Friends i have Kdenlivecrash... Example i want edit 2 movies(mkv720p23.98fps) Combine and add+logo, add+text but render(mkv720p23.98fps) is not complete .. Who Can Help Me ?

Nobody can help you, unless you give us more information - we are not magicians.

Which render settings, which kdenlive version? What render formats did you already try? What is the output if you run kdenlive from command line and try to render? Maybe which OS and if ubuntuish which repository would be useful, too.