Should You Use AI Video or Stock Footage for B-Roll?

Where stock footage remains the lower-risk option

Stock footage works well when a campaign needs familiar, credible scenes: a person applying moisturizer in a bright bathroom, a close-up of water droplets, or a calm morning routine. Libraries offer predictable quality, clear licensing terms, and footage that an editor can place on a timeline immediately.

For performance teams producing frequent ads, that reliability matters. Stock is especially useful for foundational shots where the product, setting, and action are broadly recognizable. It also gives reviewers fewer surprises around anatomy, brand accuracy, or visual continuity.

Use licensed footage when the scene already exists in the market and speed matters more than novelty. A polished clip of someone opening a skincare jar may do its job perfectly. Generating that same generic moment adds review time without creating much additional campaign value.

The B-roll AI can make campaign-specific

AI video becomes valuable when the creative concept is highly specific to the campaign and too narrow for a stock search. It can produce visual metaphors, unusual product-world scenes, and variations tailored to a hook, audience, or offer.

Consider a skincare brand promoting overnight hydration. The team needs ten B-roll concepts for one message: skin that feels replenished by morning. Stock libraries may offer sleeping faces, water, and beauty shots. Generated video can explore a dewy pillowcase at dawn, a translucent moisture veil settling over skin, moonlight reflecting through a glass of water, or a close-up product scene with a soft nighttime color palette.

These clips give each ad a more native feel because the visual can match the copy precisely. A “wake up hydrated” hook can receive its own treatment, while a “barrier support through the night” hook can use a different visual direction.

Protoface gives teams a hosted way to test those custom B-roll ideas with video models. Developers can build generation into an ad tool or creative workflow and pay per generated second, while Studio supports faster experiments for ads, UGC, and product clips.

Compare licensing, iteration, and review effort

The useful comparison goes beyond the source-file cost. Stock footage has a known license and a fast edit path. Generated footage creates room for creative iteration, though each usable clip needs prompt development, generation time, and visual review.

Review generated B-roll against a short checklist:

• Does the clip support the claim without implying an unsupported result?

• Do hands, faces, packaging, text, and product details hold up frame by frame?

• Does the lighting match the rest of the edit?

• Can the team reuse the concept across formats and campaign variations?

Generation pays off when one approved concept can produce several distinct assets. A marketer may create horizontal, vertical, close-up, and abstract versions of the same hydration idea, then test each against different opening lines. Stock is more efficient when a single conventional shot fills a gap.

Build review into the workflow from the start. Save prompts, note successful settings, and keep approved generations in a shared library. This turns experimentation into a repeatable production process instead of a folder full of almost-right clips.

Use both sources in the same edit

The strongest ads often combine licensed footage with generated B-roll. Stock can establish a real-world routine and provide dependable human moments. Generated clips can carry the visual hook, transition between scenes, or make an abstract product benefit easier to understand.

For the overnight hydration campaign, open with a licensed shot of someone completing an evening skincare routine. Cut to a generated macro visual that expresses moisture settling in overnight. Return to a clean product shot and a straightforward benefit statement. The result feels grounded while giving the campaign a distinctive visual memory.

Start with one narrow use case: create three generated alternatives for the first two seconds of an existing ad. Measure thumb-stop rate, hold rate, and conversion performance against the stock-led version. Keep the winning structure, then expand into new concepts.

Generated B-roll earns its place when it makes a campaign idea more specific, faster to test, and harder for competitors to imitate. Stock footage remains a dependable production tool. Together, they give a lean creative team both speed and range.