Issue with the VTT file used in 0219 using-caption-file

[glenrobson]

Recieved via the website:

"I have a question about cookbook recipe https://iiif.io/api/cookbook/recipe/0219-using-caption-file/. In trying to fulfill this recipe with the Aviary IIIF Player, I notice that the VTT in the JSON manifest is invalid. It does not match the WebVTT standard (https://www.w3.org/TR/webvtt1/#introduction-other-features). It is my understanding that whenever there is a cue identifier, as is the case with this manifest VTT, there should be 2 empty lines between the previous cue payload and the following cue identifier. This example only has a single empty line. Am I misunderstanding the standard? "

[glenrobson]

This is the VTT file:

https://fixtures.iiif.io/video/indiana/lunchroom_manners/lunchroom_manners.vtt

[glenrobson]

I can't find the 2 empty lines part of the specification. It seems to say the following for cue identifier blocks:

"A WebVTT cue block consists of the following components, in the given order:

• Optionally, a WebVTT cue identifier followed by a WebVTT line terminator.

• WebVTT cue timings.

• Optionally, one or more U+0020 SPACE characters or U+0009 CHARACTER TABULATION (tab) characters followed by a WebVTT cue settings list.

• A WebVTT line terminator.

• The cue payload: either WebVTT caption or subtitle cue text, WebVTT chapter title text, or WebVTT metadata text, but it must not contain the substring "-->" (U+002D HYPHEN-MINUS, U+002D HYPHEN-MINUS, U+003E GREATER-THAN SIGN).

• A WebVTT line terminator."

From: https://www.w3.org/TR/webvtt1/#file-structure