ThePendulum
eb7c1aa500
- Preview Sync button builds a short (8s) lossless clip around the marked events with the current offset applied, and plays it in a small popup PreviewDialog (its own independent PlayerWidget/mpv instance) -- lets you check the fix sounds/looks right before committing to a full export. ExportWorker gained optional clip_start/clip_duration so both the real export and this preview share the same underlying export_synced() call. - Detect All Claps is back as a button in the Sync markers panel (alongside Mark Audio/Video Event), in addition to staying in the Tools menu -- both widgets' enabled state are kept in sync. - Sync markers panel now shows Mark Audio Event before Mark Video Event. The clip-mode branch of ffmpeg_export.py (the -ss/-t-on-both-inputs path ffdelay's own notes flag as easy to get subtly wrong) hadn't been covered by the existing roundtrip test, which only exercised full-file export -- added a clip-mode case there, independently verified via the same scene-change/silence-detection technique as the other cases: 29.4ms drift after the fix, well under one frame. All of this was built and verified entirely on a virtual Xvfb display (DISPLAY=:99) per the user's request to stop interrupting their real desktop -- real mouse clicks and a real (non-monkeypatched) preview dialog were exercised there, screenshotted, and confirmed correct, without ever touching the real screen.