6 minutes & 56 seconds, or 416 seconds. There would also be 55 additional frames, with four missing to reach another second. To find the result, follow these steps:
Find the quotient and remainder of the division between frame number and frame rate:
25015 / 60 = 416,
with remainder 55.
55 is the number of excess frames before the next second.
416 is the number of seconds from the beginning of the video.
Find the quotient and remainder of 416 divided by 60 to find minutes (6) and seconds (56) of the timestamp.
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