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4grayandClaude Fable 5.1
ae85428065
Arrow keys and the ±10 s buttons in the Embedded MPV player advanced only about a second per press when pressed repeatedly or held. The shortcuts already asked for 5 s steps, but `EmbeddedMpvCommandRunner.seekBy` turned each step into an absolute `seek` computed from `session.positionSeconds`, which is floored to whole seconds, polled every 500 ms (helper snapshots at most every 250 ms) and not refreshed by the seek reply. Every press inside that window therefore landed on the same target. Steps now go through a new `EMBEDDED_MPV_SEEK_BY` IPC / `seekEmbeddedMpvBy` bridge method that every backend forwards as mpv `seek <delta> relative+exact`: `seekBy` exports in the macOS addon and the Windows/Linux `wid` addon (Linux over its JSON IPC socket), and a `seek-by` stdin command in the frame-copy helper. mpv resolves the delta against its own position and merges queued relative seeks, so presses accumulate as in mpv itself. The absolute form survives only as a fallback for a preload without the method or an addon binary without `seekBy`; the timeline scrub still commits an absolute target. Validated with a real mpv 0.39 IPC probe: three relative seeks in a burst advance +15 s, three absolute seeks from one stale base advance +5 s. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>