I even further figured out what the problem was -- my input video was a 640x480 .avi capture (interlaced), the MainConcept encoder first stretched it to 720x576 (so that lines corresponding to the upper and lower fields stretched too, one now in fact occupies 2 lines, another only one -- but the resulting stretched video is further treated as interlaced, although we no longer can say whether this line is from top or bottom field), then honestly compressed the video as interlaced mpeg2. Yes, the resulting mpeg file is interlaced, but fields are made up of random lines!
It doesn't make sense on computer screen, but when viewed on TV via dvd player, the player first deinterlaces video, and because of deinterlacing the picture becomes distorted.
TMPGenc, Canopus ProCoder, and CCE all made the resizing correctly, but not the MainConcept encoder -- is that a bug or I missed anything in the settings? I haven't tested MainConcept encoder with a 720x576 source, probably it would work fine when resizing is not neecessary.
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