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[Cellar] when is ChapterEndTime required

Dave Rice <dave@dericed.com> Wed, 28 March 2018 15:51 UTC

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From: Dave Rice <dave@dericed.com>
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Date: Wed, 28 Mar 2018 11:51:17 -0400
To: Codec Encoding for LossLess Archiving and Realtime transmission <cellar@ietf.org>
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Subject: [Cellar] when is ChapterEndTime required
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Hi cellar,

This is to follow up on a discussion on ffmpeg-devel, see: http://ffmpeg.org/pipermail/ffmpeg-devel/2018-March/227453.html. In the Matroska Schema, the ChapterTimeEnd element is optional, but in https://github.com/Matroska-Org/matroska-specification/blob/master/chapters.md#editionflagordered it says "If an Edition of Ordered Chapters is enabled then the Matroska Player MUST play those Chapters in their stored order from the timecode marked in the ChapterTimeStart Element to the timecode marked in to ChapterTimeEnd Element.”

So is ChapterTimeEnd required when EditionFlagOrdered=1? Is the second edition of the example below (from https://archive.org/download/chapters_test/chapters_test.mkv) invalid to write or invalid to read? Should we state a fallback end time (segment duration?) when there is no ChapterTimeEnd in an Ordered Edition?

|+ Chapters
| + Edition entry
|  + Edition flag ordered: 1
|  + Edition flag hidden: 0
|  + Edition flag default: 1
|  + Edition UID: 3475548369
|  + Chapter atom
|   + Chapter time start: 00:00:15.000000000
|   + Chapter time end: 00:00:20.000000000
|   + Chapter flag hidden: 0
|   + Chapter flag enabled: 1
|   + Chapter UID: 12865469183194029579
|   + Chapter display
|    + Chapter string: Random Red Ball
|    + Chapter language: eng
| + Edition entry
|  + Edition flag ordered: 1
|  + Edition flag hidden: 0
|  + Edition flag default: 0
|  + Edition UID: 12338659363134957115
|  + Chapter atom
|   + Chapter time start: 00:00:00.000000000
|   + Chapter flag hidden: 0
|   + Chapter flag enabled: 1
|   + Chapter UID: 17174098126947929771
|   + Chapter display
|    + Chapter string: Full
|    + Chapter language: eng

Dave Rice

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