What is Buffering? Why Live Streams Stall & How to Stop It

Buffering is the process by which a video player downloads and stores media ahead of the current playback position to absorb short-term network variability, while rebuffering occurs when that stored media runs out and playback pauses. Live streams are more susceptible to stalls than video on demand because players cannot buffer beyond the newest available segment, creating a trade-off between low latency near the live edge and a larger safety cushion. Common causes include insufficient viewer bandwidth, bitrate peaks above declared levels, oversized or improperly keyed segments, delayed playlist updates, and player settings that start too close to the live edge, with many issues originating in the encoding, packaging, or delivery pipeline. Recommended mitigations include providing an adaptive bitrate ladder with low-quality options, controlling encoder bitrate peaks, aligning keyframes with segment boundaries, using a CDN, and increasing live hold-back or buffer settings when startup stalls are frequent. Rebuffering can be tracked through browser playback events and metrics such as rebuffer ratio and startup time, allowing teams to establish baselines and assess whether configuration or infrastructure changes improve viewer experience.

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