The script to split an image horizontally into equal parts with ffmpeg

split_horizontal_concat_image.sh

#!/bin/bash

input_file="$1"
N="$2"
output_dir="${3:-.}"

# Get image width
width=$(ffprobe -v error -select_streams v:0 -show_entries stream=width -of csv=p=0 "$input_file")

# Calculate width of each segment
segment_width=$((width / N))

# Get base name of input file without extension
base_name=$(basename "$input_file")
base_name="${base_name%.*}"

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

# Split and save segments
for ((i = 0; i < N; i++)); do
    start_position=$((i * segment_width))
    output_file="${output_dir}/${base_name}_$((i + 1)).jpg"
    ffmpeg -i "$input_file" -vf "crop=${segment_width}:ih:${start_position}:0" -q:v 1 "$output_file"
done