CCS/TDA2EVM5777: how to save vedio use multi_cam_

Tool/software: Code Composer Studio

i   am   use   tda2  evm  SDK_VISION_03_04_00_00\vision_sdk\apps\src\hlos\adas\src\usecases\lvds_vip_multi_cam_vpe_enc_null   to   save    4   cam  vedio,

i  donot  know   in  the  null   link   where  the  file  save ?

and    i   think     fwrite(bitstreamBuf->bufAddr, bitstreamBuf->fillLength, 1, pObj->fpDataStream[chNum]);     

here   chNum  is  camis  id?

thank 

shuai