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Bandwidth fluctuates. ABR picks the highest rendition that fits — strategies differ.
What you're seeing
Throughput-based ABR: pick highest bitrate ≤ recent throughput × safety factor. Reactive; jittery.
Buffer-based ABR: pick by buffer occupancy. High buffer → safe to try higher quality. Low → conservative. Smoother; sometimes underutilizes bandwidth.
★ KEY TAKEAWAY
ABR picks rendition by bandwidth (jittery) or buffer depth (smoother). Hybrids combine both.
▶ WHAT TO TRY
- Switch strategies and watch rendition changes vs bandwidth.
- Throughput-based reacts fast; buffer-based is steadier.