SHIPPING HOLD · FILE://
This crate won't clear customs locally
MP4ever runs FFmpeg compiled to WebAssembly. The engine spawns a Web Worker, and browsers block workers from spawning when a page is opened directly from your disk (the URL bar says file://). That's a browser security rule, not something MP4ever can work around.
You have two paths forward:
RECOMMENDED · USE THE LIVE VERSION
Open MP4ever at its home on the Pirillo Arcade. It's the same app, served properly, no install:
https://arcade.pirillo.com/mp4ever.html
POWER USER · SERVE IT LOCALLY
If you want to run this exact file from your machine, serve it with a tiny local web server. From a Terminal, in the folder containing
mp4ever.html:python3 -m http.server 8000
Then open
http://localhost:8000/mp4ever.html in your browser.
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Your files
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Quality
For Final Cut, Premiere, Resolve. Balanced size & quality.
Advanced options All at preset defaults
Target size
Resolution
Encode speed
Tab is in the background — conversion is much slower. Switch back for full speed.