Panasonic HC-V770 Owner's Manual page 122

To stop converting to MP4 halfway
Touch [CANCEL] during format conversion.
To exit the MP4 conversion
Touch [Return].
≥ A scene recorded over a long time may take time.
≥ Scenes recorded in AVCHD exceeding 4 GB (approx.) or 30 minutes (approx.) will be
automatically divided when converted to MP4 scenes and copied.
≥ If you convert protected scenes to MP4, their protection will be cleared after the conversion.
≥ Scenes recorded as Backup for Twin Camera will be saved as normal MP4 scenes when
converted to MP4 scenes and copied.
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