Problem with m2v/mpeg2 playback in all CS5 Suite

My config : Mac Pro, installed with Windows 7 64bit - CS5 Production Premium
Hey,
Here is my problem, I've got to re-encode m2v files.
I just imported the m2v file into Premiere, or AME directly. I set up my settings for the encoding process. The result is quite excellent but not everywhere.  At some places, when the image is quite complicated, I've got compression artefact visible that are not present on the original file.
At the first time I tought the problem came from the reencoding bitrate, but in fact no. The problem is visible before the reencoding. If I play the orignal m2v in Premiere or AE, I can see those artefacts. But those one are not visible when I play the same original m2v in VLC or WMP.
Snapshot from VLC :
Snapshot from After Effect :
So I imagine, the problem comes from the way Adobe Creative Suite (Bridge ?) read/interprete the m2v files...
Does anyone know if there is a way to improve or change this ?
Thanks for your help !
Nico

Since this is not the original footage I wonder if the encoding went wrong.
It is odd that it plays better in VLC and Windows Media Player but not in Premiere.
I was able to notice the lines on the right hand side in VLC so something is wrong with the encoding I think.  ( see picture 3 )
Here is what I noticed when bringing it into Premiere.
On Clip 2
It plays fine till 5:18
But on 5:19 the artifacts appear.
One thing I did notice that the whole video shows some thing wrong with the right side going down the whole side.
There are lines running up and down about 20 pixels wide or so.
Here is a screen cap at 400%  ( Can be seen with VLC but not as bad )
Do you have the original copies of the video ?
At least you know its not just your computer.
Even you screen grabs in VLC show the lines to the right if you look hard you will see them.
My google search of the Sony Vizaro Encoder only brings back things from 2003.  Maybe that encoder cant handle it anymore but I have no knowledge on that.
Wish I could help more.
Post the original clips if you have them.
GLenn

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