27 August 2026

436m closed_captions pages must share a magazine

Added 436m page magazine requirement

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For multiple 436m <closed_captions> blocks

All 436m <closed_captions> blocks must use values from the same teletext magazine, i.e. sharing the same first digit — 777, 778, 779 and so on. Pages taken from different magazines (for example 177 and 777) are rejected. Valid page values are 100 to 899.

A single output format may contain at most 20 436m <closed_captions> blocks; requests with more are rejected.

Also updated the page parameter description to mention the same-magazine requirement, and the mux_type description of 436m to mention the 20-block limit.