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JavaFX - .mp4 files don't contain metadata?

Zällä Feldmann
Posts: 4
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I've been trying to get the metadata from my video files which the user can select. Here's a part of my method:

It returns an empty list: {}
Otherwise if I'm trying to get the values by a specified key, it will return null.

Bizarrely it works fine when I'm taking .mp3 files. Of course I made sure that my .mp4 files have some data / information in their properties, if you know what I mean.
I've also tried the version with a MapChangeListener, didn't work out as well.

I hope you do understand my problem and can give me some useful tips. This is my first post so please correct me if necessary.
Thanks in advance.
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