Check the Playback/Paused resolution settings for the Program Monitor in the sequence that contains the CS3 P2 files.
Does the pixelation in the "exported P2" files carry over to an export onto Blu-ray? Can you still see the pixelation on the HDTV, or only in Premiere Pro's monitor?
I'm going to try a burn via CS5 tonight to verify, as the CS3 Blu-ray is perfect. The playback/pause settings have been set to full. I'm also going to look at importing the files by themselves into new projects in case it's something like interlaced instead of progressive, or something like that. (1080i vs 1080p preset) It just seems odd that CS3 would be better with mixed media than CS5, and I am hoping someone knows why there is a difference.
Ok, interesting update!
I opened two new projects in CS5, and imported the "problem" CS3 P2 export footage. One project was preset to 1080p 24, the other set to 1080i 60. Still pixelated in the 1080p, but clear in the 1080i project, only when paused. Still pixelates when playing, even though resolution in the project window is set to full during both playback and pause. That's good enough for me! It would appear that even though the footage was shot in progressive mode, it still needs to be a 1080i project. Also, simply opening the CS3 project in CS5 and allowing automatic conversion opened the door to failure. I read somewhere that CS5 is more strict about formats than prior versions, and it appears to be true.
Also, I've read that DVCProHD footage out of the HVX-200P is not really progressive, regardless of 24p mode settings. That also seems to be true, based on this experience.
I'm still going to burn a BD-R just to make sure, and if I feel like blowing a second BD-R, I'll test the 1080p project export as well. Hopefully, this thread can help others with similar footage. I'm still curious what changes in the CS5 coding manifests this issue, where it didn't in CS3. I imagine that will only be answered by one of the developers that wrote the code, or another Adobe employee that knows via said developer.
Use BD-REs so you don't waste disks.
The HVX has progressive sensors and can record actual progressive media. It's 24p mode is delivered in a 30i stream, but the 24p sequence will remove the electronically added pulldown.
Hey, why didn't I think about BD-RE? Good idea!
See, I heard that to get actual progressive footage, you have to shoot in 720p, whereas 1080p will be something called "24p over 60i." There was more, something about 1080 actually being inferior quality because of throwing away frames versus 720p mode using all the data. I don't understand it, I'm just repeating what I was told by a guy that knows way more than I do. I didn't shoot the footage or choose the shooting mode, I was just handed the footage to edit, and they chose 1080/24p thinking it was the best quality. (:
It sounds like you know what I'm talking about better than I do, so maybe they both shoot 24p in a 30i or 60i stream?