MediaSeg is a local macOS utility that splits large media files into upload-ready chunks for practical, size-limited upload workflows.
It is built for long-form media that needs to fit into upload limits, including NotebookLM and similar size-limited workflows, while keeping processing local and straightforward.
02App Screenshots
App Screenshots
03Whats New
Whats New
v.1.2.0
Language support (EN, JP, VN)
Theme support (Dark, Light, NeonTokyo)
v1.1.0
MOV is now officially supported
M4A, MP3, and WAV are available as experimental support
Bundle FFmpeg / FFprobe
04What it does
What it does
Native macOS app
Practical local workflow for large-file splitting
MP4 stream-copy split path without re-encoding
WEBM conversion to MP4 before local splitting
MOV support with MOV output
Experimental support for M4A, MP3, and WAV
Custom output folder support
Predictable output handling for normal and handled error paths
05Use Cases
Use Cases
MediaSeg is useful for long recordings, meeting captures, lectures, webinars, and other large media files that need to fit into size-limited upload workflows, including NotebookLM.
06Download and Feedback
Download and Feedback
Download the latest release on GitHub. Release builds bundle FFmpeg / FFprobe under the LGPL, and matching FFmpeg source and build-configuration files are provided alongside the release artifacts. For feedback, bug reports, or workflow questions, open a GitHub Issue. If possible, include your app version, macOS version, steps to reproduce, and session log.
