Is it possible to render in Kdenlive a clip into frames for example .png frames, I know how to save single frames in .png, but I want generate whole video. Is there planned support for OpenEXR in Kdenlive.

Dunno about kndelive, but there's a very good plugin for that available for GIMP:
http://carol.gimp.org/gimp2/animation/gap/extract/

You can export your movie frames in png format by creating a new rendering profile, using:

extension: png
avformat parameters: f=image2 vcodec=png an=1

AND: the name for your output file must end with: %05d, like:

/home/user/frames%05d.png

The frames will then be saved as:
/home/user/frames00001.png
/home/user/frames00002.png
(...)
See picture that shows a copy of the rendering dialog with that profile

Thx a lot j-b-m, it works. Is there any documentation how to create render profiles with those scripts? I can't find any :(

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Sorry for my English.