Important to note that "HD" streams are only available thru:
Code:
http://www.cbs.com/hd/
Taking the first HD video of
the Survivor show (see screenshot):
Code:
http://www.cbs.com/hd/video.php?cid=&pid=oehXVhIQUiyGIX0OXnyValXcNMOLgZN0&play=true&offset=0&show=all

,

,
we get as the highest quality video:
96.4MB, 1280x720, 2000kbps, 29.970fps. in detail:
Code:
General
Complete name : C:\GetFLV\download\HD Video Gallery on CBS.com(2).flv
Format : Flash Video
File size : 96.4 MiB
Video
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.2
Format settings, CABAC : Yes
Format settings, ReFrames : 2 frames
Codec ID : 7
Bit rate mode : Constant
Bit rate : 2 000 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.072
Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
Transfer characteristics : BT.709-5, BT.1361
Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177
Audio
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : HE-AAC / LC
Codec ID : 10
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz / 22.05 KHz
Compression mode : Lossy
There is no need for "force HD". Just click on the "HD"-button

the streaming url of the HD-stream is (as copied from
GetFLV):
Code:
rtmpe://cp48590.edgefcs.net:1935/ondemand?ovpfv=1.1&?auth=dbEbRcTcxdXaLcAcaaSa4aLc5d.b1dLdXbS-bnScj2-h0-buy-HbBOfXsd&aifp=v001&slist=video/temp_hd_gallery_video/CBS_Production/CBS_Production_Entertainment/2008/10/02/Primetime/Survivor/Season_17/clips/Episode_03/