I'm running KDENLive r1919 compiled from svn. I also installed recent MLT and MLT++ from svn. ffmpeg is also compiled/installed from SVN.
I have some video that I know is good -- it's mencoded to MPEG2 from AVCHD. The video plays perfectly in all of the players where I've tested it, but when I render the video using kdenlive the video is slightly narrow with black bars a few pixels wide on the left and right side. The video has vertical striations.
Here is a five second portion of each video without sound. They're not identical time lines, but close enough for comparisons' sake.
 Removed video [/edit]
I suspect an issue with MLT. I set my rendering target to dv_ntsc_wide. It comes out the proper width, but the issue isn't with that rendering line or choice, as I see the problems (striations and width issue) when rendering in the preview frame.
Thanks for your help!