JavaCV分享

JavaCV是什么

JavaCV 是一款开源的视觉处理库，基于GPLv2协议，对各种常用计算机视觉库封装后的一组jar包，封装了OpenCV、ffmpeg、videoInput…等计算机视觉编程人员常用库的接口。

maven引用

<properties>
    <javacpp.version>1.4.2</javacpp.version>
    <!-- 这里要根据自己的平台选择不同的依赖 -->
    <!--<javacpp.platform.dependencies>linux-x86_64</javacpp.platform.dependencies>-->
    <javacpp.platform.dependencies>macosx-x86_64</javacpp.platform.dependencies>
</properties>
<dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv</artifactId>
            <version>${javacpp.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.bytedeco.javacpp-presets</groupId>
                    <artifactId>*</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>opencv</artifactId>
            <version>3.4.2-${javacpp.version}</version>
        </dependency>
        <dependency>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>ffmpeg</artifactId>
            <version>4.0.1-${javacpp.version}</version>
        </dependency>
        <dependency>
            <groupId>org.bytedeco.javacpp-presets</groupId>
            <artifactId>ffmpeg</artifactId>
            <version>4.0.1-${javacpp.version}</version>
            <classifier>${javacpp.platform.dependencies}</classifier>
        </dependency>
    </dependencies>

提取视频中的图片

/**
 * 从视频中将每一帧的图片提取出来
 *
 * @param video
 * @return
 * @throws FrameGrabber.Exception
 */
public static List<BufferedImage> grab(File video) throws Exception {
    try (FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(video.getPath())) {
        grabber.start();

        List<BufferedImage> images = Lists.newArrayList();
        Frame frame;
        while ((frame = grabber.grabImage()) != null) {
            images.add(Java2DFrameUtils.toBufferedImage(frame));
        }
        return images;
    }
}

图片合成视频

private static class VideoRecorder implements Closeable {
        private FFmpegFrameRecorder recorder;

        public VideoRecorder(String output, int width, int height) throws FrameRecorder.Exception {
            recorder = new FFmpegFrameRecorder(output, width, height);
            recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);
            recorder.setFormat("mp4");
            recorder.setFrameRate(FPS);
            recorder.setAudioBitrate(192000);
            recorder.setSampleRate(44100);
            recorder.setAudioChannels(2);
            recorder.start();
        }

        public void addFrame(BufferedImage image) throws FrameRecorder.Exception {
            Frame frame = Java2DFrameUtils.toFrame(image);
            recorder.record(frame, avutil.AV_PIX_FMT_ARGB);
        }

        public void addAudio(File audioFile) throws FrameGrabber.Exception, FrameRecorder.Exception {
            if (audioFile == null || !audioFile.exists()) {
                return;
            }
            try (FFmpegFrameGrabber grabber = FFmpegFrameGrabber.createDefault(audioFile)) {
                grabber.start();
                Frame frame;
                while ((frame = grabber.grabSamples()) != null) {
                    recorder.recordSamples(frame.sampleRate, frame.audioChannels, frame.samples);
                }
            }
        }

        @Override
        public void close() throws IOException {
            recorder.close();
        }
    }