0.5.6: silent crash during recording on Windows 11 (0xc0000005, mostly ntdll.dll) - recording lost, no error shown

まず、Windows 11 で画面とマイクの録画を一時停止したときにクラッシュを再現し、次に Cap logs と Windows Event Log のエントリを調べてアクセス違反を確認します。録画が暗黙に終了せず、project-config.json とともに録画が確定され、シャットダウンに失敗した場合にエラーが通知されれば完了です。

Summary

Since updating to 0.5.6 (released Jul 17), Cap crashes silently mid-recording on Windows 11. The recording indicator/tray simply disappears, no error dialog is shown, and the recording is lost (the .cap folder is left without project-config.json, only orphaned DASH segments). Before 0.5.6 the same setup was stable for weeks of daily recordings.

What triggers it

• Most reliably: pressing Pause during a recording (reproduced several times).
• But it also dies spontaneously during recording with no interaction at all — we only noticed because the recording indicator was gone.

Windows Event Log evidence

7 APPCRASH events on Jul 18 alone, all Cap.exe 0.5.6.0 (timestamp 0x6a4edb0e), exception code 0xc0000005 (access violation):

Cap's own logs end abruptly mid-recording (no "pipeline shutdown" / teardown lines), consistent with a hard process crash. The ntdll offsets (heap paths) at multiple distinct addresses suggest heap corruption rather than a single bad call site.

Environment

• Cap 0.5.6.0 (desktop, installed via .exe), path C:\Users\<user>\AppData\Local\Cap\Cap.exe
• Windows 11 Home, build 26200
• Recording: screen + mic, DASH segments visible in %APPDATA%\so.cap.desktop\recordings\

Additional note

Older releases on GitHub currently have no installer assets attached, so downgrading as a workaround isn't possible. If you could attach a 0.5.5 (or last-known-good) Windows installer to a release, that would help affected users a lot while this is investigated.

Happy to provide full logs or the WER report IDs if useful.