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DEI fps problem

hi all ,when i use the following link

cap + dei +enc +......

i can get the correct fps for dei,the log is the following:

[m3vpss ] *** [DEI0 ] DEI Statistics ***
[m3vpss ]
[m3vpss ] Elasped Time : 20 secs
[m3vpss ] Total Fields Processed : 5073
[m3vpss ] Total Fields FPS : 126 FPS
[m3vpss ]
[m3vpss ]
[m3vpss ] CH | In Recv In Reject In Process Out[0] Out[1] Out[2] Out[3] Out[4] Skip Out[0] Skip Out[1] Skip Out[2] Skip Out[3] Skip Out[4] User Out[0] User Out[1] User Out[2] User Out[3] User Out[4] Latency
[m3vpss ] Num | FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS Skip FPS Skip FPS Skip FPS Skip FPS Skip FPS Min / Max
[m3vpss ] -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
[m3vpss ] 0 | 61 0 61 0 61 0 0 0 61 0 0 0 0 0 0 0 0 0 26 / 42
[m3vpss ] 1 | 61 0 61 0 61 0 0 0 61 0 0 0 0 0 0 0 0 0 23 / 41
[m3vpss ]
[m3vpss ]

but if i use the link like:

cap - - - -

                |- - - - >dei+enc +......                  so the log will be following:

dec- - - -

[m3vpss ] *** [DEI0 ] DEI Statistics ***
[m3vpss ]
[m3vpss ] Elasped Time : 20 secs
[m3vpss ] Total Fields Processed : 5601
[m3vpss ] Total Fields FPS : 130 FPS
[m3vpss ]
[m3vpss ]
[m3vpss ] CH | In Recv In Reject In Process Out[0] Out[1] Out[2] Out[3] Out[4] Skip Out[0] Skip Out[1] Skip Out[2] Skip Out[3] Skip Out[4] User Out[0] User Out[1] User Out[2] User Out[3] User Out[4] Latency
[m3vpss ] Num | FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS FPS Skip FPS Skip FPS Skip FPS Skip FPS Skip FPS Min / Max
[m3vpss ] -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
[m3vpss ] 0 | 46 0 46 0 46 0 0 0 46 0 0 0 0 0 0 0 0 0 153 / 267
[m3vpss ] 1 | 46 0 46 0 46 0 0 0 46 0 0 0 0 0 0 0 0 0 141 / 264
[m3vpss ] 2 | 40 0 40 0 40 0 0 0 40 0 0 0 0 0 0 0 0 0 164 / 240

so the fps dei link received is reduced ,so why?