I apologize if I missed the answer to this in the forums. But, I've been having trouble producing a file format that can be read by Windows. (The rendered projects work fine on Linux).
My first attempt was an mp4 file. This produced: "error -2041: an invalid sample description was found in the movie" on RealPlayer. I found a lot of references to this error on the internet but few solutions (none of which worked).
I also tried mpg, which produced a video image with a patchwork of coloured squares superimposed.
Lastly, I've just tried an .rm format (200k) NTSC. But, RealPlayer reports "a General Error" (not a very helpful error message...)
I'm using kdenlive 0.7.8 and melt 0.5.10
I must admit that video file formats are a mystery to me. Any help is greatly appreciated.