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Let me guess, the numbers are in milliseconds,

Those are the MKV timestamps in units of nanoseconds. Yes they are the starting and ending frames of the range.

So your range included ~7200 seconds = 120 minutes.

Does it agree?

Of course, the trailing zeroes are the micro and then nano seconds.
Thanks for clearing it up for me, even when I am on the right track I sometimes miss the obvious.
P.S.
It also works perfectly for hevc in mkv
I am learning more about the capabilities of your tools everyday

I try my best to do the right things.

Two points:

1. An MKV can specify a TimecodeScale other than the default of 1000000. IIRC I handle it correctly.

2. One day I would like to do the video and audio demux as a single pass.

IIRC I handle it correctly.

Tested your timecodes on a fully muxed mkv by splitting it in mkvmerge with your time stamps, and as far as I can tell it comes out perfect

OK, but I meant I also handle non-default TimecodeScale correctly. Do you have any MKVs with that?

BTW, the MKV spec is a fun and useful read for grokking the deep internals.

https://matroska.org/technical/index.html

No funky mkv's. I like to keep things neat, straightforward and simple.
Much easier that way.
Once again, thank you for your help

Sure you wouldn't make one with a non-default scale, but I have seen them in the wild.

Your thoroughness is admirable Don, once again, thanks for your patience and help.
Your software keeps impressing me more all the time
As I learn a little more and wish to go further your tools step up and show that they can do more than I realized

And I will try to remember for next time to count the trailing zeroes, milli >micro > nano

Thanks, Luis.