Instream and outstream are terms from digital video advertising that describe where a video ad plays relative to content. Instream video plays inside a video player — before, during, or after video content (pre-roll, mid-roll, post-roll). Outstream video plays in non-video environments — in a news article, in a social feed, in a display banner slot. On CTV, nearly all inventory is instream, which is one of the reasons CTV delivers higher completion rates and better brand recall than most digital video formats.
Instream video on CTV
CTV instream video is what most people mean when they say "CTV advertising." The ad plays inside the streaming video player — the same environment the viewer chose to watch content in. Because the viewer is in a full-screen, lean-back video context with no competing visual elements, instream CTV delivers higher attention than any outstream digital environment.
Key characteristics of instream CTV: full-screen by default, non-skippable (typically), high completion rates (85–95% for non-skippable), sound-on by default, TV-screen viewing distance (2–3 metres rather than 30cm for mobile). These characteristics make instream CTV closer to broadcast TV in advertising impact than to digital display or even desktop video.
Outstream video on CTV: does it exist?
Outstream video in the traditional sense — a video ad playing in a non-video page environment — is rare on CTV because CTV content is primarily video. There is no CTV equivalent of an in-article video ad. However, there are CTV formats that share some outstream characteristics: home screen video ads that play on the TV launcher before any app is opened, banner ads with embedded video in platform UIs, and some interactive overlay formats that include video components.
These hybrid formats are sometimes called outstream CTV by DSPs that offer them, but the term is imprecise. On CTV, the meaningful distinction is not instream vs outstream but rather: does the ad play during content consumption (instream pre/mid/post-roll) or does it appear in a platform navigation environment (home screen, app shelf, content discovery). The latter group behaves more like display advertising than video advertising in terms of viewer intent and attention.
Why the distinction matters for India buyers
For India CTV planning, the practical implication is that nearly all video ad spend goes into instream environments on JioCinema, Hotstar, and YouTube. Non-instream video placements (home screen video, UI video ads) are available on Samsung Ads and some OEM platforms but are a small fraction of total CTV video inventory.
When a DSP or ad tech vendor uses the term "outstream CTV," verify what they mean. If they mean video in a non-content environment (home screen, app shelf), it is a display-adjacent placement with different attention and completion characteristics than standard instream pre-roll or mid-roll. Do not assume instream completion rate benchmarks apply to outstream CTV placements.
Completion rates: instream vs outstream CTV
Instream CTV non-skippable completion: 88–95%. Instream CTV skippable (TrueView): 40–60% post-skip-button. Home screen / UI video (outstream-adjacent CTV): 50–70% — lower because the viewer has not chosen to engage with content and may navigate away. The gap is meaningful for campaign planning: if a vendor quotes you CTV completion rates without specifying instream, confirm the placement type before committing budget.
India-specific note
India's major CTV platforms are primarily instream environments because they are video-first services. JioCinema is a streaming platform — every ad placement is inside or adjacent to video content. The OEM home screen inventory (Samsung, LG, Xiaomi) is where outstream-adjacent CTV exists in India, and it is sold primarily as display or branded UI rather than video. India CTV video planning can safely assume instream unless explicitly buying OEM home screen inventory.