Change Default Duration/FPS only on Audio

Hello MKVToolNix People,
I want to mux an Audiofile from a DVD which is in 25fps to a 1080p BluRay Rip in 23,976fps but in the MKVToolNix GUI the Option of Default Duration/FPS is grayed out so i can’t make the Change for the 23.976fps on the Audio.
When I put 0,96 in the “Stretch by” field which must be the frame to get it to 23,976fps it gives an Error, because it could be devided by Zero.

How can i get the Audio to 23,976fps and why the Option of Default Duration/FPS is grayed out for Audio?

Greeting
Wax

Welcome!

The number formats in MKVToolNix aren’t localized. You must use . as the decimal point. Alternatively use fractions, which are more precise. Concretely: as 23.976 = { 24000 \over 1001 } you could simply calculate the precise factor as: { { 24000 \over 1001 } \over 25 } = { 24000 \over 25025 }

The correct syntax for mkvmerge is a simple 24000/25025.

Ok, thanks for the Reply.
I don’t understand the calculation but ok. Thats really complicated for me, why couldn’t the developers of mkwtoolnix GUI make the Point for Duration free so that there are the formulars behind to Change this. This is far more Userfriendly and with Video there is these Option to only choose from the Default Duration.
I tried to use the 24000/25025 but the Audio is still async, don’t know why.

OK found the failure, there are some Pics in the German BluRay which aren’t in the ITA BluRay. Must see if i can cut them to make it work.