How to set bit rate when output video using sequence or matinee?

I make a demo to output video,but the output file is too big to me. I check the file and found that the bit rate is 455466kbps,it’s too big!,how to set it when output video?

I don’t believe you can on video output. The best method is to use a image output, so you get a sequence of images, which you can put together in a video editor or ffmpeg etc. External editors will give you far more control than the uncompressed avi that unreals video output provides.