I tried
At-Large Recorder 2 and the quality of the recording was much lower than the live stream in Slingcast (more pixelated).
I then tried Windows Media and Camtasia but got a black screen unless I turned off VBR from within Slingplayer. Then is does work, but turning of VBR definitely makes it look lower quality. Is there anyway to record a Slingplayer stream that appears as good quality as through Slingplayer itself?
Alternatively, is there any way to process the file recorded with VBR turned off so that the pixelation is 'smoothed-out' and the effect of having VBR on is recreated?