Glossary

In-stream ads

What are in-stream ads

In-stream ads are short video advertisements that play within another video. They appear before the main video as pre roll, during the video as mid roll, or after the video as post roll. You will see them across platforms such as YouTube, Facebook, Instagram, OTT services, and connected TV. Because viewers are already focused on video, in-stream placements reach an attentive audience and can deliver strong completion and recall.


How in-stream ads work

When a viewer starts or resumes a video, the player requests an ad from the ad server or exchange. An instant auction selects the winning creative based on targeting, pricing, and brand safety rules. The ad plays inside the same player, then control returns to the content. Some formats allow skipping after a few seconds, others remain non skippable for a short window.


Types of in-stream ads

Linear formats

These replace the content for a brief moment, similar to a commercial break on television.

  • Pre roll plays before the content begins. Good for awareness and brand recall.
  • Mid roll appears during natural breaks. Completion rates are often highest here because viewers want to get back to the video.
  • Post roll runs after the content ends. Works well when the goal is to drive a next action such as a site visit or app open.

Non linear formats

These run on top of the content without fully interrupting it.

  • Overlay banner appears along the top or bottom edge during playback.
  • Overlay text offers short copy or prompts that complement the story.
  • Branded canvas unit briefly shrinks the video and frames it with brand visuals, similar to connected TV takeovers.

Companion units

Static or rich media placements that sit next to the player. They extend presence beyond the video and help reduce banner blindness. Companions often run alongside linear or non linear in-stream ads in a coordinated set.


In-stream vs out-stream

Both are video ads, but they behave differently.

  • Placement
  • In-stream lives inside a video player and runs before, during, or after content.
  • Out-stream plays in non video environments such as news feeds or within articles.
  • User experience
  • In-stream is more interruptive but benefits from a viewer already leaning into video.
  • Out-stream is easier to scroll past and can feel lighter.
  • Control
  • In-stream placement context follows the host video.
  • Out-stream gives advertisers more control over where the unit appears.

Choose in-stream for attention and completion. Choose out-stream for broad reach with flexible placement.


Benefits of in-stream ads

  • Viewer readiness People are already watching video with sound on, which boosts attention and message recall.
  • Reach across screens Works well on mobile, desktop, OTT, and connected TV with rich targeting by geography, interest, and behavior.
  • Flexible control You can select skippable or non skippable windows, cap frequency, and bid for completed views.
  • Measurable outcomes Track view through rate, completion rate, click through rate, brand lift, and conversions.

Challenges to plan for

  • Intrusion risk Interruptions can annoy viewers if the creative feels irrelevant or too long.
  • Player compatibility You need a standards compliant player and correct tags for smooth delivery.
  • Inventory limits Some environments restrict formats or length.
  • Higher media costs CPMs can exceed display and out-stream due to premium attention.
  • Context fit Poor alignment between ad tone and content can hurt performance.

Best practices

1. Win the first three seconds

Open with motion, a clear visual of the product, and a benefit the viewer cares about. Front load branding without sacrificing story.

2. Keep it viewer centric

Speak directly to the audience. Use you language and show how the product solves a real problem.

3. Design for sound on and sound off

Add captions, bold supers, and meaningful visuals. Music and VO should enhance rather than carry the message.

4. Use simple, specific calls to action

Guide the next step. Shop now, Install the app, Watch the demo. Reinforce the CTA on end cards and companion units.

5. Match length to goal

Six to ten seconds for quick recall. Fifteen to thirty seconds for consideration. Longer only when the story truly earns it.

6. Respect context and frequency

Avoid repetition fatigue. Exclude unsuitable categories and use brand safety tools.

7. Test and learn

A and B test hooks, offers, and formats. Optimize to completed views plus downstream actions, not views alone.


Core metrics


FAQs

Are in-stream ads always non skippable

No. Many placements allow skipping after a brief window. Non skippable options exist but should be used thoughtfully to avoid frustration.

Which performs best, pre roll, mid roll, or post roll

Mid roll often wins on completion. Pre roll is strong for awareness. Post roll can drive action since viewers have finished the content.

Do I need captions

Yes. Captions improve accessibility and performance for viewers who watch with sound off.

What length should I use

Create cutdowns. Six seconds for quick hits, fifteen seconds as a workhorse, and a thirty second version when the story needs space.

Can I run the same edit on mobile and TV

You can, but results improve when you tailor framing, text size, and pacing to each screen.


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