CamStudio V3 Changelog
A complete history of CamStudio V3 updates, enhancements, and bug fixes.
Version 3.1 Beta
February 17 to March 8, 2026Beta Overview
This beta section covers the work added between February 17 and March 8, 2026. Most of the changes are under the hood: more control over how recordings start and stop, more flexible audio routing, stronger finalize behavior under load, and far better diagnostics when something misbehaves.
Recording Control And Automation
- Added pause and resume recording with a dedicated hotkey, matching Settings control, and proper paused-state handling in the recording timeline.
- Added delayed start controls and a visible countdown overlay, so scheduled starts show up on the capture target instead of only in tray text.
- Added one-shot command-line capture with mode, duration, output, minimize, and separate system/microphone audio toggles for scripting and automated runs.
- Added quality presets that drive the existing width, height, framerate, and bitrate controls instead of creating a separate recording path.
Audio And Capture Pipeline
- Decoupled microphone and system/application audio, so recordings can now run as microphone-only, system-only, both together, or with no audio at all.
- Added microphone device selection and gain control, then aligned microphone capture format to the active system format for more reliable live mixing.
- Reworked mixed-audio timing so the output track follows a continuous timeline instead of jumping between device timestamps.
- Moved live audio buffering onto owned Media Foundation buffers, increased drain headroom, and tightened retry behavior when the encoder temporarily stops accepting audio.
- Single-track mixed microphone plus system audio is much better than before, but some wired headset and inline-mic setups can still produce mild residual crackle.
Stability, Finalization, And Diagnostics
- Moved more encode work off the UI thread, ran frame callbacks on a background dispatcher, and added dedicated locking around frame and timer encoder access.
- Improved recovery during frame stalls by writing duplicate last-frame samples, adding wall-clock stop fallbacks, and backing off maintenance writes when real frames are still arriving.
- Hardened stop and finalize behavior for Chrome and YouTube stress cases by tracking real in-flight video work and quiescing background encode activity before shutdown waits.
- Recordings now finalize through temporary .tmp.mp4 files before being renamed, which reduces corruption risk if a run is interrupted.
- Added persistent .diag.txt diagnostics plus run and stop trace files, which makes shutdown-stage and mixed-audio issues much easier to isolate.
Platform, Packaging, And App Integration
- Started the user-facing rebrand from wcap to CamStudio, including the executable name, icons, window class naming, and configuration section naming.
- Kept migration compatibility in place by falling back to legacy wcap INI names and sections when newer CamStudio settings files are missing.
- Added a built-in asynchronous update check using latest.txt, with validation, error handling, and an update dialog inside Settings.
- Improved startup safety with output-folder write preflight checks, automatic folder creation when possible, and clearer error messaging for protected folders such as OneDrive-controlled locations.
- Refreshed the About and Donate dialogs so the beta has more complete project metadata, version messaging, and support options.
Current Beta Notes
- Microphone-only and application/system-audio-only recording paths are now behaving reliably in current testing.
- Combined microphone plus system capture is stable enough to use, but single-track mixed audio can still produce light crackle on some hardware combinations.
- If you want the non-technical summary, the 3.1 beta overview page covers the same release in plainer language.
Version 3.0.0
March 8, 2025Important Note
CamStudio 3.0 represents a complete rebuild with a modern capture engine based on Windows Graphics Capture API. This version requires Windows 10 version 1903 (May 2019 Update) or newer.
New Features
- Entirely new capture engine using Windows.Graphics.Capture API for dramatically improved performance
- Hardware-accelerated video encoding via GPU for minimal CPU usage:
- Support for dedicated GPU selection
- Fallback to software encoding available
- Support for multiple video codecs: H264/AVC, H265/HEVC, and AV1
- 10-bit color depth support for HEVC and AV1 codecs
- Enhanced audio capture capabilities:
- Application-specific audio capture (record only the app you're capturing)
- System-wide audio capture option
- AAC and FLAC audio encoding options
- Configurable audio bitrate, samplerate, and channel count
- New intuitive keyboard shortcuts:
- Ctrl + F9: Capture entire monitor
- Ctrl + Win + F9: Capture active window
- Ctrl + Shift + F9: Capture custom region
- Improved window capture options:
- Option to capture only client area or entire window with borders
- Support for Windows 11 rounded corners (toggleable)
- Option to hide recording indicator border
- Comprehensive output control:
- Configurable output directory
- "Open when finished" option
- Recording limits by duration (seconds) or file size (MB)
- Support for fragmented MP4 format for crash-proof recordings
- Advanced video processing:
- Resolution limiting with aspect ratio preservation
- Framerate control with maximum FPS setting
- Bitrate management for both video and audio
- Gamma-correct resizing option
- Improved color conversion for better RGB to YUV mapping
System Requirements
- Windows 10 version 1903 (May 2019 Update) or newer
- For hardware acceleration: GPU with DirectX 11 support and updated drivers
- For HEVC and AV1 encoding: Compatible GPU with driver support or HEVC Video Extensions from Microsoft Store
- 4GB RAM minimum (8GB recommended)
- 500MB free disk space (plus space for recordings)
Improvements
- Significantly lower CPU and memory usage compared to previous versions
- More efficient video encoding resulting in smaller file sizes at the same quality
- Minimalist user interface focused on simplicity and usability
- Default settings optimized for high-quality capture (1080p60, 8Mbps bitrate)
- Better handling of high DPI displays and scaling
Known Issues
- Currently unable to record microphone audio - investigation underway
- Some antivirus software may trigger false positive detections
- HEVC encoding in software mode requires HEVC Video Extensions from Microsoft Store
- Older GPUs may produce lower quality output when using hardware encoding
- Custom regions cannot be saved or reused between recording sessions