it's possible to pass such characters by url encoding them. try following command with
this version of rtmpdump. in debug log you can see it's sending correct playpath. although there seems to be another problem with your command line may be missing page url or auth code etc.
Code:
rtmpdump -V -r "rtmpe://videodersane.uzaktanegitim.gen.tr/vod//mp4:video_ders_2013/soruc%F6z%FCm%FC/gygk/t%FCrkce/01.mp4" -W "http://videodersane.uzaktanegitim.gen.tr/Content/swf/StrobeMediaPlayback.swf" -o Test.flv
Code:
DEBUG: HandleInvoke, received result for method call <createStream>
DEBUG: SendPlay, seekTime=0, stopTime=0, sending play: mp4:video_ders_2013/sorucözümü/gygk/türkce/01.mp4
DEBUG: Invoking play