若要将PowerPoint演示文稿转换为具有形状动画和幻灯片过渡的视频，可以使用Aspose.Slides for Java。此库允许为整个动画生成一组具有特定每秒帧（FPS）的帧。然后，这些帧可以通过FFmpeg等工具用于创建视频。

final int FPS = 30;
Presentation presentation = new Presentation("animated.pptx");
try {
    PresentationAnimationsGenerator animationsGenerator = new PresentationAnimationsGenerator(presentation);
    try {
        PresentationPlayer player = new PresentationPlayer(animationsGenerator, FPS);
        try {
            player.setFrameTick((sender, args) ->
            {
                try {
                    ImageIO.write(args.getFrame(), "PNG", new File("frame_" + sender.getFrameIndex() + ".png"));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            });
            animationsGenerator.run(presentation.getSlides());
        } finally {
            if (player != null) player.dispose();
        }
    } finally {
        if (animationsGenerator != null) animationsGenerator.dispose();
    }
} finally {
    if (presentation != null) presentation.dispose();
}

你可以找到更多的细节here。