What is a pre-roll ad?

The terms come from where the ad sits

Roll refers to the stream of content, and the prefix says where the ad is inserted: before it, in the middle, or after it. The three terms apply wherever video is sold with ads around it, from YouTube to connected TV apps and publisher sites. Behind the scenes, many of these placements use the IAB's Video Ad Serving Template, known as VAST, a standard that tells a video player which ad to fetch and where to place it, so the same ad file can be served as a pre-roll on one site and a mid-roll on another. The creative problem changes with the slot even when the file does not.

How skipping and billing work

On YouTube, a skippable in-stream ad can play before, during or after a video, and Google's help page says the viewer can skip it after five seconds. Advertisers using cost per view bidding pay when someone watches thirty seconds, or the whole ad if it is shorter, or interacts with it. That rule shapes the creative. An ad that lands its brand and offer in the first five seconds gets value from people who skip without being charged for them, while a slow build spends most of its budget on viewers who never saw the point. Non skippable formats are bought on impressions instead.

When each position makes sense

Pre-roll is the default for reach, because every play can carry one, and it suits clear offers, launches and retargeting. Mid-roll suits longer content with a loyal audience, such as tutorials, podcasts and long explainers, and it works best when the break falls at a natural pause; YouTube's guidance notes that ad slots at a pause in audio or a visual transition tend to keep viewers. Post-roll is the cheapest attention and suits follow ups, next episode prompts, or a reminder to people who have already shown interest. A campaign that uses more than one position usually needs a separate cut for each.

Writing for the first five seconds

Treat the first five seconds as the whole ad and the rest as a bonus. Show the brand and name the viewer's problem or the offer immediately, in words on screen as well as spoken. Avoid slow logo animations, long establishing shots and questions that only pay off at the end. Give the viewer a reason to stay past the skip button, such as a specific number or a visible demonstration that starts in the opening frame. Then close with one action and repeat the brand. A fifteen second ad written this way often outperforms a thirty second one with the same budget.

Common mistakes

Running a television spot unchanged as a pre-roll is the most common error, because broadcast ads are built to reveal the brand at the end and skippable viewers are gone by then. Another is using the same creative in all three positions. A post-roll that opens with a hard hook feels odd to someone who has just finished a video, and a mid-roll that restarts the story from zero wastes an engaged viewer. A third mistake is measuring pre-roll on click through alone; view through results and brand search lift are often where its value shows.

Where it shows up in the product

The video generator does not buy, place or schedule ads, and nothing in it sets an ad to pre, mid or post position; that is chosen in the ad platform. What it produces is the MP4. For in-stream placements that usually means the landscape 1920 by 1080 format, and the long length setting targets about thirty seconds across six to twelve scenes. Promotional scenes run 2.5 to 4 seconds, so the brand and offer can sit in the first two scenes, before a skip button appears. The SaaS feature launch example names the release in its first scene and the problem in its second, which is the order a skippable slot rewards.

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