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DM8167 HDVICP capability Question!

Hello:

my platform: DVRRDK 350

my soc config:

HDVICP clk     : 600MHz
L3 Fast clk    : 549MHz
HDVPSS clk     : 274MHz
Ducati M3 clk  : 274MHz
DSP clk        : 1000MHz
ARM clk        : 1200MHz
DDR clk        : 675MHz

I have test one HDVICP endoder and decoder capabilty,about 16 channel 4CIF encoder or 10 channel 720P25 decoder

but when use 3 HDVICP to do :16 channel 4CIF encoder and 16 channel 720P25 decoder, decoder only about 18fps output

my total mem is 1G, linux use 256M,the rest for BIOS6

which reason may lead this issue,please give me some advice to improve it

thanks very much!