I am working with 1080p AVCHD footage from my Canon 7D. I want to transcode the footage to Avid DNxHD, as it's easier and quicker to edit with. However, I've noticed a quality issue with DNxHD in Kdenlive, there are fine vertical lines in the footage. These lines can be very distracting and obvious in certain scenes. This is rather disappointing, since DNxHD is supposed to be a near lossless format. I'm using Kdenlive 0.8.2.1, MELT 0.7.6 & ffmpeg 0.10.1 (I upgraded to the latest ffmpeg hoping to fix the issue).
I viewed DNxHD footage in VLC player but there are no vertical lines at all, it looks great as it should. I also used 5DtoRGB to transcode footage to DNxHD but the lines remain. The problem only occurs in Kdenlive, it somehow introduces vertical lines when it decodes DNxHD.
Has anyone seen this problem? Any solutions?
Here's a comparison between DNxDH and high bit-rate Mpeg4 exported from Kdenlive:
And the Original images: http://dl.dropbox.com/u/2055577/DNxHD/DNxHD180-Test.jpg & http://dl.dropbox.com/u/2055577/DNxHD/Mpeg4-Test.jpg