What is Dynamic Ad Insertion?

Updated September 2026 · Reviewed by the Flicknexs platform team

Quick answer

Dynamic Ad Insertion (DAI) replaces placeholder ad spots in a video stream with actual ads at playback time. The server swaps the ad source based on viewer data, such as location or demographics, without re-encoding the main video content.

Key takeaways

  • DAI allows one video file to serve different ads to different viewers.
  • It requires precise SCTE-35 markers in the source video to trigger swaps.
  • Operators can update ad campaigns instantly without re-uploading video files.
  • Accurate cue points are critical to prevent buffering or skipped ads.

How Dynamic Ad Insertion works

The process starts with a video file containing empty ad slots, often marked with SCTE-35 signals. When a viewer requests the stream, the ad decision server (ADS) checks the viewer's profile and the current ad campaign rules. The server selects the appropriate ad creative and instructs the video server to splice that creative into the stream at the designated cue point.

This happens in real time. The viewer's player receives a continuous stream where the ad appears as part of the main content. The main video file remains unchanged on the server. This method separates content storage from ad delivery. It allows you to manage thousands of ad variations from a single video asset.

  • Ingest: Upload video with ad markers.
  • Decision: Server selects ad based on viewer data.
  • Splice: Server merges ad and video into one stream.
  • Playback: Viewer sees the final, combined stream.

Why Dynamic Ad Insertion matters for a streaming business

Static ads require re-encoding and re-uploading video files every time you change a campaign. This is slow and expensive. DAI lets you swap ads instantly. You can change a sponsor, update a local ad for a specific region, or test different creative lengths without touching the video file. This speed supports agile marketing strategies and local ad sales.

For operators, DAI improves monetization flexibility. You can sell targeted ads to brands that want to reach specific demographics or geographic areas. The ability to serve personalized ads increases the value of your ad inventory. It also simplifies content management. You maintain one master file per title, reducing storage complexity and upload time. This efficiency is key when managing large libraries or live events with frequent ad rotations.

Common mistakes with Dynamic Ad Insertion

  • Missing or misplaced SCTE-35 markers: If the cue points are not in the right place, ads may play over dialogue or fail to appear at all.
  • Ignoring ad length mismatches: If the ad creative is longer than the placeholder slot, the stream may buffer or skip content.
  • Poor fallback handling: If the ad server is slow or down, the player should default to the main video. Without a fallback, viewers may see a black screen.
  • Neglecting analytics: You must track which ads served to which viewers to prove value to advertisers and optimize campaigns.

How Flicknexs handles Dynamic Ad Insertion

Flicknexs supports SSAI (Server-Side Ad Insertion), which is the technical mechanism behind DAI. You can schedule ads within your 24x7 cloud playout channels and VOD content. The platform processes SCTE-35 markers to trigger ad swaps. You manage campaigns, target audiences, and track performance through the self-serve advertiser portal. This setup lets you run local and global ad strategies from a single dashboard. See the Launch a FAST channel page for details on setting up ad-supported linear streams.

Launch a FAST channel →

Done reading about Dynamic Ad Insertion?

Flicknexs ships it as part of a white-label streaming platform: web, mobile and TV apps, billing, ads, DRM and playout, on your own domain.

Launch a FAST channelStart Your OTT Free

Dynamic Ad Insertion FAQ

SSAI is the technical method of inserting ads on the server side. DAI is the business concept of changing ads dynamically based on viewer data. SSAI is how you achieve DAI. They are often used interchangeably in industry discussions.
No. You upload the video once with ad markers. The server handles the ad insertion during playback. You can change ads without touching the video file. This saves time and storage space compared to static ad methods.
Yes. DAI works well with live streaming. You can insert ads into live events as they happen. The server splices ads into the live feed based on real-time viewer data. This is common in sports and news channels.
A well-configured system has a fallback mechanism. If the ad server takes too long to respond, the player serves the main video without the ad. This prevents buffering or playback errors for the viewer. It ensures a smooth experience even if ad delivery has issues.
DAI allows you to define skip rules within the ad slot configuration. If a viewer skips before the required watch time, the system logs the event and moves to the next ad or content. This behavior is controlled by your ad server settings, not the video player itself, giving you full control over monetization retention.
Yes, DAI works well for short-form content when ad slots are brief. It enables precise timing without cutting the video file. For very short clips, pre-roll or mid-roll insertion is common. The key is balancing ad length with content duration to maintain viewer engagement and prevent drop-off during the ads.

Standards and references

Further reading

Dynamic Ad Insertion (DAI): How It Works for Streaming