I know this is an old(er) topic, but since the topic araised again in the german section I wanted to post my solution here as well:
Mp3tag has the very useful Tools feature which allows to call external programs from inside mp3tag.
With this it is possible to extend mp3tag with metafalc features:
- in the menu bar select File -> Options...
- in the left panel select Tools
- click the "New" button
- choose a name so you can identify your new tool
- select the path to the metaflac.exe (part of the flac for windows command line tools: FLAC - Downloads)
- add the parameters (metafalc parameters, mp3tag tools parameters)
Metaflac doesn't support two major operations at the same time so to reduce the padding and afterwards restore the standard padding size it's necessary to use two different "Tools":
Tool 1: This is to remove the embedded cover(s) (if present) and reduce the padding size so the space which was occupied by the cover is no longer used
Name: METAFLAC: remove covers; shrink padding
Path: ...\path\to\metaflac.exe
Parameters: --remove --block-type=PICTURE,PADDING --dont-use-padding "%_path%"
Tool 2: This restores the standard padding size of 8192 bytes. (Files with audio stream > 20mins normally uses a standard PADDING of 65536 bytes; You can specify a third Tool for this if you want)
Name: METAFLAC: restore std. padding size
Path: . ..\path\to\metaflac.exe
Parameters: --add-padding=8192 "%_path%"
make sure that for both tools the for all selected files is checked
Afterwards the scripts can be found in the context menu (right click) under Tools. The commands are executed for every selected file.
You have to run Tool 1 first and afterwards Tool 2.