VAST-4.1-mezzanine-recommended
<MediaFiles> has no <Mezzanine> — may be rejected in CTV/SSAI contexts
InfoCTVIAB VAST 4.1 §2.4.1VAST 4.1, 4.2, and 4.3
Many CTV ad servers and SSAI platforms require a `<Mezzanine>` element pointing to a high-quality source file for server-side transcoding. Without it, the ad may be rejected during trafficking.
How to fix
Add a <Mezzanine> element pointing to a high-quality source file (e.g. ProRes or high-bitrate H.264) so SSAI systems can transcode to the correct rendition.
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