Hello, Patch in attach add suport for reading ALFA udta set (at least), by Adobe Software and for writing it.
Theses two patch, can keep the original metadata when remuxing it And the user can force the value using -metadata alpha= In order to have the right alpha mode set when importing the mov file in Adobe Software. //Force set alpha straight ./ffmpeg -i inputFile -vcodec copy -metadata alpha="straight" targetFile.mov //Force set alpha premult ./ffmpeg -i inputFile -vcodec copy -metadata alpha="premult" targetFile.mov Example of file with this metadata can be found here https://we.tl/dil4NvXMS0 Martin
0004-avformat-mov-add-support-for-Adobe-Alpha-metadata-pa.patch
Description: Binary data
0005-avformat-movenc-add-support-for-writing-alpha-metada.patch
Description: Binary data
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