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4 num_plays (unsigned int) Number of times to loop this APNG. 0 indicates infinite looping.
`num_frames` indicates the total number of frames in the animation. This must equal the number of `fcTL` chunks. 0 is not a valid value. 1 is a valid value for a single-frame APNG. Even if the default image is not part of the animation it is still counted in num_frames. If this value does not equal the actual number of frames it should be treated as an error.
`num_plays` indicates the number of times that this animation should play; if it is 0, the animation should play indefinitely. If nonzero, the animation should come to rest on the final frame at the end of the last play.
