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DM8127 can not adjust JPEG encode quality and resolution dynamically

pan fan
Prodigy 60 points
Hi, all
I met 2 problems when using JPEG encoder on DM8127, the codec I use is 500.V.MJPEG.E.IVAHD.01.00
1. can not adjust JPEG encode quality dynamically. For example when I change parameter "dynamicParams->qualityFactor" from 90 to 10, the quality of output pictures seems not change,and the size of pictures did not change also.
2. can not adjust JPEG encode resolution dynamically. For example, the first frame's resolution is 2560*2048，if I want to change the second frame's resolution to 640*480，the encode output picture of second frame is wrong。
could anyone help on this? Thank you very much :)