Extract the first frame from an mp4 with ffmpeg (ChatGPT wrote this for me)

extract-first-frame.sh

#!/bin/bash

# Check if an input file is provided
if [[ -z "$1" ]]; then
  echo "Usage: extract-first-frame.sh input.mp4 [output.jpg] [frame_number]"
  exit 1
fi

# Set the input file name
input_file="$1"

# Set the output file name
if [[ -z "$2" ]]; then
  output_file="output.jpg"
else
  output_file="$2"
fi

# Set the frame number
if [[ -z "$3" ]]; then
  frame_number=1
else
  frame_number="$3"
fi

# Run the ffmpeg command
ffmpeg -i "$input_file" -vf "select=eq(n\,$frame_number)" -vframes 1 -q:v 2 "$output_file"

# Print a success message
echo "Frame number $frame_number of $input_file has been extracted as $output_file"