图像处理领域涉及很多有趣的算法，运动的图像就是视频！
FPS，Frame Per Second，即frame rate；HFR，High Frame Rate。
CBR，target for Constant Bit Rate；VBR，Variable Bit Rate, target for Constant Visual Quality。Visual Quality包括流畅度和画面质量。x264的CRF，Constant Rate Factor，就是Quality-based VBR，可在不重新初始化的情况下直接修改，立即生效。In the early days, engineers came up with a technique for doubling the perceived frame rate of a video display without consuming extra bandwidth. This technique is known as
interlacedvideo; it basically sends half of the screen in 1 "frame" and the other half in the next "frame". Today screens render mostly usingprogressivescan technique. Progressive is a way of displaying, storing, or transmitting moving images in which all the lines of each frame are drawn in sequence. （interlaced技术已经基本被淘汰了）One common mistake that beginners often do is to confuse digital video
CODECand digital videocontainer. We can think of containers as a wrapper format which contains metadata of the video (and possible audio too), and the compressed video can be seen as its payload. Usually, the extension of a video file defines its video container. For instance, the file video.mp4 is probably a MPEG-4 Part 14 container and a file named video.mkv it's probably a matroska. （根据smally项目的经验，使用file或ffmpeg来判断container应该更好）alpha通道的值，在图像融合计算时，表示权重，0-255映射为0-1，视觉效果就是透明度。
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