Title pretty much sum it up. Once you are satisfied with your metadata, artwork etc it would be nice to save those data to your MP4/M4V file. In case you need to re-scan your media your library will get populated the way you want. Batch processing would be interesting as well as the button …

I'm pretty sure there is a utility for this. Have a look in the developers section. Granted it is not built in PMS but could be made into a plugin ?!?! here

PMS/Web UI ability to embed PMS held metadata in to mp4 file

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PMS/Web UI ability to embed PMS held metadata in to mp4 file

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