#!/bin/bash

# Input video file
input_file="input_video.mp4"

# Output video file
output_file="output_video.mp4"

# Target aspect ratio (e.g., 9:16)
target_aspect_ratio="9:16"

# Get the dimensions of the input video
video_info=$(ffprobe -v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 "$input_file")
width=$(echo "$video_info" | cut -d ',' -f 1)
height=$(echo "$video_info" | cut -d ',' -f 2)

# Calculate the target width based on the target aspect ratio and height
IFS=':' read -ra target_ratio <<< "$target_aspect_ratio"
target_height=$((height))
target_width=$((height * target_ratio[0] / target_ratio[1]))

# Make sure the dimensions are even
if [ $((target_width % 2)) -ne 0 ]; then
  target_width=$((target_width + 1))
fi
if [ $((target_height % 2)) -ne 0 ]; then
  target_height=$((target_height + 1))
fi

# Calculate the cropping parameters to center the video
crop_x=$(( (width - target_width) / 2 ))
crop_y=0  # Center vertically

# Use FFmpeg to crop and resize the video
./ffmpeg -i "$input_file" -vf "crop=$target_width:$target_height:$crop_x:$crop_y" -c:a copy -s "${target_width}x${target_height}" -y "$output_file"

echo "Video cropped, resized, and saved as $output_file"