ffmpeg水印没有vhook？ [英] ffmpeg watermark without vhook?

问题描述

由于vhook子系统已从最新版本的FFMPEG中删除，我如何向视频添加水印？

Since the vhook subsystem has been removed from the latest version of FFMPEG, how can I add a watermark to a video?

我需要覆盖一个PNG具有背景透明度。

I need to be able to overlay a PNG with background transparency.

推荐答案

使用Xuggler，我们可以在java中执行此操作。
在使用IMediaTool编码视频时，您将获得图像序列。使用这些图像在这些图像中的每一个上放置水印，并生成输出视频。以下是代码块

Using Xuggler we can do this in java. while encoding the video using IMediaTool, you will be getting sequence of images. Using these images place water mark on each of these images and generate a output video. Following is the code block

BufferedImage imageB = event.getImage();

/*....................... water mark .........................*/
Graphics2D g2d = (Graphics2D) imageB.getGraphics();
g2d.drawImage(imageB, 0, 0, null);

//Create an alpha composite of 50%
AlphaComposite alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1.0f);
g2d.setComposite(alpha); 

g2d.setColor(Color.YELLOW);


g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

g2d.setFont(new Font("Arial", Font.BOLD, 30));

String watermark = "Sample water mark";

FontMetrics fontMetrics = g2d.getFontMetrics();
Rectangle2D rect = fontMetrics.getStringBounds(watermark, g2d);
yScrolling = imageB.getHeight() - (int) rect.getHeight() / 2;

g2d.drawString(watermark, (imageB.getWidth() - (int) rect.getWidth()) / 2,
                         (imageB.getHeight() - (int) rect.getHeight()) / 2);
g2d.drawString(watermark, xScrolling,yScrolling);

//Free graphic resources
g2d.dispose(); 

 /*....................... water mark .........................*/

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