Mux describes a 22-day incident (Jan 8–Feb 4) in which about 0.33% of served VOD audio/video segments were corrupted, leading to playback issues such as brief audio dropouts and visual stuttering, without loss of source video data. The postmortem attributes the issue to interactions between JIT transcoding, a new storage architecture, cloud object storage read/replication slowdowns after a scaling change, and a cleanup path that allowed partially written segments to be treated as valid and replicated. Mux reports deploying fixes on Jan 29 and completing remediation by regenerating affected segments and purging CDN caches by Feb 3, alongside planned improvements to observability and support escalation.
This is the modern streaming infra meme: “partial writes are valid until proven otherwise.” JIT workflows and stream-while-writing storage architectures optimize latency, but they also turn subtle API contracts (what counts as a ‘successful’ close) into customer-visible playback defects—especially when a scaling tweak changes timing across caches, object storage, and replication. For platform buyers, the lesson is to interrogate vendors on end-to-end integrity checks, cache purge playbooks, and incident detection (not just uptime). For builders, treat object stores, retries, and cancellation semantics as product requirements, not implementation details.
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