The updated VAST specification with additions designed for CTV delivery: mezzanine file support for high-quality transcoding, server-side ad insertion compatibility, and a more robust error reporting structure. In practice, implementation across CTV publishers and players is inconsistent. Some are on 4.x. Some are still on 3.0. Creative and technical specs need to be confirmed per publisher, not assumed from the deal sheet.
Ad tech glossary
VAST 4.0+ for CTV
Technical definition
Advanced video ad serving template specifications designed specifically for connected TV environments, including support for mezzanine file quality and interactive elements.
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Related terms
- Audience Addressability
- AVOD (Advertising-Based Video On Demand)
- AVOD Stacking
- Co-Viewing Measurement
- Competitive Separation
- CTV (Connected TV)
- Deal Discovery
- Dynamic Ad Load
- Dynamic Pod Optimization
- FAST (Free Ad-Supported Television)
- Header Bidding for CTV
- Pod Length
Where this shows up
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CTV
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⏸️ Pause Ads
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CTV
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Get Better CTV Quality in 2025
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