How could I increase new decode channels of 2048x1536 resolution?

Hi all,

     I am using RDK 3.5.

      I have initialized 16 decode channels of 1080P at decLink create time ,and I delete all decode channels by Vdec_deleteChn() . Then I used Vdec_createChn() to create 3 decode channels of 2048x1536 resolutin dynamically,  at last I delete 3 decode channels and create other 3 channels.but It could only decode and display 2 channels, why?

Thanks!

Best regards!