It would be helpful if people have tagging issues to post a couple of examples of the actual tags, there are a couple for freely available tools for MacOS and Windows.
exiftool
andy@mac-pro Poland % exiftool 1-01\ Poland.m4a
ExifTool Version Number : 12.67
File Name : 1-01 Poland.m4a
Directory : .
File Size : 124 MB
File Modification Date/Time : 2022:07:05 11:31:45+01:00
File Access Date/Time : 2023:10:02 09:50:23+01:00
File Inode Change Date/Time : 2022:07:05 11:31:45+01:00
File Permissions : -rwx------
File Type : M4A
File Type Extension : m4a
MIME Type : audio/mp4
Major Brand : Apple iTunes AAC-LC (.M4A) Audio
Minor Version : 0.0.0
Compatible Brands : M4A , mp42, isom
Movie Header Version : 0
Create Date : 2022:07:05 11:30:38
Modify Date : 2022:07:05 11:31:45
Time Scale : 44100
Duration : 0:22:36
Preferred Rate : 1
Preferred Volume : 100.00%
Preview Time : 0 s
Preview Duration : 0 s
Poster Time : 0 s
Selection Time : 0 s
Selection Duration : 0 s
Current Time : 0 s
Next Track ID : 2
Track Header Version : 0
Track Create Date : 2022:07:05 11:30:38
Track Modify Date : 2022:07:05 11:31:45
Track ID : 1
Track Duration : 0:22:36
Track Layer : 0
Track Volume : 100.00%
Matrix Structure : 1 0 0 0 1 0 0 0 1
Media Header Version : 0
Media Create Date : 2022:07:05 11:30:38
Media Modify Date : 2022:07:05 11:31:45
Media Time Scale : 44100
Media Duration : 0:22:36
Media Language Code : und
Balance : 0
Audio Format : alac
Audio Channels : 2
Audio Bits Per Sample : 16
Audio Sample Rate : 44100
Handler Type : Metadata
Handler Vendor ID : Apple
Title : Poland
Artist : Tangerine Dream
Album Artist : Tangerine Dream
Album : Poland
Genre : New Age
Track Number : 1 of 2
Disk Number : 1 of 2
Content Create Date : 1984
Compilation : No
Play Gap : Insert Gap
Beats Per Minute : 0
Encoder : Music 13.2.4.3
Audio Encoding Params Version : 1
Audio Bit Rate Control Mode : 3
Audio VBR Quality : 0
Volume Normalization : 27B 2F9 3A0C 55DE 5DF7D 61E70 7FFF 7FFF 5E008 6428A
CDDB1 Info : 1309F702+191475+2+150+101857
CDDB Track Number : 1
Media Data Size : 123759071
Media Data Offset : 77824
Avg Bitrate : 730 kbps
CDDB Disc Play Time : 0:42:31
CDDB Disc Tracks : 2
andy@mac-pro Poland %
ffprobe part of ffmpeg
andy@mac-pro Poland % ffprobe -v quiet -of json -show_entries format 1-01\ Poland.m4a
{
"format": {
"filename": "1-01 Poland.m4a",
"nb_streams": 1,
"nb_programs": 0,
"format_name": "mov,mp4,m4a,3gp,3g2,mj2",
"format_long_name": "QuickTime / MOV",
"start_time": "0.000000",
"duration": "1356.093333",
"size": "123836895",
"bit_rate": "730550",
"probe_score": 100,
"tags": {
"major_brand": "M4A ",
"minor_version": "0",
"compatible_brands": "M4A mp42isom",
"creation_time": "2022-07-05T11:30:38.000000Z",
"title": "Poland",
"artist": "Tangerine Dream",
"album_artist": "Tangerine Dream",
"album": "Poland",
"genre": "New Age",
"track": "1/2",
"disc": "1/2",
"date": "1984",
"compilation": "0",
"gapless_playback": "0",
"encoder": "Music 13.2.4.3",
"Encoding Params": "vers",
"iTunNORM": " 0000027B 000002F9 00003A0C 000055DE 0005DF7D 00061E70 00007FFF 00007FFF 0005E008 0006428A",
"iTunes_CDDB_1": "1309F702+191475+2+150+101857",
"iTunes_CDDB_TrackNumber": "1"
}
}
}
andy@mac-pro Poland %