Put the synced lyrics in the right tag

[Piripe]

Requested Feature

Currently, Spotdl put the synced lyrics in the USLT tag, but the right tag for synced lyrics (according to the ID3 documentation https://id3.org/id3v2.3.0#Synchronised_lyrics.2Ftext) is SYLT.

Possible implementation

You could consider synced and unsynced lyrics as two completely different tags, so, you could make possible to save both, synced and unsynced lyrics, in the same file.

[xnetcat]

Code for this is ready. But I've decided not to include it because I couldn't find many clients to test it with, if you know any please let me know.

[Piripe]

I know 2 clients that support synced lyrics, foobar 2000 and MusicBee (I personally tried using foobar 2000 but I also seen someone on Reddit saying that MusicBee supports synced lyrics, but I didn't try it)

Note: In foobar 2000 you have to go in the song properties to see synced lyrics.

[xnetcat]

Ok so I've put synced lyrics to the SYLT tag

MusicBee + MiniLyrics plugin works

Foobar2000 doesn't, because foobar2000 doesn't support SYLT tag? idk

[xnetcat]

Either way since v4.1.5 spotdl will write synced lyrics to both USLT and SYLT tags for better compatibility between audio players.

[Piripe]

I just tried it (using the dev branch) and it works perfectly with my phone's main media player (Musicolet)

[xnetcat]

So it didn't work before including SYLT tag? So that means that the SYLT tag does it's job.