01 / 04
Read beyond one keyword
Select a phrase to see the context that shapes the visual direction.
- Place
- Tiny apartment
- Time
- After midnight
- Story stage
- Early prototype
- Tone
- Constrained, reflective
- Avoid
- Polished startup office
AI B-roll Generator
Add B-roll that fits the story.
Let AI read the context, choose supporting footage, and place each cut where your narration needs it.
- Context-aware choices
- Editable clips and timing
- Your narration keeps playing
Talking-head source
Small apartment · after midnight
Physical constraint
One clear priority
I thought our first prototype needed a proper studio.
00:0000:0800:1600:24
A-roll
B-roll
What AI changed
One explanation became a visual story without losing the speaker.
- 3
- B-roll placements
- 1
- setting established
- 1
- constraint shown
- 3
- returns preserved
Context, choice, placement
The right clip depends on more than one word.
Captionate reads the full thought, compares possible footage, and turns the selected range into an editable timeline layer.
02 / 04
Choose with context
Related footage is not always the right footage. Compare the reason behind each choice.
Small apartment desk at night
Why it fits: Matches the place, time, and modest early-stage tone.
03 / 04
Place the cut, then return
Move through the edit. The picture changes while the original narration remains continuous.
B-roll · Apartment at night
Narration
A-roll
B-roll
04 / 04
Replace one choice without restarting
Ask for a different visual direction. The narration and surrounding edit stay in place.
Add B-roll where the setting or constraint would be clearer visually.
3 B-roll clips addedSetting · Constraint · Reflection
Use something less literal and more reflective for the overheating line.
Laptop under strain
09.3–13.5laptop-under-strain.mp4
Source to result
The narration stays. The visual layer changes with the story.
- 01Talking-head sourceOne continuous explanation
- 02Full-sentence contextPlace, time, action, and tone
- 03Supporting footageThree reasoned choices
- 04Editable B-roll cutReview every source and range
Editorial roles
Use B-roll to do a specific job.
Establish a place
Show the environment that makes the next line easier to understand.
Show the object in use
Prefer a meaningful action over a generic product close-up.
Explain without being literal
Match the emotional direction when an object would flatten the idea.
Return to the speaker
Keep the face for reactions, conclusions, and moments that need trust.
AI B-roll workflow
Automatically add B-roll to your video with context.
Find B-roll from the meaning of the full sentence
Captionate considers the words around a phrase, including setting, time, action, tone, and narrative purpose. A clip can be rejected even when it matches one keyword but contradicts the larger story.
Place supporting footage while the narration continues
B-roll changes the picture without interrupting the original speech. Each insert is aligned to a meaningful range, with deliberate returns to the speaker when a reaction or conclusion matters.
Use project media and connected visual sources
Start with footage already available to the project and review candidates from supported connected sources. The editor keeps the origin of each selected asset visible instead of flattening every source into one result.
Review and replace every AI-selected clip
Inspect the source, range, crop, and duration of each B-roll layer. Replace one choice directly or describe a new direction without rebuilding unrelated parts of the edit.
Add B-roll to talking-head videos, podcasts, and explainers
Use supporting footage in interviews, narration-led videos, tutorials, documentaries, product stories, and podcasts. The purpose of each insert can change while the selection process remains editable.
How it works
From an existing video to a reviewed B-roll edit.
Add your video
Start with the talking-head, podcast, interview, tutorial, or narration-led video you want to edit.
Identify moments that need visual support
Ask AI to find places where a setting, action, object, process, or emotional shift should be shown.
Review the footage and placement
Inspect why each clip was selected and where it enters and leaves the original timeline.
Replace individual choices
Choose another candidate or ask for a less literal, more specific, or differently paced visual direction.
Export the finished edit
Keep the original narration, confirm the visual cut, and render the completed video.
FAQ
AI B-roll generator questions.
What is an AI B-roll generator?
An AI B-roll generator analyzes a video's speech and context, identifies moments that benefit from supporting footage, and helps choose and place relevant clips in the edit.
Can AI automatically add B-roll to an existing video?
Yes. Captionate can identify suitable ranges in an existing video, choose supporting footage, and add it to the timeline while preserving the original narration.
How does Captionate decide which B-roll fits a line?
Captionate considers the full sentence and surrounding context, including place, time, action, tone, and the role that the visual should play in the story.
Does the original narration continue under B-roll?
Yes. B-roll replaces or supplements the picture while the original narration continues on its audio track.
Can I replace an AI-selected B-roll clip?
Yes. Each selected clip and its timing remain editable, so you can replace one choice or ask for a different visual direction without restarting the entire edit.
Can Captionate use footage already uploaded to my project?
Captionate can use project media as a source for supporting visuals when suitable footage is available. Available connected sources are shown in the editor.
What kinds of videos can use automatic B-roll?
B-roll can support talking-head videos, podcasts, interviews, explainers, tutorials, documentaries, and other narration-led edits.
Start with the story you already recorded
Add B-rollAdd the footage the narration needs.
Review each choice, refine the direction, and keep control of the finished edit.