I have the same problem with OpenShot 1.1.3-1 which uses libmlt2 0.5.4-1 on 
lucid x86_64.  Attached screenshot shows vertical black and white lines in dark 
areas of exported video.  Can also be seen playing the unmodified source files 
straight from camera with melt command line player.  Seems to be this upstream 
bug in mlt:
http://sourceforge.net/tracker/?func=detail&aid=2972137&group_id=96039&atid=613414
which seems to be fixed in 0.5.6.  Can we hope for an update in lucid soon?  
OpenShot seems to be the only user friendly editor capable of converting 
framerates and encoding highly efficient h.264 output.  Pitivi, Cinerella et al 
don't work in one way or another.  This problem here is the only show stopper 
ATM.

** Bug watch added: SourceForge.net Tracker #2972137
   http://sourceforge.net/support/tracker.php?aid=2972137

** Attachment added: "Screenshot of video processed by mlt showing black and 
white vertical stripes/lines in dark areas"
   
https://bugs.launchpad.net/ubuntu/+source/mlt/+bug/577334/+attachment/1542722/+files/shot0002.png

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White artifacts during playback and after rendering
https://bugs.launchpad.net/bugs/577334
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