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Windowed pose extraction: t0/duration parameters for extract_pose_landmarks #354

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@alexarje

The Westney study's excerpt extractors could not be migrated to _posetools.extract_pose_landmarks because it lacks start-time/duration windowing (extracting landmarks for a sub-segment of a long video without decoding the whole file). Add t0/duration (or start/end) parameters wired into the ffmpeg decode (-ss/-to before -i), mirroring how other MGT functions window video.

Provenance: 2-Westney-comparisons migration (2026-07); 2 of 28 scripts unmigratable for this reason.

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