What is Reddit's opinion of ID3Fixer?

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No problem. I suggest you get an ID3 tag editor (like this one), so you can set the ID3 tags (title, artist, album, album art, etc.) as the YouTube Downloader doesn't set them.

Maybe it's the version of the ID3 tags? Try setting the tags with MP3Tag, or on your phone with ID3Fixer.

You'll need an app like ID3Fixer to edit the ID3 tags of the files. This can also be done on your computer more quickly with MP3Tag.

Hmm, I have similar issues too. For me it appears to happen randomly to any file and is independent of whether the file was added recently or not.

I started using Android when KitKat was new and I've had this issue from day one. I still have it today on Nougat. Although for me, all the tags are fine in Windows. Some files are missing tags or artwork on Android and sometimes some tags are truncated (missing a character or a word).

I've also been having the issue of some songs having "0:00" length. The songs would play normally if I played from the start and don't skip to somewhere in the middle. The song would show it's progress normally but the total song length would still be 0:00 (for example, 2:50/0:00). If I tried to skip backward or forward to an earlier or later part of the song, the music player would think the song was over and start playing the next song in the queue.

I did some testing with updating tags and it seems like Android keeps like a "library" of tags that doesn't update when you try to locally update a tag. Maybe this is just for me though but in my case, I changed a tag of a file from my device on Windows with the same name and copied it back to my phone. The tags didn't update to the new tags, instead showing the old tags from before. In other words, if I copied a file that was never ever on my device before and it's incorrectly tagged, it would be near impossible to fix the tags. This also applied to artwork as well.

I've been very frustrated with this issue and tried many things to resolve it. I tried using ID3Fixer to try to fix them and it partially worked. Some files it did manage to fix the tags but some files were stubborn and refused to be fixed, and the fixed files now had missing artwork or truncated tags. I also tried using Musixmatch's inbuilt tag editor to fix the tags and album artwork, but like before some files were stubborn and refused to be fixed.

I then started testing other music player apps and found out that most other apps read music tags from that "tag library" I mentioned from before, similar to the Play Music app and missing tags here and there. I did however find two apps that read tags "directly" from the file. These apps were Poweramp and Shuttle. I knew the tags on the files were definitely correct because I checked the files in Windows and only these two apps correctly read the tags from the files. There may be other apps that do this that I've yet to discover. Knowing this, I bought Shuttle+ from the Play Store and to this day it's my music player app. Shuttle still displays some songs to be 0:00 length and I've yet to find a fix for this.

So yeah, try ID3Fixer and changing music player apps to see if it fixes your tagging problems. Hope this helps.

ID3Fixer

I remember using an app called ID3Fixer a while back for MP3's. However, I'm not sure what would work for your FLAC files.

I know that PowerAMP music player can do this. ID3Fixer would work if you copy and paste into the comment section of the ID3 tags.

MP3Tag can fix the tags.

ID3Fixer will do this without a computer.

GPM doesn't have a way to edit ID3 tags. You can use ID3Fixer though.