I converted the original file avi (XVID), 560 x 320, 16:9, 25 frames/second to both PAL DVD (720 x 576, 4:3, 25 frames/second) and NTSC DVD (720 x 480, 4:3, 29.97 frames/second) as well. My standalone DVD player can play both PAL and NTFS. When I play the NTFS DVD it seems the movie is playing a bit smoother than PAL DVD. Is it possible? If yes, what is the reason? Aspect ratio?
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Thread: NTFS smoother than PAL?
NTFS is a Windows file system. You mean NTSC. There's no reason an NTSC DVD should play more smoothly than a PAL DVD on a PAL system. A 25 fps source converted to PAL should be smoother. But without seeing samples of the converted videos it's hard to speculate.
You may not be doing apples to apples conversions here. We would need to know if the source is progressive (likely) or interlaced (unlikely but not impossible for AVI). Your PAL and NTSC conversions may not be the same either in that one may be progressive and the other interlaced. I've seen motion issues when frame rate conversions and interlaced video are involved.
I fail to see the point in making an NTSC dvd anyway and at 4:3 from an approx 16:9 source.