Hello guys,
I just wanted to inform people that they told me previously and visitors of this topic, about how he ended my attempt to become a contributor Shutterstock.

Mission complete! 

I already have 45 videos uploaded to SS of which 0 rejected!
I also already another package of video to load then all is well.

As for the use of MPEG Streamclip, I have not needed it.
I just found the right settings and composition rendering in After Effects CS5.

For those who need it (in my case it was these):

Composition Settings:
HDTV 1080 29.97
Resolution: 1920x1080 px
full resolution
Pixel Square
29.97 fps

Rendering Settings:
Format: QuickTime (. Mov)
Video Codec: PHOTO-JPEG with quality of 95/100

A greeting and thanks especially to users that they responded to my previous post.

Bye bye!

thanks for the quick answers, however we do not currently use neither a camera nor a camera, my videos are a figment of my imagination and create them only basing on strumeti me that Adobe After Effects CS5 provides.

What actually I need to know are the settings I select to create videos with a resolution of 1920 x 1080, the maximum resolution and with the format and the correct codec.
In the screen that I have attached in my first post, there are all the menus and menu pop-up windows settings that After Effects offers me.
Could you kindly tell me which ones to select?

I am currently working with plans and 123rf, movies were always accepted (except those who did not like the examiners).
The settings you use with them can be found in the screen below:

http://tattic.altervista.org/img/FORUM_microstock/GoodSettingsFor_Fotolia_123rf.jpg

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In this other screen, I put another saving option that could possibly go well, tell me if it is so or if I have to make other changes.

http://tattic.altervista.org/img/FORUM_microstock/Option_with_MOV_format.jpg

Thanks.