This tutorial shows how to create a custom profile in Kdenlive, including video size, frame rate, interlacing, PAR and DAR.
Links:
[1] http://kdenlive.org/category/books-and-tutorials/custom
[2] http://kdenlive.org/category/books-and-tutorials/custom-profile
[3] http://kdenlive.org/category/books-and-tutorials/profile
[4] http://blip.tv/file/get/Jmpoure-KdenliveVideoTutorialHowtoCreateACustomProfile831.flv