Introduction to rMux

What is rMux

rMux is a fast, lightweight video editor for macOS 14 or newer built to handle frequent media tasks — trimming clips, converting formats, extracting audio, and remuxing streams — without the sluggishness of heavyweight nonlinear editing suites.

Built entirely with native SwiftUI aligned with Apple Human Interface Guidelines, rMux embeds LGPL-compliant binaries of FFmpeg and ffprobe accelerated via VideoToolbox, delivering speed on both Apple Silicon and Intel Macs.

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Design Philosophy

1. Document-Less Direct Editing

Traditional suites force you to name projects (.vcedit, catalog files) even if you only need to trim a 10-second clip. rMux operates directly:

• Drag your video onto the app canvas or Dock icon.
• Set In and Out markers with I and O.
• Save: rMux writes your output directly to disk.

2. Lossless Direct Stream Copy

When you simply want to excise a segment without altering resolution or compression, rMux uses lossless stream copying: video and audio streams are re-encapsulated byte-for-byte without recalculating pixels. Processing finishes in fractions of a second, with 100% preservation of original fidelity.

3. Apple Silicon Hardware Acceleration

For transcode jobs, rMux delegates encoding to Apple Media Engine hardware circuits via Apple VideoToolbox (for H.264 and HEVC/H.265), maximizing export throughput while keeping energy consumption low.

4. Sandboxed Privacy

rMux runs within macOS App Sandbox, requires zero network connectivity, and contains no user analytics.