Sony FS5 & FS700R – Why does my 4K Slow Motion Burst get recorded in 4K 60fps?

If you ever wondered why your 4K Slow Motion Burst recordings show up as 4K 60fps when you inspect their Metadata, here's why:

The 4K 120fps bursts get buffered in the camera which then proceeds to output it at 4K 60fps to our Recorder.

Once you drag this clip into your timeline and compare it to another 4K 60fps recording that's exactly 4 seconds long, you'll notice that the 4K 120fps burst (that has been conformed to 4K 60fps) will be 8 seconds long instead of the actual 4-second burst that you initially recorded. This is because the 120fps are now playing back at half the speed (50% / 60fps).

Here's how to double-check this: If you set the burst recording to double of its initial speed (200%) it should be back to 4 seconds in total length and be playing back at 4K 120fps.