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The PNGv3 Specification Draft [1] has changed the capitalization of mDCV and cLLI chunks (formerly mDCv and cLLi). This patch updates FFmpeg to work with the new chunk names while retaining decode-side compatibility with files created using the old names. [1]: https://w3c.github.io/png/ Signed-off-by: Leo Izen <leo.izen@gmail.com>