Different formats for external chapter files

[the_steve_randolph]

When I execute this code:

ffmpeg -i input -f ffmetadata chapters.txt

the format of chapters.txt looks like this (put into a "code" box to visually separate it):

;FFMETADATA1
major_brand=isom
minor_version=512
compatible_brands=isomiso2avc1mp41
encoder=Lavf58.78.100

[CHAPTER]
TIMEBASE=1/1
START=00
END=999
title=This is chapter 1

[CHAPTER]
TIMEBASE=1/1
START=1000
END=1999
title=This is chapter 2

[CHAPTER]
TIMEBASE=1/1
START=2000
END=2999
title=This is chapter 3

When I use Drax, and, tell it that I want to import a chapters file, it asks me to identify the format of the chapters file, and, the two formats look like:

00:00:00.000 Chapter 1
00:00:01.000 Chapter 2

CHAPTER01=00:00:00.00
CHAPTER01NAME=Chapter 1
CHAPTER02=00:00:01.000
CHAPTER02NAME=Chapter 2

and, there is a clickable box with this word: "Abbrechen"

I want to do some research on these different formats. Is there a name for each of these formats? When I Google "video chapter formats", I don't get anything that tells me about the different formats that I have shown above. How/where can I find out more about these formats?

[the_steve_randolph]

Anybody?

[Selur]

CHAPTER01=00:00:00.00
CHAPTER01NAME=Chapter 1
CHAPTER02=00:00:01.000
CHAPTER02NAME=Chapter 2

is the 'simple chapter format' using in mkvtoolnix, see: https://mkvtoolnix.download/doc/mkvmerge.html#mkvmerge.chapters
and ogg see: https://wiki.xiph.org/Chapter_Extension

;FFMETADATA1 ..

is the chapter format FFmpeg uses, see: https://ffmpeg.org/ffmpeg-formats.html#Metadata-1

00:00:00.000 Chapter 1
00:00:01.000 Chapter 2

iirc that is the chapter format MP4Box (GPAC) uses for .chp files

There are also tons of other chapter formats,...

[the_steve_randolph]

Thanks