Sorry to resuscitate an older thread but was running into this problem with Vegas Pro 12 as well. I was using 3 GOP (Flow motion 2.02) and saw the "rain" (shows up in dark areas). I have also used Moon T5 no rain. This was using the .mts files directly on the import. If I resampled to prores 422 prior to NLE then there was no problem.

Has anyone figured out the source of this issue, it is not just Premiere Pro.

Thanks, but I already knew I could fix it on transcode. (At least now I know it is the deblocking on decode). I would like to avoid transcoding since going to ProRes 422 effectively quadruples my file storage for my project. This would put me into terabyte territory for my project. Unfortunately I haven't been able to find the decoder options in Vegas Pro 12.

You don't have to transcode to ProRes. You can transcode to h.264, or shoot intra, or go bug Sony to fix their problem.

I'm learning cs6 and have noticed considerable rain on my laptop screen, mainly with shots of the sky, so for some reason I wanted to look at how bad it would show up on a 50 inch plasma. To my surprise I reckon 75% of the diagonal rain disappeared when viewed on the plasma panel, as apposed to the lap top, or pc screen. I went and transferred a couple of more "rainy files", that were also shots of the sky, to sd card and got the same pleasing results when viewed on the plasma.
I went back and forth a couple of times and double checked, and if anything my plasma screen gives me a superior detailed picture all round, so I don't think it's a matter of rain not showing up because the plasma's not showing enough detail in the first place. Just sayin, because I'm interested to know if anyone else has experienced this, or if people are of the opinion that the plasma panel is tricking my old 'minds eye' ?

@DrDave It may well? I just went through the Panasonic handbook, but I can't find a reference to NR. Anyway in another recent topic "Panasonic ends plasma production" I was pleased to read that a few other people also think things look better on good plasma panel. First Johnnie Walker announce the end of Green Label Blended Single Malt, and now the end of Plasma, all in the one year!

OK I found P-NR in the menu, and it is defeatable. Has 3 settings and off. It was set on low, and even with NR off it still looks an improvement over the LCD as far as Diagonal Rain goes. Setting NR on High of course knocks the overall picture down a tad. I'll play around a bit more with it. Thanks.

@spreeni--seriously? Do you have a link to tests?

It would be solved in CS6 if they pushed out a new version with updated Main Concept MP4 libraries.

Not even "expectable". As they've been very clear about, CS6 is done. It's an old "ish" and they've moved on, but will still sell it to those who don't want to be on the CC versions. So no, there will be no upgrades of CS6.

You might get a "fix". You're welcome to wish. Personally, I wouldn't count on it. It's just a "might".

I guess I should have clarified, when I said CS6 I was specifically looking at After Effects, since I don't render anything out of Premiere. But, I just looked, the last update came in on the 10th as well. Some parts of CS6 that I have installed from CC are quite old however.

@rNeil - I understand the CC model and rationale behind it. I was responding to BurnetRhoades's comment about the new CS6 updates that are being pushed out to CC subscribers. Those should be going out to paid CS6 users in a timely manner as well. If they've already developed these and are distributing them to CC subscribers they should go to CS6 users at the same time.