There are several ways that NTSC players can choose to playback PAL.
- One of the worst methods adds geometric distortion.
- Another terrible method deinterlaces.
- Yet another just adds ghosted frames.
The best DVD player method adds ~5 frames, without changing audio. The motion is somewhat less smooth, but it's better than screwing up the geometry, the interlacing, or adding ghosting.
The ideal PAL > NTSC method requires Avisynth, or a similar method. Rip the disc, convert, re-author. Of course, this takes time, and may not be worse it just to watch a movie.
The Denon just uses subpar conversion, it seems. Many "no name" players are like this. Only some of the higher-end (and higher-priced) players from Pioneer, Toshiba, Sony, Samsung, etc, tend to use the better methods. At this late date, DVD players are out, and Blu-ray players are in. The Samsung, for example, cannot player a PAL disc, but a PAL video streamed to it plays flawlessly.
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