PAL/NTSC- is not the issue. The issue is matching frame rates. The Osmo 4K shoots- 1920 x 1080: 24p, 25p, 30p, 48p, 50p, 60p, 120p. So you should have no trouble matching another camera. 25p is useful only for broadcasting in PAL countries. If it’s destined for web use I suggest 24p.
Noah
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