Off -- Use ID3 V1.1 tags instead of ID3 V1.0 tags
On -- Additionally write ID3 V2 tags, using a padding of ... 4 kb.
Off -- Use ID 3V2.4.0 tags instead of ID3V2.3.0 tags
On -- Use track format xx/xx in ID3V2 tags
If those are the options, here is what they mean:
- ID3 V1.0 is naturally the first version of ID3. The tag is limited to 128 bytes and goes at the end of the file. The fields for artist, title, etc are fixed length which makes V1.0 useless as a long name will be truncated to 30 characters.
- ID3 V1.1 simply adds the 'genre' field but it does so by assigning a single number to represent the genre. You'd have to look up the table to see what '7' means for genre, for example.
- The option to additionally write V2 tags simply says write a V2 tag in addition to writing a V1.0./1.1 tag. V2 tags go at the beginning of the file and can be any length and by that description it will be 4 kb in length. A typical tag is nowhere near 4 kb but since it will use 4 kb at the beginning of the file there is plenty of space for changing the tag and adding more properties without rewriting the whole file.
V2 tags are required for streaming because with a V1 tag at the end of the file, a player couldn't show you the tag information until it receives the whole file. IMO, V1 tags are absolutely useless and if you are able to inform EAC to not write a V1 tag you should do so. There are practically zero media players that only support V1 tags.
- Use track format xx/xx in V2 tags is probably referring to the properties track number/disc number. So if you have a double CD and the track is track 5 on disc 2, that information would be added to the tag.