使用最新版MonteMedia ScreenRecorder在Java录屏报错，求解决方案

问题核心原因 #

1. 输出路径错误：必须指定具体带后缀的文件路径，而非目录
2. 旧版格式配置与新版库不兼容，编码参数或格式构造逻辑需要调整
3. 测试代码存在语法错误（Thread.sleep后缺分号）

修复步骤及代码 #

1. 修正录屏工具类代码

调整格式参数适配新版库，确保文件路径指向具体文件：

import org.monte.media.math.Rational;
import org.monte.media.screenrecorder.ScreenRecorder;
import org.monte.media.av.Format;
import org.monte.media.av.FormatKeys;
import org.monte.media.av.FormatKeys.MediaType;
import static org.monte.media.av.codec.video.VideoFormatKeys.*;

import java.awt.*;
import java.io.File;
import java.io.IOException;

public class Screencorder {

    private Screencorder() {}

    public static ScreenRecorder startRecording(String filePath) throws IOException, AWTException {
        GraphicsConfiguration gc = GraphicsEnvironment
                .getLocalGraphicsEnvironment()
                .getDefaultScreenDevice()
                .getDefaultConfiguration();

        // 适配新版的AVI文件格式定义
        Format fileFormat = new Format(FormatKeys.MediaTypeKey, MediaType.FILE, FormatKeys.MimeTypeKey, MIME_AVI);
        
        // 使用兼容的无压缩RGB编码，避免编码器兼容性问题
        Format screenFormat = new Format(FormatKeys.MediaTypeKey, MediaType.VIDEO,
                EncodingKey, ENCODING_AVI_UNCOMPRESSED_RGB,
                DepthKey, 24,
                FrameRateKey, Rational.valueOf(15),
                QualityKey, 1.0f);
        
        // 鼠标录制格式保持不变
        Format mouseFormat = new Format(FormatKeys.MediaTypeKey, MediaType.VIDEO,
                EncodingKey, ScreenRecorder.ENCODING_BLACK_CURSOR,
                FrameRateKey, Rational.valueOf(30));

        // 传入具体文件路径而非目录
        ScreenRecorder screenRecorder = new ScreenRecorder(gc, null,
                fileFormat, screenFormat, mouseFormat,
                null, new File(filePath));

        screenRecorder.start();
        return screenRecorder;
    }

    public static void stopRecording(ScreenRecorder screenRecorder) throws IOException {
        screenRecorder.stop();
    }
}

2. 修正测试代码

指定具体输出文件，补全语法错误：

import org.junit.jupiter.api.Test;
import org.monte.media.screenrecorder.ScreenRecorder;

class ScreenRecordingTest {

    @Test
    void recordingTest() throws Exception {
        // 必须指定带.avi后缀的具体文件路径
        ScreenRecorder recorder = Screencorder.startRecording("/tmp/recording.avi");

        Thread.sleep(2000); // 补充分号

        Screencorder.stopRecording(recorder);
    }
}

可选优化 #

如果需要压缩的AVI文件，可替换屏幕录制编码为MJPEG：

Format screenFormat = new Format(FormatKeys.MediaTypeKey, MediaType.VIDEO,
        EncodingKey, ENCODING_AVI_MJPEG,
        FrameRateKey, Rational.valueOf(15),
        QualityKey, 0.8f);

内容的提问来源于stack exchange，提问作者Anna