The case is;
I have noticed that some tags are not saved to the fuile metadata (specially for mp4 files) , for example Tone (or BPM in mp4).
Is there a way to intercept this output from picard and store it to an empty tag in the file?.
I update the tags with MusicBraibz Picard and once updated, the tags are shown in that program (reading the updated file), but I can not get any information in tags such as ARTIST, BPM and some more with TagLibSharp.
I am using C# and i can perfectly read these tags from mp3 files. The problem is on mp4.
Any suggestion?
mgomez00
commented
4 years ago 
Hello,
I originally opened a post at https://community.metabrainz.org/t/newbie-first-day-first-question/491935/3 about this issue, but after a short discussion with one of the member he suggested thet I bring the issue here,
The case is; I have noticed that some tags are not saved to the fuile metadata (specially for mp4 files) , for example Tone (or BPM in mp4). Is there a way to intercept this output from picard and store it to an empty tag in the file?.
I update the tags with MusicBraibz Picard and once updated, the tags are shown in that program (reading the updated file), but I can not get any information in tags such as ARTIST, BPM and some more with TagLibSharp. I am using C# and i can perfectly read these tags from mp3 files. The problem is on mp4. Any suggestion?
Thanks