C++ 使用 GDI/DXGI 截取屏幕，再使用 FFmpeg/x264 转为 H264 格式视频
License: GNU Lesser General Public License v2.1
Capture the screen using GDI/DXGI and then convert it to H264 format video using x264.
使用 GDI/DXGI 截取屏幕，再使用 x264 转为 H264 格式视频。
醉了。
本来想将 h264 数据再使用 x264 解码，再渲染。
在网上查资料，发现几乎没有使用 x264 解码的，都是用 FFmpeg，然后看了下 x264 的头文件，好像没有解码的接口。
然后在维基百科X264上的看到这句话：x264的主要功能在于进行H.264/MPEG-4 AVC的视频编码，而不是作为解码器（decoder）之用。
嗯..好吧，我去用 FFmpeg。
答应我 下次 咱们用cmake 好吗？
我尝试将rgba数据保存到unsigned char* ，并且让函数返回这个值。在python调用这个函数。但是每次的return都为空。
如果我只需要一张图片，但不是黑色图。DXGI的captureRGB32()是否需要循环运行两次来过滤掉无效的黑色图。
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