>[!tldr] Dynamic Adaptive Streaming over HTTP (DASH) >This is a technique to implement [[Bitrate adaption|bitrate adaption]]. This has multiple implementations such as [[HTTP Live Streaming (HLS)]] or [[MPEG-DASH]]. These implementations differ in detail such as the encoding algorithms, segment sizes, DRM support, bitrate adaptation algorithms, etc. > >Here videos are cut into chunk and each chunk it encoded at different [[Bitrate|bitrates]]. Each time the some video is downloaded it calls the [[Bitrate adaption|bitrate adaption]] function $f$ to determine the [[Bitrate|bitrate]]. > >![[DASH_function.png]] > >Where $\{R_1, R_2, \ldots, R_m\}$ is the set of [[Bitrate|bitrates]].