Video Annotation Platform

Video Annotation Platform Built for Speed and Scale

Curate and annotate complex video data 15x faster for production AI projects.

Video annotation features

Everything You Need for Complex Video Annotation

Auto-track multiple objects, label frame by frame, manage temporal properties, and review long videos without losing context.

Auto-Track All selecting a van and cyclist together inside one group box, with the group clicked at its center and tracked across three frames
01 · Automation

Full Auto-Tracking

Select one or many objects, then track bidirectionally, forward, or backward from a trusted frame. Review propagated tracks and correct only the keyframes that need attention.

Bidirectional trackingForward trackingBackward tracking
A tennis serve shown as a smooth sequence of five synchronized frames and an audio waveform
02 · Playback

Smooth video playback while you annotate

Play, pause, scrub, and step through video while the canvas, overlays, object tracks, and timeline remain synchronized.

Three consecutive cyclist video frames aligned to an exact keyframe timeline
03 · Precision

Frame-accurate video labeling

Move one frame at a time, jump to an exact frame, zoom the timeline up to 10×, and place keyframes precisely.

Vehicle and Road ontology hierarchy cards with selected attributes and callouts for class attributes, relations, and temporal segmentation
04 · Structure

Nested ontologies and dynamic properties

Define nested classes and frame-aware properties for objects and scenes, then review each temporal value range on the timeline.

Four video moments connected to object tracks, states, keyframes, and a shared playhead
05 · Context

Complete video annotation timelines

Review object tracks, keyframes, classifications, dynamic properties, and item-level states together without losing context.

A long highway video filmstrip with a magnified three-frame selection and precise overview timeline
Example sequence10 h 35 min
06 · Scale

Large video annotation at exact-frame precision

Navigate a 10 h 35 min sequence with overview navigation, timeline zoom, stable playback, and exact frame access.

Long-form navigationExact frame access

Why AI Teams Choose Unitlab for Video Annotation

Annotate complex video datasets faster with AI-assisted automation, scalable workflows, and lower operational costs.

15X
Faster Video Annotation
90%
Automated Video Annotation
10X
Lower Annotation Costs
Supported video annotation types

All video annotation types in one platform.

Create bounding boxes, segmentation masks, polygons, skeletons, polylines, keypoints, and 3D cuboids across video frames.

01
Objects and tracks

Bounding box

Track rectangular regions across frames with interpolation or Auto-Tracking.

02
Pixel-level masks

Segmentation

Capture pixel-accurate object masks as appearance and motion change.

03
Precise boundaries

Polygon

Outline irregular shapes precisely across keyframes and temporal sequences.

04
Pose structures

Skeleton

Model pose and articulated movement with connected keypoints.

05
Paths and edges

Line / polyline

Trace lanes, paths, edges, and contours through changing scenes.

06
Landmark precision

Point / keypoint

Mark exact landmarks and follow them through motion.

07
Oriented volume

Cuboid / 3D box

Represent oriented objects with depth-aware 3D boxes in video.

08
Video-level context

Item Properties

Label properties that describe the complete video, including environment, source, quality, and scene-level attributes.

09
Object connections

Relations

Connect objects and events to capture interactions, ownership, direction, and other contextual relationships.

Video dataset curation & annotation workflows

Curate video data and automate annotation workflows.

Search, version, and inspect video datasets, connect AI models, and move annotations through review and approval.

Dataset version control in Unitlab AI
Version

Dataset Versions

Create and manage dataset versions as video data evolves. Track changes, assign work, and keep every version auditable and production-ready.

Semantic search across datasets in Unitlab AI
Discover

Semantic Search

Explore large video datasets through semantic understanding instead of manual filters. Find relevant clips and frames across diverse conditions.

Dataset embedding visualization in Unitlab AI
Inspect

Embedding View

Visualize dataset structure, identify outliers and labeling issues, and improve video-data quality before training.

Integrated Unitlab workflow connecting models, annotation, review, and quality assurance
Orchestrate

Integrated Workflows

Build workflows that connect models, annotation, review, and quality assurance in one continuous loop. Reduce handoffs and keep datasets moving from labeling to approval.

Bring your own AI model into the Unitlab annotation workflow
Integrate

Bring Your Model

Connect your own AI models for pre-labeling and model-assisted annotation. Improve accuracy and iterate faster on real-world video datasets.

Questions, answered

Video Annotation Platform FAQs

Answers about video annotation types, automatic object tracking, long and multi-camera videos, temporal ontologies, quality workflows, custom models, and dataset operations in Unitlab.

Talk with the Unitlab team
What video annotation types does Unitlab support?+

Unitlab supports bounding boxes, segmentation masks and brushes, polygons, skeletons, lines and polylines, points and keypoints, cuboids and 3D boxes, relations, class properties, and item properties. Teams define the required labels and rules in a reusable ontology for consistent video training data.

Video annotation documentation
How does automatic object tracking work in Unitlab?+

Select one or multiple annotated objects, then run bidirectional, forward, or backward Auto-Tracking. Unitlab creates editable tracks and keyframes across the chosen range, while deterministic interpolation supports controlled motion between human-verified frames.

Auto-Tracking documentation
Can Unitlab annotate long videos and multi-camera footage?+

Yes. Unitlab combines smooth playback, frame stepping, zoomable timelines, and frame-accurate controls for long-form video annotation. Related camera feeds can also be grouped into a synchronized multiview workspace so annotators preserve context across perspectives.

Multi-camera video documentation
How do ontologies and dynamic properties work in video annotation?+

Nested ontologies define objects, classifications, properties, events, and relations. Dynamic class properties capture changing object states, while dynamic item properties capture scene-level conditions as reviewable temporal ranges and keyframes on the video timeline.

Properties and relations documentation
How does Unitlab manage video annotation quality and review?+

Configurable workflows route video tasks through annotation, review, rework, and approval. Instructions, assignments, comments, issues, annotation history, dataset versions, and releases keep quality decisions traceable for individual experts and enterprise teams.

Annotation and review documentation
Can teams use their own AI models for video pre-labeling?

Yes. Unitlab can bring custom models into the annotation workflow to generate pre-labels and predictions. Annotators review and correct model output instead of starting from zero, while human approval remains part of the governed quality process.

Model integration documentation
Can Unitlab curate, annotate, and version video datasets in one platform?

Yes. Teams can curate video data with metadata filters, semantic search, embeddings, similarity, and outlier discovery, then annotate selected samples, review results, and publish controlled dataset versions for reproducible AI development.

Dataset management documentation
VIDEO ANNOTATION PLATFORM

Build Production-Ready Video Datasets with Unitlab

Annotate, track, review, and manage complex video data in one AI-assisted workspace. Move faster from raw footage to production-ready datasets with automated tracking and built-in quality control.