Definition:

In-stream video is an advertising format that plays before, during, or after video content that a user is watching. The ad is integrated into that viewing experience rather than appearing solely as an independent unit within a page or feed.

It is used on services such as YouTube and in other environments that distribute audiovisual content. Available placements, duration, and the option to skip the ad depend on the platform and advertising product purchased. Not every video ad on a social network is in-stream.

Google Ads offers skippable and non-skippable in-stream formats. Bumper ads also play alongside other videos, but have their own specifications. In-feed ads appear in discovery spaces, such as search results or recommendations, and should not be confused with an advertising interruption of the video being watched.

Types of in-stream video

One classification distinguishes when the ad appears in relation to the main content. It can occupy these three positions:

Pre-roll: plays before the video. It allows the message to be presented before the content starts, but does not guarantee attention or always constitute the most effective placement.
Mid-roll: appears during playback. It temporarily interrupts the content; availability and placement depend on the service’s rules and the video. Not all content supports these insertions.
Post-roll: plays after the video. It can present related information or a call to action, although its reach depends on the viewer continuing to watch.

Another classification concerns whether the ad can be skipped. With skippable in-stream ads in Google Ads, the user can skip after five seconds, not five minutes. Non-skippable ads do not offer that control during ad playback, but this does not ensure that the viewer pays attention or stays in front of the screen.

The maximum duration of non-skippable ads is not universally fifteen seconds. Google Ads supports durations of up to sixty seconds in certain subtypes; specific limits depend on the format and inventory. Bumper ads have a maximum duration of six seconds. The Google Ads video format comparison provides the conditions for each option.

Insertion timing, duration, and the option to skip are different characteristics. A short ad can be non-skippable, and the same format may appear before, during, or after content where the platform allows it.

How to create an in-stream video campaign

Setup depends on the advertising platform. In Google Ads, choosing a format also involves checking the campaign type, inventory, and available bidding strategies. Not all skippable ads are purchased in the same way.

It is useful to distinguish these two billing cases:

With CPV bidding: for skippable in-stream ads in Google Ads, a charge occurs when the user watches thirty seconds, the entire video if it is shorter, or makes a qualifying interaction, whichever happens first. Cost per view does not mean that every playback start generates the same charge.
With impression-based billing: CPM expresses the cost per thousand impressions, not per thousand completed plays. Non-skippable in-stream ads use target CPM; skippable ads may also use impression-based strategies or strategies designed to optimize conversions, depending on the campaign. Optimizing toward a CPA does not necessarily mean paying only when a conversion is recorded.

Cost and effectiveness cannot be inferred solely from whether the ad can be skipped. Audience, inventory, competition, message, and campaign objective also influence the results.

Organizing a campaign in Google Ads can be divided into these four stages:

Prepare the account and assets: have access to Google Ads and a video hosted on YouTube, public or unlisted, together with a landing page where appropriate. This hosting requirement belongs to Google Ads, not to every platform selling in-stream advertising.
Define the objective: specify whether the aim is reach, views, traffic, or conversions and how the outcome will be evaluated. This selection affects the available options.
Select a compatible campaign and format: choose a setup that supports the desired format, add the video, and prepare the text, links, and other required assets. The in-stream format does not itself correspond to a single campaign type.
Configure distribution and measurement: set budget, bidding, geographic locations, audiences, and inventory, review relevant exclusions, and check tracking before activating the campaign.

Subsequent review should distinguish impressions, qualifying views, completed plays, clicks, and conversions. These are different stages and measures; completing an ad does not by itself demonstrate a sale or an increase in awareness.

In-stream versus out-stream video

The main difference is the relationship with audiovisual content. In-stream is inserted into a video experience; out-stream can play in an independent advertising space, for example within an article or feed, without requiring editorial video before or after it.

Out-stream does not mean exclusively mobile or tablet. Devices, initial audio, and playback behavior depend on the format and provider. Many placements start without sound, but this is not a rule that by itself defines the entire category.

There is also no single purchasing method for all out-stream advertising. If a model based on viewable impressions is used, its criteria need to be checked. In standard video ad viewability measurement, an impression is considered viewable when at least 50% of the ad’s area remains on screen for two continuous seconds; this does not refer to 50% of the device’s screen.

Measured viewability does not demonstrate attention or equal a billable view under CPV. Separating these measures allows formats to be compared without assigning the same meaning to every playback counter.