Videophiles - why would progressive scan interpolate the field frames backwards?

[Deja Q]

Playing movies on my system looks great.

But TV shows are showing obvious interlaced artifacting in moving areas.

Using an HDMI cable, checking to ensure TV is receiving a 720P signal from the DVD player, why would it merge the two fields in reverse, causing the interlace problem?

Thanks!

[Poiuyt]

1. It's not interpolating the fields backwards

Interlaced video (NTSC) is shot 60 fields per sec., with even and odd field alternating to make 30 frames per second. When interlaced video is shown on a progressive scan monitor, the scans will alternate between even and odd line, but will show them as full frame, instead of alternating lines. Since the scan lines in the NTSC have been recorded at different points in time and then averaged together, it can introduce motion artifacts.

[rug]

2. Get a room.

[Poiuyt]

5. You guys LOVE it when I talk TV

[Deja Q]

3. Oh. Would still items look jagged as well; part of the interlace artifacting?

Credits text looks jagged too...

I still don't fully understand, especially when films on DVD (movies) don't do it. I'll get used to it somehow...

[Poiuyt]

4. What you're getting is called "twittering"

see http://en.wikipedia.org/wiki/Interlace

[Deja Q]

6. Even moving lips when the characters are talking? (typically horizontal detail)

Thx for the link; I am learning more and more... though if all this gear provides deinterlacing, it's funny that the moving images consistently produce this effect.

http://en.wikipedia.org/wiki/Deinterlacing

I think the problem is 'weaving' - see above link

[pokerfan]

7. wiki has a pretty good article on the effect

http://en.wikipedia.org/wiki/Interlace#Problems_caused_by_interlacing

ETA: Poiuyt beat me to it.

[Deja Q]

13. Actually, I just found the actual problem:

http://neuron2.net/LVG/default.htm



I want to say the fields are being processed in reverse order, hence the combing effect. Still trying to fathom why this is happening... (probably a bad disc encode, but for more than one disc and on more than one series? )

[Deja Q]

8. One daytime kick with emphasis on reply #6

:)

[SoxFan]

9. I'd run a diagnostic

on the flux capacitors

[billyskank]

10. Question: how do they convert 24fps film to 25fps TV/video?

I have long wondered what they do about the frame rate difference.

[AllegroRondo]

11. every second they add a bonus subliminal frame

advertizing Olive Garden

[billyskank]

12. Vote Republican

What?