One thing to note is that

One thing to note is that compressors either run to a set quality level or a set bit rate. That is if you want to increase quality you will need to increase the bit rate or file size of the video. Newer technology used by Netflix has started to use the video content to drive the file size or quality level. That is the compressors become more intelligent in deciding how much compression can take place to maintain a certain quality level depending on the content of the video. http://www.iqcompress.euclidiq.com will be coming out with this ability and there are additional encoders in the industry that have started to use “content aware” methods.