The project is an HD 1080p 25 fps of 18 minutes. Kdenlive 0.8.3, KDE 4.7.3.
I try with File Rendering MP4 (various bitrate) and I get the message in the subject.
I also try with H.264 (various bitrate) and the job stop at 20%.
I also try with Lossless / HQ (h.264 and mp4) with same result.
Anyone can help me ??