You cannot trust if your footage is VFR (Variable Frame Rate). So check your footage first.

@MReFIN
I tried it with the same type of file as you did.
All went normal, no problem with "Match Media Settings", look

@j-v: yes, that's what happens to me also but Gopro says that the frame rate should be 24 fps. I'm kind of wondering whether it is truly 24 fps (and Vegas gets it wrong) or 23.976 (and Gopro states it wrongly in their tech specs).

@fifonik: how can I check whether video is of variable frame rate? But I do not think that Gopro is.

And I'm not sure here whether the media info is misinterpreted since I do not know whether it really is 24 fps or something else.

(edit: changed the wrong fps of 29.976 to 23.976, sorry for inconvenience...)

@MReFIN 24 fps Gopro is actually 23,976 fps (and not 29,976 fps) as Vegas correctly interprets.

Gopro files are constant frame rate and not variable frame rate.

And what is your problem if that should be the case, or do you think you can see the difference?
Rendering with Vegas and setted the render to 24fps delivers you a 24fps file.

And what is your problem if that should be the case, or do you think you can see the difference?
Rendering with Vegas and setted the render to 24fps delivers you a 24fps file.

Probably he will see a difference, because when 23,976 fps is rendered as 24,000 fps, smart resampling becomes active (when not manually disabled) and will cause slower rendering and ghost imaging.

And what is your problem if that should be the case, or do you think you can see the difference?
Rendering with Vegas and setted the render to 24fps delivers you a 24fps file.

24 fps video does not play on 29.97 fps TV sets or TV monitors. But 23.976 fps can be made to play on 29.97 fps monitors without frame problems

For many years, I've felt sorry for those regions that have to deal with, what are to me, inexplicably different frame rates like 29.97, 23.976, 59.94, 30 and 24 fps. How can a frame miss .03, .06 or .024? Going back to analogue TV, I took it that NTSC (especially in the USA) was 30 fps because it related to the power supply being 60 Hz (cps) whereas PAL (in UK, AU, NZ for example - and Germany where PAL was developed) was 25 fps because the power supply was 50 Hz (cps).

Though I haven't investigated this too much, I'd love to know why there are all these different frame rates in what I suppose to be NTSC regions. If anybody has a link to an overview of how this came about, I'd be most appreciative.

In PAL land, it's so much less complicated with the choice being 25 and 50 fps

from memory pal has higher video bandwidth than ntsc. When color was introduced ntsc with it's lower bandwidth had to compromise and needed to reduce fps to add color info, but pal did not have to compromise so remained at 25fps

@MReFIN 24 fps Gopro is actually 23,976 fps (and not 29,976 fps) as Vegas correctly interprets.

Gopro files are constant frame rate and not variable frame rate.

Yes. Sorry in my op I should've said 23.976, NOT 29.976... My bad.

But if it is 23.976, then I'm good :D

Thanks for everybody :)

Thanks @Former user … you've jogged my memory a bit. I vaguely recall from the 70s that there was also a technical difference - vertical sync? or something like that - that made PAL more reliable color-wise than NTSC. Although NTSC is the initialisation for the National Television Standards Committee, it was sometimes ironically referred to in the 70s as "Never Twice the Same Color" as I recall.

Sorry for hijacking the original topic, I've now posted my issue as:

https://www.vegascreativesoftware.info/us/forum/why-so-many-different-frame-rates-with-ntsc--120618/