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## Summary - Fixes SaveWebM node showing "Error loading image" in Vue nodes mode - Extracts `isAnimatedOutput`/`isVideoOutput` utility functions from inline logic in `unsafeUpdatePreviews` so both the litegraph canvas renderer and Vue nodes renderer can detect video output directly from execution data - Uses output-based detection in `imagePreviewStore.isImageOutputs` to avoid applying image preview format conversion to video files ## Background In Vue nodes mode, `nodeMedia` relied on `node.previewMediaType` to determine if output is video. This property is only set via `onDrawBackground` → `unsafeUpdatePreviews` in the litegraph canvas path, which doesn't run in Vue nodes mode. This caused webm output to render via `<img>` instead of `<video>`. ## Before https://github.com/user-attachments/assets/36f8a033-0021-4351-8f82-d19e3faa80c2 ## After https://github.com/user-attachments/assets/6558d261-d70e-4968-9637-6c24532e23ac ## Test plan - [x] `pnpm typecheck` passes - [x] `pnpm lint` passes - [x] `pnpm test:unit` passes (4500 tests) ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-8943-fix-detect-video-output-from-data-in-Vue-nodes-mode-30a6d73d365081e98e91d6d1dcc88785) by [Unito](https://www.unito.io) --------- Co-authored-by: github-actions <github-actions@github.com>