MediaSeg

As a music producer I hit this constantly with long mixdowns and stem bounces that blow past upload caps — does it handle audio-only files (WAV/AIFF) too, or is it video-first for now? Local + ffmpeg stream copy is exactly the right call.

This solves a real workflow annoyance. Zoom recordings and long interview clips are exactly the kind of files that break upload limits constantly, and the existing options are either clunky web tools or rolling your own ffmpeg commands. The macOS-native angle is smart - nobody wants a browser tab for this. Shipped in 2 days from idea is impressive too. What's the largest file you've tested it on, and does it handle multi-track audio correctly after splitting?

This is one of those tools you don't think about until you hit 2gb uplload limit and waste time compressing everything.

stream-copy by size is the honest call — but when a cut lands mid-GOP, the next chunk opens with no i-frame, so anything that re-decodes per chunk (notebooklm) eats garbage till the next keyframe. snapping the boundary to the nearest keyframe is the usual escape hatch.

How big is the largest file you’ve run through? I’m curious where the limit is, with NotebookLM recordings I once struggled with 4GB files and the standard tools were crying.

Honestly the kind of thing where the whole pitch is just "yeah, I needed this and got tired of waiting." 😅 Hitting upload caps on long recordings is such a quiet, recurring papercut. And local + no re-encode is exactly the right call. Slick. Congrats on shipping it 👏

Does it split on keyframes to avoid glitches, or is it strictly by file size?

Local-first is the right default for long recordings. One positioning detail I would make very explicit: whether the split path uses stream copy vs re-encode. "Preserving quality" lands harder when people know the media is not being touched unnecessarily.

Anyone who’s wrestled a giant video file that won’t just upload knows exactly why it needs to exist. Simple, specific, useful. Good work!

MediaSeg is a local macOS utility that splits large media files into upload-ready chunks while preserving quality.

It was produced and directed with full AI assistance, and shipped in 2 days from idea to public release.

Feedback welcome on workflow clarity, screenshots, and positioning.