Download and install the latest version of Filestar.
Right click on one or more M4b file(s) on your desktop and select Convert with Filestar.
Type split into stems in the search box.
Press Split.
Or let an AI agent do it: filestarcli -i file.m4b -c "split into stems" (how).
Let your AI agent split M4B into stems
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Use Filestar to split M4B into stems in my Downloads folder”
Or run it yourself:
filestarcli -i file.m4b -c "split into stems"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent split M4B into stems?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.m4b -c "split into stems" on your computer, so your files stay on it.
It is an audiobook file compressed using .AAC algorithm based on MPEG-4 container format. It is similar to .M4A file but its denoted as an audiobook and supporting audio players can bookmark it.
