I’m receiving an error in Automator “The action “Run Shell Script” encountered an error:”

My script works perfectly fine when running it in terminal and gives the exact outputs I need – the script selects the video in the folder: “yourvideo.mp4” and then extracts an image every 60 seconds (Theres also a variable script where I can specify the seconds if needed)

But when I run it through automator: “The action “Run Shell Script” encountered an error”

#!/bin/bash

# Input and output directories
INPUT_DIR="/Users/river/Content/FFMPEG/FFMPEG IN"
OUTPUT_DIR="/Users/river/Content/FFMPEG/FFMPEG Out"

# Default interval (seconds per image)
DEFAULT_INTERVAL=60

# Function to display usage information
usage() {
    echo "Usage: $0 -v video_name [-i interval]"
    echo "  -v video_name   Name of the video file in the input directory to process"
    echo "  -i interval     Interval in seconds between each thumbnail (default is $DEFAULT_INTERVAL seconds)"
    exit 1
}

# Parse command-line arguments
while getopts ":v:i:" opt; do
  case $opt in
    v) VIDEO_NAME="$OPTARG"
    ;;
    i) INTERVAL="$OPTARG"
    ;;
    *) usage
    ;;
  esac
done

# Ensure the video name is provided
if [ -z "$VIDEO_NAME" ]; then
    usage
fi

# Set interval to default if not specified
if [ -z "$INTERVAL" ]; then
    INTERVAL=$DEFAULT_INTERVAL
fi

# Check if the specified video exists in the input directory
VIDEO_PATH="$INPUT_DIR/$VIDEO_NAME"
if [ ! -f "$VIDEO_PATH" ]; then
    echo "Error: Video file '$VIDEO_NAME' not found in the input directory."
    exit 1
fi

# Create output directory if it doesn't exist
mkdir -p "$OUTPUT_DIR"

# Get the base name of the video file (without extension)
BASE_NAME=$(basename "$VIDEO_PATH" | sed 's/.[^.]*$//')

# Create a subdirectory in the output directory with the video file's name
VIDEO_OUTPUT_DIR="$OUTPUT_DIR/$BASE_NAME"
mkdir -p "$VIDEO_OUTPUT_DIR"

# Generate thumbnails at the specified interval and save them as .png
ffmpeg -i "$VIDEO_PATH" -vf "fps=1/$INTERVAL,scale=iw:ih" "$VIDEO_OUTPUT_DIR/thumb%04d.png"

echo "Thumbnails for '$VIDEO_NAME' have been saved to '$VIDEO_OUTPUT_DIR'"
echo "Thumbnail generation complete."

I have checked the directories & file names are correct. I am very new to using Automator, so I dont know if I’m missing something completely…

Automator has full file access too.

Any help would be appreciated.