Learn how to add labels to video data
Feature | Import annotations | Export annotations |
---|---|---|
Bounding box | See payload | See payload |
Polyline | See payload | See payload |
Point | See payload | See payload |
Segmentation mask | See payload | See payload |
Radio classification | See payload | See payload |
Checklist classification | See payload | See payload |
Global free-form text classification | See payload | See payload |
Example annotations
T
) to adjust the length of the object instance.
F
to end the shape. By default, the shape will be created in the current frame and all frames following. You can use the annotation toggle (or the hotkey T
) to adjust the length of the object instance.
T
) to adjust the length of the object instance.
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 frame 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. |
Volume | Sometimes, to make a certain classification in a video, you need to be able to hear and see the content in the frame sequence. When a video has audio, your labeling team will be able to hear the audio during video playback (but not when hovering or stepping through with arrow keys). Labelers can adjust the volume level and click the volume button to mute/unmute audio playback. You can use the video editor to classify videos with both audio and visual content or audio content alone. To use the video editor to label audio only, please reach out to support for details. |
Shift
+ Space
to control the playback of the video. The left and right arrow keys can be used to move backward one frame and forward one frame, respectively.
Enter
.
Function | Hotkey | Description |
---|---|---|
Play/Pause | Shift + Space | Play or pause the video playback. |
Move backward one frame | Left | Move back one frame in the sequence. |
Move forward one frame | Right | Move forward one frame in the sequence. |
Add/remove a keyframe | K | Add/remove a keyframe for the selected annotation on the selected frame. |
Add/remove an object | T | Toggle the presence of an object on or off in the video timeline. |
Select multiple contiguous frames | Shift + Select | Select multiple, contiguous frames in the video. |
Select multiple discontiguous frames | Shift + Cmd + Select | Select multiple, discontiguous frames in the video. |
Advance to the previous keyframe | Opt + Left | Jump to the previous keyframe on an annotation instance track. |
Advance to the next keyframe | Opt + Right | Jump to the next keyframe on an annotation instance track. |
Undo | Cmd /Ctrl + Z | Undo an action. |
Redo | Cmd + Shift + Z (Mac) / Ctrl +Shift + Z (Windows) | Redo an action. |