user20647: 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.

user4426: 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.

20647: <p>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.</p>
 4426: <p>30.30 isn't a standard frame rate. I think you see it a lot because mobile phones (especially iPhones) only &quot;target&quot; certain frame rates, they don't necessarily perfectly deliver them.</p>
<p><a href="https://www.provideocoalition.com/understanding-iphone-framerates-for-shooting-editing-distribution/" rel="nofollow noreferrer">https://www.provideocoalition.com/understanding-iphone-framerates-for-shooting-editing-distribution/</a></p>
<p>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.</p>
