The mdcv atom isn't in ISO/IEC 14496-12:2015 so the flag is marked as experimental and the mdcv atom is not written by default.
The mdcv atom is referenced by e.g., [1][2] and is already parsed in FFmpeg in mov.c. Once ISO/IEC 14496-12 standardizes the mdcv atom (which I assume it will?) then we can switch this to write the mdcv atom by default (if the metadata exists) and remove the write_mdcv flag. [1]: https://aomedia.org/wp-content/uploads/2018/09/AV1-ISO-Base-Media-File-Format-Binding-Specification.pdf [2]: https://developer.apple.com/av-foundation/High-Dynamic-Range-Metadata-for-Apple-Devices.pdf
0001-avformat-movenc-add-write_mdcv-flag-to-write-mdcv-at.patch
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