Read/write video files' metadata using QtAV/ffmpeg

[Andrey Goreev]

Hello,

Looks like as long as libavformat/avformat.h presented in the appimage
digiKam can read/write video files' metadata via calling the library
directly from c++.

Here is an example:
https://stackoverflow.com/questions/45050177/adding-metadata-informations-with-ffmpeg

Also looks like ffmpeg is capable of writing whatever tag you want in the
mdta atom:
http://www.ffmpeg-archive.org/Write-QuickTime-tags-td4680508.html

Can this help closing the gap left by exiv2 ?

Best regards,
Andrey
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