Prerequisites¶

The Conform module's export engines rely on two third-party tools that must be installed separately. Neither is included with Scrub or Adobe Premiere Pro.

Tool	Required For	Free?
FFmpeg	Trimming non-R3D clips	Yes — open source
REDCINE-X PRO (REDline)	Exporting R3D (RED camera RAW) clips	Yes — requires RED account

If you only use Adobe Media Encoder for exports, neither tool is required.

FFmpeg¶

FFmpeg is a free, open-source media tool used by Scrub to trim clips with frame-accurate precision. It must be installed and accessible on your system before using the FFmpeg engine.

Install on macOS¶

The recommended method is Homebrew. If you don't have Homebrew installed, install it first:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Then install FFmpeg:

brew install ffmpeg

Homebrew installs the binary to /usr/local/bin/ffmpeg (Intel) or /opt/homebrew/bin/ffmpeg (Apple Silicon). Scrub auto-detects /usr/local/bin/ffmpeg — if you're on Apple Silicon, use Browse in the Conform settings to point to the correct path.

Verify the installation:

ffmpeg -version

You should see version info starting with ffmpeg version 7.x....

macOS Gatekeeper Warning¶

macOS may block FFmpeg when Scrub tries to call it from the command line, even if you can run it yourself in Terminal. This happens when the binary carries a quarantine flag from the download.

Fix — run this once in Terminal:

# Intel Mac (Homebrew default)
xattr -d com.apple.quarantine /usr/local/bin/ffmpeg

# Apple Silicon (Homebrew default)
xattr -d com.apple.quarantine /opt/homebrew/bin/ffmpeg

If you installed FFmpeg manually to a different location, replace the path with wherever your ffmpeg binary lives. You can find it with:

which ffmpeg

Then run:

xattr -d com.apple.quarantine $(which ffmpeg)

Note

FFmpeg installed via Homebrew usually doesn't need this — Homebrew strips the quarantine flag automatically. You're most likely to hit this if you downloaded a pre-built binary from ffmpeg.org manually.

Install on Windows¶

Option 1 — winget (built into Windows 10/11, recommended):

Open Terminal or PowerShell as Administrator and run:

winget install Gyan.FFmpeg

This installs FFmpeg and adds it to your PATH automatically.

Option 2 — Chocolatey:

If you have Chocolatey installed:

choco install ffmpeg

Option 3 — Manual install:

Download the latest build from ffmpeg.org/download.html (choose the Windows release from gyan.dev or BtbN)
Extract the zip to C:\ffmpeg
The binary should be at C:\ffmpeg\bin\ffmpeg.exe — this is where Scrub auto-detects it

Optionally, add C:\ffmpeg\bin to your system PATH so you can run ffmpeg from any terminal.

Verify the installation:

ffmpeg -version

After Installing¶

In Scrub's Conform settings, click Auto next to the FFmpeg path field. Scrub will scan the default locations and fill in the path if found. If auto-detection fails, click Browse and navigate to the ffmpeg (macOS) or ffmpeg.exe (Windows) binary manually.

REDCINE-X PRO (REDline)¶

REDCINE-X PRO is RED's official post-production application for R3D (RED camera RAW) footage. It includes REDline, a command-line tool that Scrub uses to debayer and export R3D clips.

Note

REDCINE-X PRO is only required if your project contains .R3D files from RED cameras. If you're not working with RED footage, you can skip this entirely.

Download¶

REDCINE-X PRO must be downloaded directly from RED's website. A free RED account is required.

Go to red.com/downloads
Sign in or create a free RED account
Download REDCINE-X PRO for your platform

There is no package manager installation for REDCINE-X PRO — the installer from RED's site is the only method.

Install on macOS¶

Open the downloaded .dmg file
Drag REDCINE-X PRO to your Applications folder
Launch it once to accept the license agreement

REDline will be located at:

/Applications/REDCINE-X Professional/REDCINE-X PRO.app/Contents/MacOS/REDline

Verify REDline is accessible:

"/Applications/REDCINE-X Professional/REDCINE-X PRO.app/Contents/MacOS/REDline" --version

macOS Gatekeeper Warning¶

Even if REDCINE-X PRO opens fine, macOS may still block the REDline binary when Scrub tries to call it from the command line. This is a separate Gatekeeper restriction — the app and its internal binaries each carry their own quarantine flag.

Fix — run this once in Terminal:

xattr -dr com.apple.quarantine "/Applications/REDCINE-X Professional/REDCINE-X PRO.app"

The -dr flags recursively remove the quarantine attribute from the entire app bundle, including REDline. After running this, Scrub can call REDline without macOS blocking it.

If you're unsure of the install path, you can find it with:

find /Applications -name "REDline" 2>/dev/null

Then substitute that path into the xattr command above.

Note

If REDCINE-X PRO itself was also blocked when you first opened it, you may need to allow it in System Settings → Privacy & Security → Allow Anyway before the xattr command will fully take effect.

Install on Windows¶

Run the downloaded installer
Follow the on-screen prompts (default install location is fine)

REDline will be located at:

C:\Program Files\REDCINE-X PRO 64-bit\Redline.exe

Verify REDline is accessible:

& "C:\Program Files\REDCINE-X PRO 64-bit\Redline.exe" --version

After Installing¶

In Scrub's Conform settings, click Auto next to the REDLINE path field. Scrub checks all standard install locations automatically. If not found, click Browse and navigate to REDline (macOS) or Redline.exe (Windows) inside your REDCINE-X PRO installation.

Quick Reference¶

Tool	macOS Default Path	Windows Default Path
FFmpeg	`/usr/local/bin/ffmpeg`	`C:\ffmpeg\bin\ffmpeg.exe`
REDline	`/Applications/REDCINE-X Professional/REDCINE-X PRO.app/Contents/MacOS/REDline`	`C:\Program Files\REDCINE-X PRO 64-bit\Redline.exe`

Both paths are where Scrub's Auto detection looks first. If your install is in a non-standard location, use Browse to set the path manually — Scrub saves it and remembers it between sessions.