How adaptive streaming avoids buffering

Why does a video keep playing when your Wi‑Fi stutters? Adaptive bitrate streaming swaps quality in real time so playback can stay smooth instead of freezing.^[1][3]

The stream is encoded into multiple renditions at different bitrates, then split into short chunks, typically 2–10 seconds long.^[1][3]

At each chunk boundary, the player checks bandwidth and buffer health, then switches up or down depending on what the connection can sustain.^[1][3]

Playback usually starts at the lowest bitrate so the buffer can fill quickly, which helps start times, but the first moments may look softer.^[1][3]

If bandwidth drops, the player can downshift to a lower quality to avoid stalls; if the buffer runs dry, you get rebuffering instead.^[1][4]