How can an iPhone 11 video have a frame rate of 240.37 fps?

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Level 1

8 points

How can an iPhone 11 video have a frame rate of 240.37 fps?

I was out taking videos a couple of days ago and some are ~10x larger for the same time length as others. These show frame rates of 240.37 fps although others are at the standard rate of 29.97 fps. How is this possible? I noticed that the videos with that size and frame rate were also accompanied by .AAE files. I can provide screenshots of the properties details along with the text of the .AAE file associated with one of the videos showing those extreme frame rates but doing so here would exceed the 5000 character limit. I'm not aware of anything I did to cause this but I'm not an expert user of the camera on my new iPhone 11 so I could have done something without realizing it.

Windows, Windows 6

Posted on May 2, 2020 10:13 AM

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Answer 1

chuck_3rd

Community Specialist

May 3, 2020 11:23 AM in response to am11

Hey there, and welcome to Apple Support Communities, am11!

It sounds like your video files have different sizes, despite the time length being the same. I’d be happy to take a look!

Depending on the video type, the file may be larger and have a different frame rate than others. For example, if recording a slo-mo video or high resolution, the file size will be larger. Regarding the frame rate specifically, it sounds like this might have been a slo-mo video, which you can view the frame rates for recording that in Settings > Camera.

That being said, if you’ve made any edits to your videos, this can also change the file format and change the file size as well.

I hope that helps, and have a great day!

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Answer 2

am11 Author

Level 1

8 points

May 3, 2020 11:30 AM in response to chuck_3rd

Thanks. I realized after submitting this request what the problem was. At some point while recording some of these videos it appears my finger slipped and I started recording in super slow motion without realizing it. I realized this when I viewed the videos in the Photos app on my iPhone, which I had not done before downloading them to my hard drive. For some reason it is not evident when I view the videos on a computer. I am actually going to be extracting 10-second clips and processing those clips using software that compares frames to detect flow vectors in running water and once I start to do that I suspect it will be easy to see the actual number of frames in each clip and to thin them to get the frame rate I need.

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Answer 3

am11 Author

Level 1

8 points

May 3, 2020 2:02 PM in response to Community User

Yes, I figured out that I had accidentally started recording in slo-mo. The downloaded video doesn't show in slo-mo on a computer which is why I didn't realize this until I went back and looked at the videos on my Photos app.

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Answer 4

i_rina

Community Specialist

May 3, 2020 12:22 PM in response to am11

Thanks for the update, am11!

We're glad to hear that you were able to get that sorted. Please reach back out if you have additional questions.

Kindest regards.

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Answer 5

May 3, 2020 12:44 PM in response to am11

With the iPhone 11 you can record video in 720p @ 30fps, 1080p @ 30, 60, 120, 240 fps and also 4K at either 24 fps, 30 fps or 60 fps.

1080p @ 240p will be slo-mo.

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How can an iPhone 11 video have a frame rate of 240.37 fps?

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