Video Annotation - Annotating
Introduction
Video data in Flywheel eligible for annotating with CVAT is automatically prepared and synced for annotation, after which the CVAT Annotation UI can be used.
Instruction Steps
Note
"View File Contents in Web UI" project permission is required to access the Annotation UI - including Site Admin users within "Manage Site Mode".
Launching the Annotation UI
Video files that are eligible for annotation (according to your project settings) will be ready to annotate soon after they are added to an Acquisition in your Flywheel project. The status of their readiness is denoted by an icon next to the file type column in the Web UI.
| Icon | Meaning |
|---|---|
| Empty | The Flywheel system has not yet initiated the sync with CVAT |
| Syncing | Flywheel has initiated the sync with CVAT, but it has not completed successfully |
| Synced | The sync to CVAT has completed successfully, and the video file is ready to annotate |
| Error | The sync to CVAT has failed. Verify your video file is supported |
Info
If using the Flywheel SDK or API directly, the status is denoted by the file.cvat.sync_status field.
Once the file is ready to annotate, you can enter the Annotation UI by either:
- clicking on the Launch in CVAT icon next to the green check mark
- selecting Launch in CVAT from the file's action menu
Using the Annotation UI
Adding Annotations
Here are some CVAT guides to get started with their annotation UI.
CVAT Guide for Single Shape Annotation
Saving
CVAT will auto-save any changes you have made to your annotations every 30 seconds. If you try and close the browser tab you will be prompted to save any unsaved changes.
To manually save your changes, click the Save Icon in the top control bar.
Usage Notes
- Many keyboard shortcuts are available. Use the
F1key on your keyboard to view the available shortcuts. - The video playback feature may stutter to load more frame data when used with 4k or higher resolution videos, or videos with more than 10,000 frames.