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A while back I posted about my disappointment in the quality of a Slo Mo video that I took on my iPhone. Well, that was my first attempt. Subsequent attempts have thrown up even more queries.

All the following are screen shots from Slo Mo videos played in QT. According to Photos, all were shot at 120 fps.

Can someone shed light on the following:

Why do the frame rates differ so much? From 102 in No 2 to 39 in No 7.
Why aren't the frame rates 120, as shown in Photos?
Why does the data rate vary from 6.85 Mbit/s in No 7 to 17.2 in No 2? I thought that it might be to do with light levels but No 2 and No 7 were similar conditions, but compare No 2 with No 1 for both data rate and frame rate on an overcast day and a bright and sunny day.


1.


2.


3.


4.


5.


6.


7.

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Home: PPC Mac Mini, 10.4.11, Intel Mac Mini 10.6.8, MacBook Pro(mid 2012): 12Gb, 10.14.6, White MacBook 10.8.4
iPhone 5S, iOS 11.3 Vodafone PAYG

Is frame rate average playback rate rather than recording rate?

Edit; scrap that. just had a look at couple of mine. One @119.9fps the other at 120.1fps. Makes no difference how much of it is set to slo-mo.

Edit2; the amount of slo-mo does make a difference to data rate.

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MacPro (2010) quad core macOS 10.15.7
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Home: PPC Mac Mini, 10.4.11, Intel Mac Mini 10.6.8, MacBook Pro(mid 2012): 12Gb, 10.14.6, White MacBook 10.8.4
iPhone 5S, iOS 11.3 Vodafone PAYG

Could it have anything to do with the speed at which you move the camera or what you're recording.

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Gary.

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Home: PPC Mac Mini, 10.4.11, Intel Mac Mini 10.6.8, MacBook Pro(mid 2012): 12Gb, 10.14.6, White MacBook 10.8.4
iPhone 5S, iOS 11.3 Vodafone PAYG