Jerking after Rendering

Hi folks,

i have a strange problem with kdenlive 0.5 under Ubuntu Gutsy. I want to cut my videos (mp4 Format) with kdenlive. After open a video with hdv720 30p Format everthing is allright (Clipmonitor). But when i create (rendering) my Video i get some strange jerks. Here my rendering command:

format=mpegts size=1280x720 video_bit_rate=19700000 audio_bit_rate=384000 gop_size=15 profile=hdv_720_30p

I tried everthing with different parameters, but no success. If i edit my video with avidemux, theres no problem.

Has anyone an idea ?

'Thank you very much and excuse my bad english. ;-)