增强现实：在标记之上渲染视频
我想在标记上渲染视频（可以是任何格式，只要它有效），但我不知道如何做到这一点。我使用 Artoolkit 进行桌面 AR，使用 QCAR 进行移动 AR。最终我想在两个系统上完成它，因此我最好寻找一个可以在两个平台上使用的视频库。
基本上我知道必须完成的步骤：
- load video file
- extract image according to current time
- use image as texture
- apply marker's transformation matrix to textured rectangle
我可以使用哪些库来实现前两个步骤？
I'd like to render a video (can be any format as long as it works) on top of a marker, but I am not sure how to do this. I am using Artoolkit for desktop-based AR and QCAR for mobile AR. Eventually I want to get it done for both systems, therefore I am preferably looking for a video-library that I could use on both platforms.
Basically I know the steps that have to be done:
- load video file
- extract image according to current time
- use image as texture
- apply marker's transformation matrix to textured rectangle
Which libraries could I use to achieve the first two steps?
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查看 libavcodec 库（您可以此处启动），但要考虑到它相当复杂。
Take a look into the libavcodec library (you can start here), but take into account that it is quite complex.