VAST Error 411: Mezzanine provided but non-compliant
A mezzanine file was included but doesn't meet the required spec — wrong resolution, codec, bitrate, or container for the platform's ingest rules.
The counterpart to 406: the <Mezzanine> element exists, the file downloads, but the platform's ingest validation rejects it — too compressed, wrong codec, interlaced, wrong frame rate, or below minimum resolution.
Each SSAI platform publishes its own mezzanine spec; a master that passes one platform can fail another's stricter rules.
Why error 411 happens
Streaming rendition passed off as a mezzanine
A 5 Mbps delivery encode declared as the master. Ingest validation detects the compression level and rejects it.
Spec mismatch with the platform
Wrong frame rate, interlaced source, or resolution below the platform's minimum for the placement.
How to fix VAST error 411
- 1
Read the platform's mezzanine spec and probe the file
Compare the file's actual codec, bitrate, resolution, and scan type against the published ingest requirements.
- 2
Export a true master from the edit
Generate the mezzanine from the original project (ProRes or equivalent), not by upscaling a delivery encode.
Seeing error 411 on a live tag?
Paste the tag URL or XML — the validator resolves the full wrapper chain, validates the schema, downloads every media file, and shows exactly which stage fails.
Validate your VAST tagVAST error 411 — frequently asked questions
How is 411 different from 406?+
406 means no mezzanine was provided at all; 411 means one was provided but failed the platform's quality/spec validation.