Video is the largest and fastest-growing programmatic format, now accounting for over half of digital ad spend globally. The channel spans an enormous range — from six-second bumpers to 60-second CTV pre-roll, from full-episode player ads to autoplay-muted feed video — and each format needs a different creative approach, measurement framework and buying strategy. This guide is the working model we use to plan, buy and measure video advertising across 100+ markets.
1. What video advertising covers today
Programmatic video covers four distinct environments: in-stream (pre-roll, mid-roll and post-roll played inside a video player), out-stream (video that plays inside article content, often on mute), CTV/OTT (video served inside connected-TV apps and streaming services), and short-form social video (TikTok, Reels, Shorts — sold through their own platforms).
Only the first three are meaningfully "programmatic" through open DSPs. Short-form social remains largely walled-garden and requires platform-native buying. The buying rules, creative specs and measurement approaches differ enough between environments that treating "video" as one channel loses money.
The strategic role of video is upper-funnel awareness and consideration. Direct-response video works but only with careful frequency management, sharp targeting and creative built for the specific format — not a repurposed TV spot.
- Four video environments — treat each separately.
- In-stream, out-stream and CTV are the programmatic-first formats.
- Repurposed TV spots consistently underperform format-native creative.
2. VAST, VPAID and the video ad tech stack
The Video Ad Serving Template (VAST) is the IAB standard that lets any video player call any video ad server. VAST 4.2 is current — it separates the media file from the ad metadata, supports server-side ad insertion (SSAI) and defines the events (impression, quartile, click, complete) that get tracked.
VPAID (Video Player-Ad Interface Definition) added interactivity to VAST, but is deprecated because it enabled fraud and killed viewability. Most premium supply (and all CTV) has moved away from VPAID; use OMID (Open Measurement Interface Definition) for interactivity and verification instead.
Server-side ad insertion (SSAI) stitches the ad into the video stream on the server, making it indistinguishable from content — critical for CTV where client-side JavaScript doesn't run and ad blockers are common.
3. Format specs: bumper, pre-roll, mid-roll, CTV
Six-second bumpers (unskippable, forced) drive frequency and unaided recall at low CPM. Perfect for reminders after a longer video flight. Delivered on YouTube and premium OLV inventory.
15- and 30-second pre-roll are the workhorse — the standard TV-spot lengths translate directly. Skippable variants (5s skip) trade completion rate for goodwill and are the default on YouTube and most premium OLV.
CTV runs 15s, 30s and increasingly 60s pods. Unlike open-web pre-roll, CTV cannot be skipped and is served at full-screen with sound — giving completion rates of 95%+ and viewability of 98%+. Non-skippable + high-attention = TV-like impact at digital price.
Out-stream video (autoplay muted in article content) has viewability challenges but delivers massive reach at 3–5× lower CPM than in-stream. Design the first 3 seconds to work sound-off or the format fails.
- Non-skippable ≠ better performance — skippable ads that hold attention deliver higher recall.
- CTV completion rates of 95%+ set a different measurement expectation than open-web video.
- Out-stream is a distinct format; TV creative repurposed for out-stream almost always underperforms.
4. CTV and OTT: the biggest growth story
Connected TV (CTV) is any TV screen connected to the internet: smart TVs, streaming sticks, game consoles, set-top boxes running streaming apps. OTT is the content delivered over the top of traditional cable/satellite. Ad-supported OTT (Hulu, Peacock, Netflix Basic, Prime Video ads, Tubi, Pluto) is where the ad money is going.
CTV buying happens through DSPs but the supply is more concentrated than open-web display. The top 10 CTV publishers (Netflix, YouTube, Hulu, Peacock, Prime Video, Roku, Tubi, Samsung TV+, Pluto, Vizio) account for the vast majority of impressions in most markets.
CTV is not addressable at the individual level (privacy-safe household targeting is standard). It is measured on households and mobile-device co-viewing panels, not cookies. Expect to pay $30–$60 CPMs and see very high viewability and completion, but limited direct-response signal.
5. Video creative: the rules that decide skip vs stay
Brand visible in the first 3 seconds. Skippable video ads see 60–80% skip at second 5; you have 4 seconds to justify the next 26. Front-loaded storytelling beats slow builds every time.
Sound-off first. 70%+ of out-stream and mobile in-stream plays start muted. Design the first 3 seconds to make sense with no audio, subtitle any voiceover, and hold the brand mark for at least 2 seconds at the end.
One story, one message. A 15-second video ad has time for one product benefit and one call to action. Cramming three products into 15 seconds is the single most common failure mode.
Cut for the format. A 30-second TV spot re-cut to 15 seconds by a media agency almost always underperforms creative shot for 15 seconds. Brief the agency for the format, not the medium.
6. Measurement: completion, attention and brand lift
Standard delivery metrics: impressions, viewable impressions (2 seconds of 50% pixels for MRC video), Video Completion Rate (VCR), Cost Per Completed View (CPCV). CPCV normalises across skippable and non-skippable inventory.
Attention measurement (Amplified Intelligence, Lumen, TVision) is becoming the gold standard for video. It measures active seconds of attention per impression, not just play events — and correlates far better with brand lift and sales.
Brand lift studies (via Kantar, Nielsen or platform-native tools like YouTube BrandLift and TVision) measure aided/unaided recall, brand favourability and purchase intent against a control group. For any campaign above $250k, brand lift should be table stakes.
- CPCV normalises skippable vs non-skippable pricing.
- Attention-per-impression predicts outcomes better than viewability.
- Above $250k budget, always ship a brand-lift study.
7. Buying video: DSPs, PMPs and platform-native
For open-web in-stream and out-stream, buy through a DSP (DV360, The Trade Desk, Xandr, Amazon). For CTV, add CTV-specialist DSPs (Vibe, Tatari, MNTN) alongside — they have deeper inventory access on the biggest CTV publishers.
For YouTube specifically, Google Ads or DV360 are your only options (Google owns the inventory). For TikTok, Meta Reels, LinkedIn Video, Snap and Pinterest, use platform-native buying — the walled gardens do not open up.
PMPs are the default in CTV — most premium inventory is not on open exchange. Set up direct-negotiated PMPs with the top 5 CTV publishers in each market before you go live.
8. Launching your first video campaign
Pick a single objective. Awareness → CTV or premium in-stream with brand-lift study. Consideration → skippable pre-roll with sequential messaging. DR → capped short-form + retargeting layer with view-through attribution.
Frequency-cap deliberately. 3–5 views per user per week is the awareness sweet spot; more than 8 kills brand favourability faster than it builds recall.
Budget 20–30% of production spend on making the ad work for the format, not repurposing an existing asset. Sound-off variants, cutdowns for 6s bumpers, portrait cuts for mobile — these are line items, not afterthoughts.
See Video CPM benchmarks in your market
The Global CPM Index shows 2026 average Video CPMs for every market Adyllic activates in — filtered and ready to compare.
Open Global CPM IndexFrequently asked questions
What is the difference between in-stream and out-stream video?+
In-stream video plays inside a video player (before, during or after actual video content) — pre-roll, mid-roll, post-roll. Out-stream video plays inside non-video content, typically autoplay-muted in an article. In-stream commands 3–5× higher CPMs but delivers higher completion rates and sound-on views; out-stream scales cheaply but requires creative built for sound-off, first-3-seconds attention.
What CPMs should I expect on CTV in 2026?+
CTV CPMs in the US and UK sit around $30–$60 for premium inventory (Hulu, Peacock, Netflix Basic, YouTube CTV), $15–$30 for tier-two AVOD (Tubi, Pluto). Non-US markets typically run 30–50% lower. Bumpers and non-skippable pre-roll price higher than mid-roll pods.
How is CTV different from linear TV advertising?+
CTV is addressable at the household level, bought programmatically through DSPs, measured on impressions and completion, and typically non-skippable at full-screen with sound. Linear TV is bought on demographics, sold by daypart and network, and measured on GRPs. CTV replaces the lost audience of linear (cord-cutters, younger viewers) but doesn't match linear's mass simultaneity for tent-pole moments.
Should I use skippable or non-skippable video ads?+
Both. Non-skippable 6s bumpers drive frequency and unaided recall at low cost. 15–30s skippable pre-roll gives you space to tell a story to the audience willing to stay — and skips act as a soft targeting signal for future rounds. Ship both; don't choose one.
How do I measure video ad effectiveness beyond completion rates?+
Layer three measurement types: attention (Adelaide, Lumen, TVision) for per-impression quality, brand lift (Kantar, Nielsen, YouTube BrandLift) for perception change, and incrementality tests (matched-market or ghost bidding) for sales impact. Completion alone tells you the ad played — not whether it worked.
What is the minimum viable video ad budget?+
For a meaningful open-web in-stream campaign, $10k+ across two weeks. For CTV, $25k+ to get access to premium PMPs. Below those thresholds, direct platform buying (YouTube, Meta, TikTok) is usually more efficient than programmatic.
Plan your next video campaign with Adyllic
Curated in-stream, out-stream and CTV supply across premium publishers, full-service creative adaptation, and brand-lift + attention measurement — in 100+ markets. Talk to a strategist to scope your plan.