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The `fcTL` chunk is an ancillary chunk as defined in the PNG Specification. It must appear before the `IDAT` or `fdAT` chunks of the frame to which it applies, specifically:
* For the first frame, if the `fcTL` chunk is present it must appear before the first `IDAT` chunk. Position relative to the `acTL` chunk is not specified.
* For the second frame, the `fcTL` chunk must appear after the `IDAT` chunks from the first frame and before the fdAT chunks for the second frame.
* For any subsequent frames, the `fcTL` chunk for the frame N must appear after the `fdAT` chunks from the frame N-1 and before the fdAT chunks for the frame N.
