I think the algorithm is probably incorrect. A number starting with 0 should be ...

crazygringo · 2025-09-28T17:19:26 1759079966

That's not the issue.

The issue here is that one camera appends milliseconds to the seconds without a separator, and the other uses a separator.

So of course the ones that include milliseconds look like bigger numbers and get sorted last.

Leading zeros aren't the issue here.

re · 2025-09-28T16:53:13 1759078393

> Otherwise you have a situation where img_1_01.jpg and img_01_1.jpg does not have a complete ordering.

(Good) "natural sort" implementations generally have ways of handling ties like this. It's similar to the problem of case-insensitive sort over case sensitive sets.

gregates · 2025-09-28T16:22:16 1759076536

It wouldn't be the first time widely-used software sorted numbers by a function that does not produce a total ordering. For example, Excel: https://gregat.es/excel-numeric-order-transitivity/