Video Labeling Editor

Overview of the Video Labeling Editor in Ango Hub

For a complete video tutorial on labeling videos on Hub, see the following:

Ango Hub provides a labeling editor with which video files can be annotated. The video editor will be opened when a user opens an asset with the following file extensions: .mp4, .mov, .webm, .ogg.

This article will exclusively go over Ango Hub’s video labeling interface. Features common to all labeling editors are instead explained here.

Overview of the Video Labeling Editor in Ango Hub

Playback Bar

When dragging with the slider, the frame selected will only be loaded when you release the left mouse button.

How to Annotate Videos

The following are the labeling tools supported on videos:

From the Tools panel on the left sidebar, select a supported labeling tool. Then, follow the instructions found on each tool's docs page, linked to above.

If no tools are present in the project, only answer the questions in the Classifications panel.

Labeling Properties Specific to Videos

Bounding Box Interpolation

Once you have created a bounding box, move forward some frames, then edit the label to its new position on the video. Ango Hub will automatically interpolate the position of the box in the frames where the label was not manually placed.

Interpolation is currently only available for the Bounding Box labeling tool.

Frame-Specific Classifications

When creating classifications such as radio, dropdown, and others, project managers may choose to make those classifications general (e.g., one response per video) or frame-specific (e.g. one response per frame.)

Here's an example on how to classify single frames using frame-specific classifications.

For this example, let's assume I have a video with 506 frames and a radio classification class with the answers "First", "Second", and "Third," and I wish to:

  • annotate frames 1 to 10 with "First"

  • frames 11 to 20 with "Second", and

  • frames 50 to 60 with "Third."

Here's how you would go about doing so:

  1. Navigate to frame 1 and click on First. This will enable the "First" answer for all following frames until we tell Hub otherwise.

  2. Navigate to frame 11 and click on Second. This will switch the annotation to Second.

  3. Navigate to frame 50 and click on Third.

Keyboard Shortcuts

A full list of keyboard shortcuts is available by clicking on the Keyboard button on the right side of the top bar:

Further reading

pageAudio Labeling EditorpageLabeling Editor Interface

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