question: perform any pre-processing of the source bitstream before the actual filtering takes place in mediafiltermanager.processbitstream . return true if pre-processing is successful or no pre-processing is necessary . return false if bitstream should be skipped for any reason . concode_field_sep PlaceHolder placeHolder concode_field_sep void postProcessBitstream
target: boolean function ( Context arg0 , Item arg1 , Bitstream arg2 , boolean arg3 ) { return true ; }