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# VAST 4.0+ for CTV
- URL: https://www.adlingo.org/glossary/vast-4-0-for-ctv/
- Published: 2025-01-15T09:10:00.000Z
- Updated: 2025-01-15T09:10:00.000Z
- Description: Advanced video ad serving template specifications designed specifically for connected TV environments, including support for mezzanine file quality and interactive elements.
- Author: Travis Lusk
- Tags: CTV, #glossary, #Import 2026-10-27 17:05

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.