#!/bin/bash

if [ $# -ne 3 ]; then
    echo "Usage: $0 <video_file> <subtitle_file> <output_file>"
    exit 1
fi
if [ ! -f "$1" ]; then
    echo "Error: Video file '$1' not found"
    exit 1
fi
if [ ! -f "$2" ]; then
    echo "Error: Subtitle file '$2' not found"
    exit 1
fi

ext="${3##*.}"
if [ "$ext" = "mp4" ]; then
    ffmpeg -i "$1" -i "$2" -c copy -c:s mov_text "$3"
else
    ffmpeg -i "$1" -i "$2" -c copy "$3"
fi