using paranomic capture to make 360 movie

Hi guys,
I have some questions about using paranomic capture to output png sequences.
I saw this article about 360 movie
https://www.unrealengine.com/en-US/tech-blog/capturing-stereoscopic-360-screenshots-videos-movies-unreal-engine-4

but my png output sequence result is to quick
like i set camera key frame f0(z,postition=1500) to f120 (z,postition=100),
but output to C:\PanoramicCaptureFrames , frame 0 to 15 png , camera is moving ,but f16 to f120 is stop,
it’s mean panoramic capture render camera z,postition=1500 to z,postition=100 just cost 14 png @@@@
WHY!!!
than i open the BP Capture blueprint ,and try to change any i could change , but it still go wrong…
so i open panoramic’s Scene Capturer .cpp in
C:\Program Files\Epic Games\UE_4.24\Engine\Plugins\Experimental\PanoramicCapture\Source\PanoramicCapture\Private
Try to type the code : -usefixedtimestep -fps = 24 -notexturestreaming
but it’s not working .
Need some help , please !!!><