thank You a lot for Your answer! am sorry, i was a bit buisy ...
to set the gop-options would be great in the future! however i could get along without if the settings are set automatically to an appropriate value. i mean, i dont know, maybe there are other reasons for this anoying behavior that i can skip through the video. so i ve made screenshots with my settings
also i have analized an output video with gspot, here the results.
both you can see here
with this video i got waiting times when skipping forwar or backward between 1sec and 10sec, where in general i get better results when playing with divx-player than playing with vlc-player. also the pixelating effect appears mostly with vlc.
can You see a reason for this behavior with the given info or do You need more?