Video advertising is not all the same. The same spot can hit hard or fizzle out almost unnoticed, depending on where it runs. The decisive difference carries two technical terms: in-stream and out-stream. They describe whether your ad appears in the middle of a video someone actually wants to watch, or whether it shows up somewhere between text and feed, where nobody was looking for a video in the first place.
This article explains both formats in plain language and shows why in-stream is the more effective path for most advertising goals.
What in-stream means
In-stream advertising runs inside a video the viewer has deliberately chosen. The spot appears before the content (pre-roll), in the middle of it (mid-roll) or after it (post-roll), much like the classic ad break on television. Anyone who wants to watch the film, the series or the match gets the advertising in the same player, often non-skippable and with sound.
That is exactly the point: the advertising is part of a viewing experience someone has already committed to. The attention is already there, it does not have to be won first. On Connected TV, meaning streaming on the television, in-stream is the standard format, full screen on the big screen.
What out-stream means
Out-stream advertising, often also called in-feed, runs outside a video player, usually embedded in text content: in an article, between paragraphs, on a news page, or in the social feed. A small video window starts as soon as someone scrolls past it, frequently automatically and usually muted. The name in-feed describes exactly this location: the advertising sits inside the feed or text flow, not inside a video.
The advantage of out-stream lies in reach: it opens up video advertising even where there is no video content at all, for example on text-heavy websites. The disadvantage stems from the same trait. The user was there for text, not for a video. The advertising interrupts instead of being part of the experience, and gets left behind quickly as the user keeps scrolling.
The direct comparison
| Criterion | In-stream | Out-stream (in-feed) |
|---|---|---|
| Where it runs | inside the video someone wants to watch | in text, while scrolling |
| Attention | already there | has to be earned |
| Sound | usually on | usually muted |
| Viewability | high, often full screen | fluctuating, only while scrolling past |
| Completion rate | high, often non-skippable | low, scrolled past quickly |
| Strength | attention and impact | additional reach |
Why in-stream delivers more impact
The difference is not a matter of taste, it shows up in the numbers. Because in-stream advertising runs inside a chosen video, it gets watched to completion far more often. On premium inventory, in-stream spots achieve completion rates above 90%. Your entire message gets through, including the brand and call to action at the end.
Then there is sound. In-stream normally plays with sound, because the viewer is already listening anyway. Out-stream formats are mostly muted, your music, your voiceover, your slogan go unheard. And viewability is different too: an in-stream spot fills the player, while an out-stream window only counts for as long as it happens to be on screen while scrolling past.
In short: in-stream buys attention, out-stream buys opportunity. For brand building, for messages that need to land, attention is the more valuable currency. How this media quality translates into numbers is shown in the article on the media quality of streaming advertising.
When out-stream still fits
Out-stream is not a bad format, it just serves a different purpose. Anyone who mainly wants to build broad, low-cost reach across many text environments, without needing to optimize every single contact for maximum impact, can use it as a sensible addition. As an extension of a campaign into environments without video content, out-stream has its place.
For the core of a campaign, where attention and full perception matter, there is hardly a way around in-stream.
In-stream on the big screen
In-stream works strongest where attention is highest: on television. Streaming advertising via Connected TV is in-stream in its best form, full screen, non-skippable, with sound, in the relaxed lean-back moment in front of the big screen. This is exactly the format you book through onescreen, combined with precise targeting and predictable reach.
Want to place your spot where it actually gets seen? Book a free demo, we will show you in 30 minutes what that looks like. Or get started directly in the Ad Manager.
FAQ
What is the difference between in-stream and out-stream? In-stream advertising runs inside a video the user has chosen, before, during or after the content. Out-stream advertising, also called in-feed, runs outside a video player, usually embedded in text content like articles or feeds, and often starts muted while scrolling.
Which format gets more attention? In-stream. Because the ad runs inside a deliberately chosen video, attention is already there. This shows up in higher completion rates, better viewability and sound that plays. Out-stream, by contrast, has to earn attention first.
Is out-stream worse than in-stream? Not worse, just different. Out-stream is strong when it comes to broad, low-cost reach across text environments. For maximum impact per contact, in-stream is superior.
What runs on Connected TV? On television, in-stream is the standard format: full screen, non-skippable, with sound. That makes streaming advertising on the big screen the most effective form of video advertising.
Do I need my own spot for in-stream? Yes, in-stream is a video format. If you do not have a spot, onescreen helps create one with the help of AI, faster and cheaper than classic production, based on existing materials.