# macOS (Homebrew)
brew install ffmpeg

# Ubuntu
sudo apt-get install ffmpeg

ffmpeg -version

package com.example.ffmpeg.util;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class FFmpegUtil {

    /**
     * 執(zhí)行 FFmpeg 命令
     *
     * @param command FFmpeg 命令字符串
     * @throws Exception
     */
    public static void executeCommand(String command) throws Exception {
        ProcessBuilder builder = new ProcessBuilder(command.split(" "));
        builder.redirectErrorStream(true);
        Process process = builder.start();

        // 輸出日志
        try (BufferedReader reader = new BufferedReader(
                new InputStreamReader(process.getInputStream()))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println("[FFmpeg] " + line);
            }
        }

        int exitCode = process.waitFor();
        if (exitCode != 0) {
            throw new RuntimeException("FFmpeg 執(zhí)行失敗，退出碼：" + exitCode);
        }
    }
}

String cmd =  "ffmpeg -i input.mp4 output.avi";
FFmpegUtil.executeCommand(cmd);

String cmd = "ffmpeg -i input.mp4 -ss 00:00:05 -vframes 1 output.jpg";
FFmpegUtil.executeCommand(cmd);

String cmd = "ffmpeg -i input.mp4 -q:a 0 -map a output.mp3";
FFmpegUtil.executeCommand(cmd);

package com.example.ffmpeg.controller;

import com.example.ffmpeg.util.FFmpegUtil;
import org.springframework.web.bind.annotation .*;

@RestController
@RequestMapping("/ffmpeg")
public class FFmpegController {

    @GetMapping("/screenshot")
    public String screenshot(@RequestParam String input, @RequestParam String output) {
        try {
            String cmd = String.format("ffmpeg -i %s -ss 00:00:02 -vframes 1 %s", input, output);
            FFmpegUtil.executeCommand(cmd);
            return "截圖成功，輸出文件：" + output;
        } catch (Exception e) {
            return "截圖失?。? + e.getMessage();
        }
    }
}