levelc-java和c/c++交互

github

源码地址是传送门。

音视频

VideoExtractFrames 提取视频的指定位置的帧

void testVideoExtractFrames() {
    def files = io.vavr.collection.List.ofAll(VideoExtractFrames.videoExtractFrames("D:\\big.mp4", [333, 666, 999]))
            .zipWithIndex()
            .map(new Function<Tuple2<Frame, Integer>, String>() {
                @Override
                String apply(Tuple2<Frame, Integer> tuple2) {
                    String file = "D:\\pet" + tuple2._2 + ".jpg"
                    ImageIO.write(EnhanceFrameUtils.toBufferedImage(tuple2._1), "jpg", new File(file))
                    return file
                }
            }).asJava()
    ShowImage.showImage(files as String[])
}

提取333/666/999帧，效果如下：

VideoFrameList 随机或均匀提取视频中的n张图片

void testVideoFrameList() {
    def files = io.vavr.collection.List.ofAll(VideoFrameList.videoFrameList("D:\\big.mp4", 3, false))
            .map(new Function<Rule<Integer, Frame>, String>() {
                @Override
                String apply(Rule<Integer, Frame> rule) {
                    String file = "D:\\big" + rule.getKey() + ".jpg"
                    ImageIO.write(EnhanceFrameUtils.toBufferedImage(rule.value), "jpg", new File(file))
                    return file
                }
            }).asJava()
    ShowImage.showImage(files as String[])
}

上面代码随机在视频中选了3帧，显示如下：