Labelbox documentation

Video editor

The Labelbox Editor contains specialized features for labeling video data. Watch the video above to learn some tips and tricks for labeling videos in Labelbox.

Below are the annotation types you may include in your ontology when you are labeling video data. Classifications in the video editor can only be applied at the global level (nesting not yet supported).

Annotation type

Import format

Export format

Bounding box

-

See JSON

Point

-

See JSON

Radio classification (global only)

See JSON

See JSON

Checklist classification (global only)

See JSON

See JSON

How the video editor works
Video_editor_v2__1_.png

Editor component

Description

Tools menu

Contains the list of annotation classes (AKA ontology) for your project.

Annotations menu

Lists all of the annotations that have been created so far.

Progress bar

A visual indicator of the temporal progression of the frame sequence. You can hover over the progress bar to quickly preview any frame in the video.

Classification panel

Appears only for classification-type annotations (e.g., Radio). Here you can apply select answer(s) on a classification question and toggle the classification on/off.

Timeline

Displays a temporal visualization of all created annotations on the video clip. Indicates the frames on which the annotation was created. You can hover over the timeline to preview any frame in the video.

Keyframe

A keyframe is a frame in the sequence where an annotation starts, ends, or is modified in some way. A keyframe is indicated on an annotation track as a small circle. The frames between two keyframes are called interpolated (tweened) frames. This is because Labelbox uses interpolation to incrementally adjust the size and position of an annotation on frames in between keyframes. Note: interpolation is not applied to classifications.

When you are labeling videos in the Editor, you can customize the following for each annotation:

  • The selected frames to persist the annotation

  • The size of the annotation (only applies to bounding box)

  • The position of the annotation on the frames (does not apply to classifications)

By default, when you apply an annotation to a single frame, the annotation will persist until the last frame of the video.

bbox-single-frame.png

If you would rather limit an annotation to a set of frames, you must select the set of frames before applying an annotation to the frame selection.

bbox-frame-set.png

When you insert a new keyframe (i.e., change the position or size of an annotation) between two existing keyframes, Labelbox will re-interpolate the frames between the affected keyframes.

insert-bbox.png

When an object of interest exits the frame, then reappears 1 or more frames later, use the toggle icon to turn on/off the annotation. Toggle on/off annotations on multiple frames at a time is not supported. Note: Toggle on/off does not apply to classifications.

toggle-bbox.png