Panasonic DMC-FZ1000 - Manual (Page 220)

10. Recording Motion Pictures
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• The picture aspect ratio will be fixed to [16:9].
Not available in these cases:
• This function is not available in the following cases:
– When [Rec Format] is set to [VGA/4M/30p] in [MP4]
– When [AVCHD] in [Rec Format] is set to [FHD/24M/24p] (only when [ (Still picture
priorities)] is set)