基于Java和FFmpeg实现视频压缩和剪辑功能

<dependencies>
    <!-- 处理 JSON 的依赖 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.83</version>
    </dependency>

    <!-- 文件处理工具 -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.11.0</version>
    </dependency>
</dependencies>

ffmpeg -version

import com.alibaba.fastjson.JSONObject;
import org.springframework.transaction.annotation.Transactional;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.List;

public class VideoService {

    @Transactional
    public void compress(JSONObject param) {
        String title = param.getString("title");
        String inputPath = param.getString("inputPath");
        String outputPath = param.getString("outputPath");

        try {
            File inputFile = new File(inputPath);
            if (!inputFile.exists() || !inputFile.isFile()) {
                throw new RuntimeException("文件不存在");
            }

            // 假设压缩到 1M 码率（1000k）
            int targetBitrate = 1000;

            List<String> cmdList = Arrays.asList(
                "ffmpeg", "-i", inputPath,
                "-c:v", "libx264", "-b:v", targetBitrate + "k",
                "-movflags", "+faststart", outputPath
            );

            System.out.println("执行命令: " + String.join(" ", cmdList));
            Process process = new ProcessBuilder(cmdList).inheritIO().start();
            process.waitFor();
        } catch (Exception e) {
            throw new RuntimeException("压缩失败: " + e.getMessage());
        }
    }
}

import java.util.ArrayList;
import java.util.List;

public class VideoService {

    @Transactional
    public void videoClip(JSONObject param) {
        String inputPath = param.getString("inputPath");
        String outputPath = param.getString("outputPath");
        String startTime = param.getString("startTime");
        String endTime = param.getString("endTime");

        try {
            List<String> cmdList = new ArrayList<>();
            cmdList.add("ffmpeg");
            cmdList.add("-i");
            cmdList.add(inputPath);
            cmdList.add("-ss");
            cmdList.add(startTime);
            cmdList.add("-to");
            cmdList.add(endTime);
            cmdList.add("-c:v");
            cmdList.add("copy"); // 保持视频流不变
            cmdList.add("-c:a");
            cmdList.add("aac"); // 音频使用 AAC 编码
            cmdList.add("-movflags");
            cmdList.add("+faststart"); // 优化播放体验
            cmdList.add(outputPath);

            System.out.println("执行命令: " + String.join(" ", cmdList));
            Process process = new ProcessBuilder(cmdList).inheritIO().start();
            process.waitFor();
        } catch (Exception e) {
            throw new RuntimeException("剪辑失败: " + e.getMessage());
        }
    }
}