[FeatureRequest] Flag to copy all tags

[rage1337]

Current behaviour
The tool copies standard tags from imported files, like author, genre, etc.

Requested change
Please introduce a possibility to include ALL tags given in the original. IMHO an additional flag would retain the current feature set, but an additional flag could be introduced to make this possible without breaking compatibility.

Desired behaviour
The tool copies standard tags from imported files, like author, genre, etc. by default, but also copies all other tags if specific flag is set.

Open questions

• What if the tag differs from chapter to chapter? Only one could be taken for the output file.
• Does the use of non-standard tag breaks the support of major services when used in m4b? In mp3 they are just ignored.

Use Case
I use AudiobookShelf. Besides being a great service for audiobooks, it features the possibility to create series. If the files are tagged with the non-standard series and series-part , a series will be created in the service. After the conversion from a working set of mp3 to a single m4b with m4b-tool, these tags are lost.

[sandreas]

After the conversion from a working set of mp3 to a single m4b with m4b-tool, these tags are lost.

Mhh, I did not know that. I'll try to reproduce this.

[a-jackson]

Having the same problem for the same reason, just spent an hour going crazy trying to figure why metadata has disappeared and it led me here.

[sandreas]

I'll try to take a look at this asap, sorry