Panasonic Lumix S1R Operating Instructions Manual page 236

11. Recording Videos
All videos will be recorded using Long GOP to compress the images.
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The higher the bit rate value is, the higher the image quality becomes.
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Since the camera employs the VBR recording format, the bit rate is changed
automatically depending on the subject to record. As a result, the available
recording time is shortened when a fast-moving subject is recorded.
4K videos cannot be recorded when recording with [Miniature Effect] in [Filter
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Settings].
When recording 4K videos to an SD card, use a card rated at UHS Speed
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Class 3 or higher.
Depending on the connected TV, MP4 videos recorded with [4K/LPCM/150M/
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60p], [4K/100M/30p], [FHD/28M/60p] or [FHD/20M/30p] may not be played
back correctly.
You can register functions to Fn buttons:
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[ ] [
Quality] (l 278)
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] [Fn Button Set] [Setting in REC mode] [Motion Pic. Rec