Java 8不等待ffmpeg进程输出缓冲区读取完成

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FfmpegProcessExample {
    public static void main(String[] args) {
        try {
            ProcessBuilder processBuilder = new ProcessBuilder("ffmpeg", "-i", "input.mp4", "output.mp4");
            Process process = processBuilder.start();

            // 异步读取输出流
            Thread outputThread = new Thread(() -> {
                try (InputStream inputStream = process.getInputStream();
                     InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                     BufferedReader bufferedReader = new BufferedReader(inputStreamReader)) {
                    String line;
                    while ((line = bufferedReader.readLine()) != null) {
                        System.out.println(line);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            outputThread.start();

            // 等待ffmpeg进程执行完成
            int exitCode = process.waitFor();
            outputThread.join();

            if (exitCode == 0) {
                System.out.println("ffmpeg process completed successfully.");
            } else {
                System.out.println("ffmpeg process failed with exit code: " + exitCode);
            }
        } catch (IOException | InterruptedException e) {
            e.printStackTrace();
        }
    }
}