FA-11119 / Streaming segment lifecycle / Member archive

Discontinuity base increments on prune · case 04

A sliding manifest window loses discontinuity history when old segments disappear.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

Each segment marks whether a discontinuity precedes it. When pruning sequences below keep_from, advance the retained-window discontinuity base by only pruned markers.

Why this case matters

A deterministic local media controller stage; metadata and downloaded data are supplied explicitly. No external player, service or codec is required.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fixture 1	`3`	`4`	Failed

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