How to use a clip from your own social post as b-roll
Give Vizard Agent the link to the post and say which part of the main video it should cover. Published clips arrive with their own captions burnt in and in a shape that rarely matches your edit, so the useful part of the job is finding a crop window that carries the picture without the text.
What do you type into Vizard Agent?
Say what the clip is for, not just where it came from. "Use this as b-roll for this video" tells Vizard Agent the clip is illustration rather than content, which is what licenses it to crop into the picture and drop the clip's own audio. Send the main video too, so its captions can be measured.
Prompt
What does Vizard Agent actually do?
Almost all of the work is geometry: what each clip has burnt into it, and where it can safely be cropped. The space a reused clip can fill is defined by where your own captions sit, which is a measurement rather than an impression, and captions that grow as words appear need a mask that follows them. In the session behind this article it:
- Downloaded two already-published reels to use as b-roll in an interview, read the transcript and sampled frames from all three videos.
- Checked caption placement and found the shot changes inside the reels.
- Inspected the main video's caption band across time and measured the exact caption box and the panel split positions.
- Previewed each reel cropped to the top panel, then tested a lower crop window on the planting shots to keep the hands and plants and lose the text.
- Checked whether the captions animate and generated a caption mask track from the main video.
- Test-rendered the first twenty seconds to check the timing and the composite.
When does this not work well?
Some posts can't be reused at all. A clip with a platform watermark burnt into it, one carrying music you don't have the rights to, or one whose captions cover the subject leaves Vizard Agent with nothing usable once the cropping is done. Very low resolution gets worse when cropped in, and somebody else's post needs their permission.
Common questions
Can it fetch any post? Public ones, and Vizard Agent will say when a link cannot be reached.
Will the b-roll keep its sound? Not usually. Vizard Agent keeps your main audio and drops theirs.
Can it use several posts? Yes. Vizard Agent treats each one as its own source and crops it accordingly.