I have problems using proxy clips with kdenlive from sunab's ppa repo on Kubuntu 11.10 beta 2 64bit. When I enable proxies in the project settings and switch on the proxy for my full HD 1080p material I only get the error message "proxy crashed" (actually, the localized variant of this message). For one or two short 20 secs or so clips I got proxies, but otherwise only crashed proxies.
Also, while my i5 quad core is more or less idle when playing fullHD footage, kdenlive often enters "slide show mode" when repositioning the current position from which to play the video. I've played around with one or three threads in kdenlive, but the result is the same. However, the system is perfectly capable of playing multiple fullHD videos at the same time, even with scaling and transparency, so the CPU and system power should be reasonable sufficient.
Any help or clues?