Back to Error DirectoryW3C EPUBCheck Standard
OPF-036Critical Ingestion Error

Video type "resource" might not be supported by reading systems

Video type "resource" might not be supported by reading systems

Automated 1-Click Fix Ready

Fix all OPF-036 errors in your EPUB automatically

PreFlight checks for OPF-036 issues in memory and provides 1-click remediation during client-side packaging.

Scan & Fix Now

What This Error Means in Plain English

EPUBCheck detected Video type "resource" might not be supported by reading systems. Digital reading systems and bookstores require standard conformance to ensure compatibility across all reading apps.

Why Retailers & EAA Regulations Block This File

Automated book distributors (Apple Books, Amazon KDP, Kobo, and IngramSpark) run strict EPUBCheck validation on ingest and reject non-compliant files.

Technical Specification: W3C EPUBCheck rule OPF-036: Video type "resource" might not be supported by reading systems

Manual Fix Instructions (for Sigil / Calibre)

  1. Locate the file and line flagged under rule OPF-036 in your EPUB editor (Sigil or Calibre).
  2. Apply the required syntax correction matching the OPF-036 specification.
  3. Re-pack and validate with PreFlight EPUB to confirm zero residual errors.