MAC - Export - length does not work but _length does

[mjcm]

Just playing around with MAC and the export function.

For some reason length does not display anything, but _length does.

Any reason for that?

And a question if I may. I would like to add for example brackets around _length so it looks like this [2:56] how can I do that?

[ohrenkino]

The information about the length written by the ripper is a read-only property for MP3tag and can only be accessed with _LENGTH.
The field LENGTH which is part of the ID3 standard can contain anything.
To get something in square brackets, write them as '['%_length%']'.
See also the documentation about special characters:

Format Strings and Available Placeholders

Mp3tag uses format strings in various of its features to describe the structure of file names and imported data. A format string is built of either standard text (e.g., Music), placeholders (such as %artist%, %title%, ...), or slash characters / that usually denote directory structures. Characters with Special Functionality Some characters have special functionality and need to be treated with extra care. If you experience some unexpected behavior when using format string, check if some of t…

[mjcm]

Thx @ohrenkino

Appreciated