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I typically resample the framerate to 30 when I'm encoding (much of my source video was streamed and has unreliable native framerate). But these 30.30 videos I tend to leave at 30.30 just because I don't know why it's like that and don't want to mess with it.

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    Never heard of it. I doubt that it’s common, but maybe in a certain niche? What source created the videos? Could your player software be misrepresenting the frame rate? Can you check with an alternate method? Commented Mar 5, 2021 at 16:15

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30.30 isn't a standard frame rate. I think you see it a lot because mobile phones (especially iPhones) only "target" certain frame rates, they don't necessarily perfectly deliver them.

https://www.provideocoalition.com/understanding-iphone-framerates-for-shooting-editing-distribution/

Interpreting a 30.30 frame rate video as 30fps won't cause significant issues unless the clip is longer than a few minutes, in which case you may have lip-sync issues with the audio vs the video.

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  • I don't mind keeping it at 30.30. I just like to know why I'm doing something. It tends to be streaming video, so my current assumption is that some popular software (maybe OBS) defaults to 30.30 or something.
    – felwithe
    Commented Mar 6, 2021 at 21:23
  • See this issue I had with Premiere introducing glitches into iPhone footage: video.stackexchange.com/questions/30683/…
    – tomh
    Commented Mar 6, 2021 at 21:24

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