first of all I just want to say english is not my mother langage so...
I make a soft to convert wtv to mkv or avi files. For some operations I use ffmpeg.
I got a pb with interlaced video.
I look around the manual of ffmpeg and saw that I can use the yadif filter option.
But whatever the parameters i gave to yadif my video is "wavy". The image is not very nice.
Here is a sample of what I call "wavy" : http://marlinge.davidetrachel.perso.neuf.fr/test.jpg
I try -vf yadif=0 or 1 or 2 or 3 combinate with all others 2 parameters.