CONCEPT Cited by 1 source
Seamless signal switching¶
Seamless signal switching is viewer-imperceptible failover between hot-standby redundant broadcast streams. Gaps on one contribution leg are concealed by another leg at the packet layer, so the viewer never sees a stutter, frame drop, or reconnect.
Distinct from generic failover¶
Generic failover (cold-standby → health check → promote) has observable latency — at minimum a frame drop, often a stutter or reconnect. Seamless switching is designed to be undetectable:
- Both legs flow continuously (hot-standby, no promotion latency)
- Packet-layer merging at the receiver rather than frame-layer selection
- Sub-frame failover granularity — losses on one leg are filled by the other within the same frame
This is distinct from graceful degradation, which explicitly allows a reduced-quality but observable mode. Seamless means the viewer notices nothing.
Canonical instance — SMPTE 2022-7¶
The broadcast-industry standard for seamless IP video switching is SMPTE 2022-7. Two identical streams are sent over physically independent paths; the receiver reassembles a single output by consuming packets from whichever leg delivered them first.
Why it matters for live¶
Live broadcast has "no ability to pause or roll back" (per Netflix's 2026-04-17 Human Infrastructure post). Any observable failover is a viewer-visible defect. The combination of triple-redundant contribution at the venue + seamless switching at the BOC is how Netflix Live guarantees reliability under leg failures without using observable-failover mechanisms.
Seen in¶
- 2026-04-17 — sources/2026-04-17-netflix-the-human-infrastructure-live-operations — Netflix names SMPTE 2022-7 as the seamless-switching technology inside the BOC's highly redundant IP video architecture.