You may have noticed that when you are playing a YouTube video, it buffers only so much ahead of your current position. And should you pause the video, buffering stops altogether. The reason behind this lackluster form of buffering? YouTube's embrace of Dynamic Adaptive Streaming over HTTP (Dash), which breaks a video into segments, buffering each segment as you make your way through the video. In theory, Dash allows YouTube to adapt to changing network conditions without stalling out at times.
In the real world, Dash means you can't pause a video and come back to it later … Read more