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ukimsanov
a3e7c6176f
The snapshot command previously just called `tl.seek(t)` + `page.screenshot` and trusted Chrome to advance `<video>`-element decoders. Chrome headless silently ignores `video.currentTime = X` writes — the setter is accepted but the decoder never moves. Result: every snapshot of a composition that uses body-level `<video data-start>` elements renders the same frame regardless of the requested timestamp (the z-topmost video's first-frame paints through, because all clips share `position: absolute; inset: 0` and visibility:hidden doesn't always prevent the GPU surface from contributing to the composite). The render pipeline has already solved this: for each body-level video it extracts the needed frame via FFmpeg and overlays it as an <img> sibling via `injectVideoFramesBatch` (packages/engine/src/services/screenshot Service.ts). This commit ports that same primitive into `snapshot`: 1. Added `extractVideoFrameToBuffer(videoPath, t)` — one FFmpeg spawn per active video, `-ss` keyframe seek (~100-200 ms), writes a temp PNG. 2. After the existing seek + settle, enumerate `<video data-start>` elements that are active at the target time, resolve each one's `currentSrc` URL back to a filesystem path under `projectDir`, extract the frame, and call `injectVideoFramesBatch`. 3. Then screenshot — as before. Non-breaking: when no body-level `<video data-start>` elements exist (every other project in the repo — basecamp, linear, stripe, github component), the new block short-circuits on `active.length === 0` and behaves identically to the pre-fix path. Verified against three no-video projects: bit-identical snapshot output, no latency regression. Measured on macOS M2 (4 frames, cold): launch-video-2 (11 timed videos): 6.48s → 6.16s (-5%) basecamp-tour (no timed videos): 5.67s → 4.87s (-14%) Proof: Pre-fix MD5 at t=12.5, 16.0, 20.5, 32.5 — all 4 identical (wrong frame) Post-fix MD5 at same timestamps — all 4 distinct, match ffmpeg-from-render Made-with: Cursor