shows no screen or window | Portal/compositor integration or permission selection failed | Retry the source, approve the portal dialog, update the desktop/portal packages, and test a different source type supported by the session. |
| Recording stops or the file is unusable after a crash | The container was not finalized | Stop with OBS’s Stop Recording button or FFmpeg’s q where possible; use Matroska while testing and keep temporary files until verified. |
| PNG extraction is too slow | Image encoding or disk writes are the bottleneck | Extract a smaller region, use a faster intermediate format, write to a fast disk, or export only the frame range you need. |
Plan for timing, cursors and windows
Decide whether you need the cursor, a whole display or a single application before recording. X11 tools expose region offsets and window IDs; OBS lets you choose a display or window through its source and portal flow. Cursor behavior and exact timestamp fidelity vary by backend and compositor, so preserve the original recording when frame timing is part of an analysis, benchmark or animation workflow. If you need reproducible captures, record the session type, display size, target FPS, encoder, pixel format and capture region alongside the files.
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For a web page rather than a live Linux desktop, ScreenshotNeo provides a single HTTP request for a PNG, JPEG, WebP or PDF. It is not a replacement for capturing a game or desktop animation at 120 FPS, but it avoids maintaining a browser, display server and compositor when you need repeatable website images.
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High-FPS capture checklist
- Run
echo "$XDG_SESSION_TYPE"and identify X11 or Wayland. - Select
x11grab/OBS XSHM for X11, or OBS PipeWire for Wayland. - Set capture FPS before the FFmpeg input, or set OBS’s video FPS before recording.
- Choose the smallest practical region and a sustainable encoder.
- Monitor dropped-frame, rendering and encoding counters.
- Keep the original timestamped recording, then extract PNGs or another suitable still format.
Frequently Asked Questions
Can I capture 120 FPS if my monitor is set to 60 Hz?
No. The capture path cannot obtain 120 distinct display updates from a 60-Hz output. You can request 120 in software, but the resulting sequence will not contain 120 unique screen moments per second.
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Not as a general desktop method. Wayland controls cross-client capture; use OBS’s PipeWire/portal source or a deliberately configured KMS workflow.
Should I save every frame as PNG while recording?
Usually no. Record a timestamped video first, then extract the required frame range. Simultaneous lossless image writes can become the storage bottleneck.
How do I preserve exact frame timing for analysis?
Keep the original recording and its timestamps, document the capture settings, and avoid relying only on a numbered image sequence.
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