[Feature Request] Note the Embedded Chapter Format

[LostOnTheLine]

One of the hardest things to do is get info on the Chapter format. I've recently been working with some that have poorly formatted chapters & were created by some AI tool, but I recently discovered an easy(-ish) way to do this with mp4v2 by using mp4chaps -lQ "input_file.m4b" & mp4chaps -lN "input_file.m4b". This lists only QT chapters with -lQ & only Nero chapters with -lN.

I just started using this & I love the display format, it makes it a pleasure to use, but I noticed this as a missing feature

An example of my suggested improvement

      chapters  - - - Nero - - -
┌───────────────────┬───────────┐
│      00:00:00.000 │ Chapter 1 │
│      00:00:12.345 │ Chapter 2 │
│      00:00:35.678 │ Chapter 3 │
└───────────────────┴───────────┘

      chapters [QT]
┌───────────────────┬───────────┐
│      00:00:00.000 │ Chapter 1 │
│      00:00:12.345 │ Chapter 2 │
│      00:00:35.678 │ Chapter 3 │
└───────────────────┴───────────┘

      chapters  (Nero | QT)
┌───────────────────┬───────────┐
│      00:00:00.000 │ Chapter 1 │
│      00:00:12.345 │ Chapter 2 │
│      00:00:35.678 │ Chapter 3 │
└───────────────────┴───────────┘

      chapters           Nero   |     (QT)
┌───────────────────┬───────────┬─────────────┐
│      00:00:00.000 │ Chapter 1 │ (Chapter 1) │
│      00:00:12.345 │ Chapter 2 │ (Chapter 2) │
│      00:00:35.678 │ Chapter 3 │ (Chapter 3) │
└───────────────────┴───────────┴─────────────┘

[sandreas]

Thanks for your suggestion. This COULD be done by utilizing the atldotnet Setting MP4_readChaptersFormat(https://github.com/Zeugma440/atldotnet/blob/63039fd780ebbae57c66ca63d7aff90120b4fa3f/ATL/Settings.cs#L227C27-L227C49)

• 1: QT Only
• 3: Nero only

They way that this would work NOW is:

• Load file with ATL.Settings.MP4_readChaptersFormat=1
• Store chapters in a temp list
• Load file again with ATL.Settings.MP4_readChaptersFormat=1
• Store chapters in another temp list
• Merge the two temp lists of chapters while storing which of them is QT and which is NERO

It would also be possible that the chapters are completely different depending on the format or only have slight differences.

Example:

      chapters           Nero   |     (QT)
┌───────────────────┬───────────┬─────────────┐
│      00:00:00.000 │ Chapter 1 │ (Chapter 1) │
│      00:00:12.345 │ Chapter 2 │             │
│      00:00:12.355 │           │ (Chapter 2) │
│      00:00:35.678 │ Chapter 3 │ (Chapter 3) │
└───────────────────┴───────────┴─────────────┘

Before I implement this manually, I'm going to ask if it would be possible to add a formats list to ChapterInfo, where we could look up what formats this chapter had been stored in. Maybe this would be a lot more efficient.