ffmpeg和SDL指南2
sdl和视频 为了在屏幕上显示媒体图像，我们将使用SDL。SDL是Simple Direct Layer的简称，是一个优秀的多媒体库，适用于交叉编译平台，已经被用于多个项目中。你可以从它的官方网站下载源代码或者可能的话直接下载开发包到你的操作系统中。对于该指南，你需要
sdl和视频
为了在屏幕上显示媒体图像，我们将使用SDL。SDL是Simple Direct Layer的简称，是一个优秀的多媒体库，适用于交叉编译平台，已经被用于多个项目中。你可以从它的官方网站下载源代码或者可能的话直接下载开发包到你的操作系统中。对于该指南，你需要编译SDL库（剩下的几个指南也一样）。
SDL有许多在屏幕上绘制图形的方法，而且它有一个特殊的方法用来在屏幕上显示电影--它叫做YUV层。YUV（技术上讲不叫YUV而叫YCbCr）是一种存储像RGB形式的原始图像数据的方法。粗略的将，Y是亮度分量，U和V是色度分量。（YUV比RGB更复杂，因为它删除了某些色度信息，而且每两个Y可以共用一个U和V。）SDL的YUV层使用原始的YUV数据并在屏幕上显示他们。
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