WinRAR MPEG(video file) Compression Gone Haywire

[hech54]

When I compress an MPEG2 video file to an RAR file....I normally only get a few MB of savings. I understand that. That is normal.
So how come I just RAR'd a 202MB video file and it came out to 85MB?
I thought to myself....THAT CAN'T BE RIGHT....so I uncompressed it and presto...there was the 202MB video file in it's full glory.
WTF is going on?

[jagabo]

The last step of MPEG compression is a lossless entropy encoding much like archive programs use. That's why you don't get much more compression when you archive MPEG video. Are you sure the file you just compressed was MPEG encoded? Did it have a PCM audio track?

[hech54]

Format : MPEG-PS
File size : 210 MiB
Duration : 4mn 16s
Overall bit rate : 6 874 Kbps

Video
Format : MPEG Video
Format version : Version 2
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 4:3
Frame rate : 25.000 fps
Standard : PAL
Scan type : Interlaced
Scan order : Top Field First

Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 2
Bit rate : 384 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz

[hech54]

And here is the RAR file:
86.2 MB (90,479,972 bytes)
Today, March 20, 2012, 7:23:15 PM

[Cornucopia]

I've seen plenty of lossily-compressed media encodes that, when re-archived in a lossless compression format (zip, rar, sit, 7z, etc) will BLOAT. Partly because the resulting byte sequence of the lossily-encoded media file has pretty much ALL of its redundancy taken out of it, and redundancy is the thing that gives lossless archive compression its power...

Scott