Poor quality video after rendering

Hello everyone,
I'm trying to make a Blu-ray DVD of a 1920 X 1080 avi clip of a looping logo for a client's show. The clip looks ok in the avi form (compressed with laragith codec) but when I turn it into Mpeg2 HD it looks worst with jagged edges on everything. I have tried both Mpeg2 & H.264. I have done CBR recording at max quality & close to max data rates. The original clip is 1920 X 1080 (1.0) 30fps and I have rendered it in Premiere CS3 with a custom timeline of 1920 X 1080 (1.0) and tried both progressive and interlaced without much difference. Any suggestions? Thanks in advance.

Okay, here goes the entire story. We use a program called Office FX made by a company called Instant Effects to add motion video to our power point presentation. Now the other day a client that we're about to do a show for requested a looping logo for some side screens. We had created this effect in Office FX and now had to find a way to place it on a Blu-ray disc. You can "publish" a file from Office FX, but the only choices are 1)Uncompressed, but with a 2GB limit, 2) DivX, which can't be read by either AE or Premiere, 3) Lagarith, which is a LOSSLESS codec. Since the clip is 30 seconds in length the uncopressed option is out. The Lagarith clip (which is about 200 MB in size) actually looks pretty good, through you can see the start of some the problems I'm having ( I failed to mentioned the banding issues which seems inherent in Mpeg2). So to recap. 1) I can only use Lagarith, 2) It is Lossless and pretty good, 3) The avi is 30 seconds in length and 200 MB in size. The resulting Mpeg2 and H.264 files are 1:30 in length (I tripled them on the timeline) and around 400 MB in size. I have tried 1080i at 29.97, and 1080p at 24. The best result I've had in removing the jagged edges is with H.264 but the downside has been codec artifacts (square boxes showing up in the image). Also, please note I did a custom timeline with 1920 X 1080 (1.0 pixels) and laragith as my render

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