CueNorm Public Validator

Apple

Apple iTunes Subtitles (iTT)

Apple iTunes / Apple TV subtitle delivery profile, iTunes Timed Text

Validate a file with this profile apple-itunes-subtitle-itt@2026.1

Format: itt
Destination: Apple itunes
Language: any
Specification: reviewed
Interoperability: unverified
Last checked: 2026-09-23

Validation rules

Rule	Severity	Parameters	Applies when
MAX_LINES	error	max=2	always

Always checked

Whatever the profile's rules: how the file is read (file reading, FILE_FORMAT_MISMATCH, NO_SUBTITLES_READ), the timing of a delivery (NON_POSITIVE_DURATION, SUBTITLES_OUT_OF_ORDER, SUBTITLE_OVERLAP) and the language of the subtitles (SOURCE_LANGUAGE_MISMATCH).

Sources

Apple

official

Apple Video and Audio Asset Guide, 5.3.19 (2026-09-08)

Retrieved 2026-09-23 Open source document
Apple

official

iTunes Package Film Specification — iTunes Timed Text Profile, 5.0 (2012-05-22)

Retrieved 2026-09-23 Open source document

This is a CueNorm profile based on published specifications. It is not endorsed by Apple.

Resolved profile hash, recorded in every report and deliverable:

2936eef891ab2013b26558204f5bf4633f963d05b17c22596d5e2b608e0d1562