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[Non-BE] Resolve "Combined orientation external target interpolation different within frame and on frame borders"

bayersrequested to merge
809-combined-orientation-external-target-interpolation-different-within-frame-and-on-frame-borders into main

Reason why this change is needed

If the enableExternalOrientation flag changes from false to true the behaviour on a frame border (where it uses Quaternions_prev_extOrientation as start point which is identity in this case) and within a frame where it uses the previous Quaternion of the external Orientation differ in case of external orienatation target interpolation.

Description of the change

Unifiy the behaviour (i.e. also start from identity intra-frame)

Affected operating points

  • all modes with external orientation and external target interpolation
  • Produced bitstream is BE compared to previous state (no encoder changes)

Related to #809 (closed)

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