[Per Spook]

This is commercials for TV-broadcasting. We produce graphics in PAL 16:9 and render it out from After effects uncompressed.
We only use premiere to produce the mpeg2 files for digital delivery to Viasat in the UK.
There is a 4:2:2 setting in the Adobe media encoder under profile settings. We think the problem might be with the GOP settings. When we encode with the standard settings (3M-frames and 12N-frames), the result looks good. but when we try to set m-frames and n-frames to 1 and closed gop every :0 we got bad results.
So what does I-frames only actually mean?
Also what: ITU-R BT.601-4 (RGB levels will not be accepted) Chroma: 4:2:2 (4:2:0 will not be accepted) means?
Under basic video settings in adobe media encoder you can choose a 4:2:2 option under profile but under level you can only choose between : High level, high 1440 level and main level

Does anyone know the right settings in adobe media encoder to fullfill the required specifications? If you do, please make a post.

[Per Spook]

what I mean is to attach a mask path to a tracker point, not a layer which is the obvious choice..

[Per Spook]

You should use a particle system, try particular: http://www.trapcode.com

Maybe the plugin even has a preset for snow, don’t remember, but it’s fairly easy to set up..

[Per Spook]

If you shoot with a 16mm camera (or other film camera), especially an older one. You get this effect automatically when excess light spills/comes in through the viewfinder.. very nice effect, it should work if you try the way Chase said.