Problem in CVideoRecorderUtility

Hi to All,

I m working on CVideoRecorderUtility i want to change audio and video bit rate.
for this i used...
iUtility->SetAudioBitRateL(9200);
iUtility->SetVideoBitRateL(55000);
But after doing this my application does not call Record function after this and on some value application get crashes
i m applying this function in MvruoPrepareComplete() function.
And please tell me that can we reduce the recorded file size without changing in clip time, does reduction of bit and frame rate reduce the file size.

please tell me what should i do ??

Thanks