Why can't I shoot ProRes? What is 'releasing resources'?

I believe that users of the iPhone Pro series know that the new phone has the Pro Res function, which is a format designed for post-production video. However, because this format takes up a huge amount of space, it only has a capacity of 256GB or above. It can be fully used, but what exactly is the "released resource" that occurs when using it? Let me explain it to you now.

Automatically start when the capacity is insufficient

"Release resources" is an automatic function in the iPhone iOS system. Helps you automatically delete some useless data when the device capacity is insufficient, or keep the files in the photo album as optimized files to free up space to meet the huge demand of Pro Res. Generally, it will only be activated when the device capacity is insufficient for 5 minutes of photography. .

However, when I used it, the space was at least 150 GB or more, and I still activated the "Release Resources" function, so I don't know what the real triggering mechanism is.

You cannot record videos when starting up

You can see before and after execution that the maximum recording time will continue to increase

The capacity will also increase after release

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