Correct — look in the bottom left of the thumbnail screen and you’ll see a logo denoting what the format of the clip is. You need to go to camera mode and match menu #5’s REC FORMAT to match the clip you want to play back.
Sounds like a bit of a hassle, but it really only affects you when using multiple formats on the same card — I originally thought it was a big inconvenience, but quickly figured out that the only times I’m really doing multiple formats on the same card is for my various testing purposes. In real-world shooting we almost always pick one format/rec mode and stick with it. And in that case, you’ll never see the red numbers and won’t have to worry about matching the rec format.
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