Video annotation: what changes when the picture moves
· a.pannella87
Last updated: 27 October 2026 · OpenJob editorial team
Video annotation adds time to everything that makes image annotation careful. The three common tasks are tracking an object with the same ID across frames, marking when an action starts and stops, and describing scenes in writing. Projects define each rule precisely, often down to the exact frame that counts.
Key points
- Tracking: keep one ID per object, including through occlusion.
- Temporal segments follow the project’s exact start and end definition.
- Scene descriptions state only what is visible, never motives.
- Regular short breaks protect accuracy on long video tasks.
Everything that makes image annotation careful work also applies to video, plus one more dimension: time. Three tasks come up again and again.
Tracking
You follow an object across frames and keep the same ID on it. The difficult moments are occlusion (something passes in front) and re-entry (the object leaves the frame and comes back). Guides specify whether a returning object keeps its ID. Read that rule twice.
Temporal segments
Marking when an action starts and stops: a person picks up a cup, a car begins to turn. Start and end points are judgement calls, so projects define them precisely, for example “the first frame in which the hand touches the cup”. Matching that definition frame by frame is the job.
Describing scenes
Some video projects ask for written descriptions of what happens. Describe only what is visible. “A man walks quickly to the door” is fine; “a man hurries because he is late” is a guess.
Pace and fatigue
Video work is tiring on the eyes. Short breaks every hour help accuracy more than pushing through, and accuracy is what reviewers measure.
A note on recording projects
Some video listings ask you to record footage rather than label it, for example the 360° Video Recorder. These involve sharing recordings that may contain personal data; our listing pages flag this, and you should read the platform’s consent terms before applying.
Current annotation roles: Video Data Annotator, Video Data Annotation Specialist.
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Frequently asked questions
What is object tracking in video annotation?
Tracking means following an object across frames and keeping the same ID on it. The hard moments are occlusion, when something passes in front, and re-entry, when the object leaves the frame and returns. The guide says whether a returning object keeps its ID.
How should I describe a video scene?
Describe only what is visible: actions, objects, positions, order of events. Avoid guesses about intentions or feelings. A man walks quickly to the door is acceptable; a man hurries because he is late is an assumption the reviewer will mark as an error.
Are video recording jobs the same as video annotation?
No. Annotation means labelling footage someone else recorded. Recording projects ask you to film footage yourself, which may include your face, home or other people. Read the consent terms and the personal data rules before applying to a recording project.