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Video files' sizes rounded up to the nearest ~32MB (A7Cm2)

ppp33
in Sony Alpha Video Discussion

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Hi,

Last year I switched from Nikon to Sony (A7Cm2) and this situation surprised me in an unpleasant way.
When I travel, I record rather short 8-30 seconds clips, a lot of such clips.
And found that these files are rather big because of rounded up to the nearest ~32MB.
Different SD cards (64GB) fill up very quickly because of that behavior.

Sample sizes for different durations of those clips, for example I have 700 clips with these "distinctive" sizes +/-, nothing in between
33,592,255
67,149,921
100,706,705
134,367,160
167,821,451
201,378,823
234,936,491
268,594,590
302,050,059
335,709,042
... and so on
+/-1000 for the smaller files up to +/-100,000 for the bigger ones rounded up to the nearest ~32MB 
Different 64GB cards were formatted inside the camera with exFAT (allocation unit size is 128KB)

Why is that?
Is there some setting for that? 
--
Piotr

Edited by ppp33

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https://www.sonyalphaforum.com/topic/21551-video-files-sizes-rounded-up-to-the-nearest-~32mb-a7cm2/
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