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punktfunk/crates
enricobuehlerandClaude Opus 5 940bd0b7ec
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feat(core/abr): the startup capacity probe's target is configurable
The Automatic startup probe bursts at a fixed 2 Gbps two seconds into every
session, deliberately far above any plausible link so the burst measures the
link rather than itself. On links the burst DISTURBS, that backfires: on an
LG G5 (webOS 10.3), three back-to-back connects to the same Gamescope host
split two ways — the two where the probe finished in ~1-2 s had video within
2-4 s, while the one that hit the 6 s timeout showed no video for 14 s. Even
a "successful" probe on that link reported send_dropped=20211. The webOS
client already caps its own speed test at 320 Mbps because an unbounded
firehose starves a 2-3 core TV; core then bursts the same hardware at 2 Gbps.

PUNKTFUNK_ABR_PROBE_KBPS now sets that target, so an embedder that caps its
own speed test can cap ours to match. Unset, zero, or unparseable keeps the
2 Gbps default, so every existing session behaves exactly as before. The
existing opt-out (PUNKTFUNK_ABR_PROBE=0) is no substitute: it leaves the
climb ceiling pinned at the negotiated ~20 Mbps.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-07-30 14:24:57 +02:00
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