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How to change encoder's base pts-dts shift?

OTorg
New Contributor III
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Consider a scenario when need to join (at idr points) two h264-encoded segments (produced by different codecs). There should be no gap by pts nor by dts at the junction point.
imsdk h264 encoder always produce first encoded frame's dts = minimal_input_pts - 80ms (-2 frames at 25 fps rate), except low-delay I/P-only configurations with zero shift.
Is there a way to instruct encoder to make base shift (on idr frame) equal to -1 or -3 frames, e.g.? I tried to play with the different encoder settings (GopRefDist, NumRefFrame, InitialDelayInKB, etc), but always got -2 frames delta...

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