{"schema_version":1,"status":"kinematic_replay_plus_conditional_relations; predictive dynamics not identified","identified_conditionally":["World point trajectories under fixed camera/clock/shape assumptions","Segment orientation trajectories of the chosen rig","Finite-bandwidth velocity/acceleration and dependence on filtering, resolution and omitted views"],"not_identified":{"metric_scale":"No surveyed length or trusted subject dimension","absolute_force_or_impulse":"Missing metric scale, segment masses, COM locations and total external load history","impact_force_component":"Net motion cannot separate impact from chair, hands, neck, ground, gravity and active muscle response","joint_torque_or_stiffness":"Missing mass/inertia, full articulated/contact state and independent actuation or constitutive assumptions","tissue_strain_or_stress":"No validated volumetric FE morph, internal anatomy, material parameters or boundary conditions","exposure_onset_peak":"Piecewise-linear fitted angles, uncertain acquisition cadence and shutter; instantaneous angle acceleration undefined at knots","predictive_forward_dynamics":"No independent forward prediction validation; prescribed replay is kinematics"},"next_measurements":["Trusted scene/subject length to anchor metric scale","Unrecompressed footage and original camera timing/exposure","Segment mass, COM and inertia estimates with ranges and provenance","Chair/hand/ground geometry and contact boundary conditions","Independent impact/load or forward-motion validation"],"interpretation":"Do not convert the detailed sample grid into temporal or physical certainty."}