"Convert to mp4" from macOS context menu

README.md

"Convert to mp4" from macOS context menu

Setup

1. Launch "Automator", then "New" > "Quick Action"
2. "Workflow receives current files or folders in Finder"
3. "Pass input: as arguments"
4. Paste the content of convert_to_mp4.sh into the shell vie
5. Save the workflow

convert_to_mp4.sh

#!/bin/bash

# Commands
FFMPEG="/opt/homebrew/bin/ffmpeg"
NOTIFY="/opt/homebrew/bin/terminal-notifier"

# Make sure PATH includes Homebrew
export PATH="/usr/local/bin:/opt/homebrew/bin:/usr/bin:/bin:/usr/sbin:/sbin"

# Ask user for scale
SCALE_INPUT=$(osascript -e 'display dialog "Enter scale (e.g. 1280:-1)\nLeave blank for original size:" default answer ""' -e 'text returned of result')

# Trim spaces (just in case)
SCALE_INPUT=$(echo "$SCALE_INPUT" | tr -d '[:space:]')

# Automatically fix odd-dimension issue: replace ":-1" with ":-2"
SAFE_SCALE=$(echo "$SCALE_INPUT" | sed 's/:-1$/:-2/')

last_out=""

# Process each selected file
for f in "$@"
do
    dir=$(dirname "$f")
    base=$(basename "$f")
    name="${base%.*}"

    if [ -z "$SAFE_SCALE" ]; then
        # Original size
        out="${dir}/${name}.mp4"
        "$FFMPEG" -i "$f" \
            -vcodec libx264 -pix_fmt yuv420p -crf 23 -preset medium \
            -acodec aac -movflags +faststart \
            "$out" 2> ~/Desktop/ffmpeg_error.log
    else
        # Custom scale
        out="${dir}/${name}_$(echo "$SAFE_SCALE" | tr -d ":").mp4"
        "$FFMPEG" -i "$f" \
            -vf "scale=${SAFE_SCALE}" \
            -vcodec libx264 -pix_fmt yuv420p -crf 23 -preset medium \
            -acodec aac -movflags +faststart \
            "$out" 2> ~/Desktop/ffmpeg_error.log
    fi

    last_out="$out"
done

# Notify user when finished
"$NOTIFY" \
  -title "ffmpeg" \
  -message "Conversion completed." \
  -actions "Show" \
  -execute "open -R \"$last_out\""