I am transcoding a bunch of of my ripped CDs (FLAC) and my purchased albums (m4a) into a much lower bitrate/smaller file size to transfer them to a device with limited storage. For that purpose, I am using a custom batch script + a CLI AAC encoder that outputs mp4/m4a files. This encoder writes a ITUNSMPB tag that ensures gapless playback.
Now, post-encoding, I am loading each album's original and transcoded tracks in mp3tag and performing a tag "copy/paste". This operation then results in the ITUNSMPB tags of the new tracks to be overwritten if present in the original tracks or removed altogether if not present in the original tracks.
What I need is to copy all other tags except the ITUNSMPB one, which I want to be kept intact in the new files. Is there a way to do this?
Thanks in advance...