Hiho Martin, many thx here too for your answeres in the other animation topic!
To your codec problem:
First thing i would do is to uninstall/delete the codec pack again.
That codec pack isn´t useful for anything (and also causes sometimes more problems then it helps i red).
Your CS6 incl. AE (maybe Premiere too) should come along with all you need to get clean results and renders in dozens of codecs and formats.
The most popular media players nowadays can handle tons of codecs and formats natively.
On my Windows 7 64 PC i am using the more or less famous VLC media player (freeware) to replay clips, movies and stuff, even self produced and rendered HQ ones.
That player eats all standarts until a file is rly broken/damaged.
But yeah, Flash Video, shouldnt be your 1st choice in all for high quallity clips for tubes like Vimeo.
Indeed, the best codec/format for HQ Vimeo clips should be your mentioned MP4/H.264 with a max. resolution of 1920/1080 pix.,
24,25 or 30 frames and with a max. quallity of 5000 kbps.
Dont know what went wrong with your settings or renders.
But 1st: Kill the normally useless codec pack and after this, let something run like CCleaner from Pirisoft (freeware and i love it).
http://www.ehow.com/how_6330416_remove-k_lite-codec.htmlhttp://www.piriform.com/ccleanerTry again see if the problem appears again, GL!
Alternate you could also try to use Premiere instead of AE (of course IF you have Premiere in your CS).
Premiere is easy to manage if you just want to render a simple animation movie from rendered image files.
But i dont know if Premiere CS6 can handle EXR.´s in a proper way now..
At first you just have to choose your working folders, resolution and framerate you are aiming at.
Then import all of your rendered images as "clip" file. Throw that clipfile into the timeline, take a preview or not, be sure that your working area includes the whole scene,
go to export - media then.
Adobe Media Exporter will pop up and there you can choose any format and codec you want for output. There you can also cut out possible black bars if your scene doesnt fits perfect into a choosen standart resolution.
Dont forget to check all HQ options like "render with max depth" and stuff and use VBR, 2-Pass for moving, fuzzy contents like your water animation (Bitratecoding).
Thats it..
I hope you will find a solution soon as possible.
To your picture:
It´s looking very natural and kinda "fresh, cool, and clear".. After i watched your clip a few times in a row, i became rly thirsty - no joke!