1, outdated:

update: it didnt work on my cssu stable, same error
however, it does work on cssu testing with similar system settings!
the same error gives up when recording any video options on stable.
on testing it works.

any ideas? should i look at some specific packages?
no other packages were installed during updating to 0.3.8)

2, edit:

succes, it does work! After manually installing the good-extra plugins.
the gstreamer good plugins were already on both n900s (1 testing/ 1 stable)

thanks so much.