Thread: TiVo TiVo Picture Quality
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Old 11-05-2011, 18:40   #264
Lew
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Location: Fleet, Hampshire
Age: 54
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Re: TiVo Picture Quality

I wonder if the TiVo code is assuming that the odd field is scanned first like it is on SD NTSC video, whereas PAL scans the even field first. That would certainly explain the wrong field order.

---------- Post added at 16:19 ---------- Previous post was at 16:17 ----------

Quote:
Originally Posted by DaBoz View Post
So you think this is fixable with a software update?
If it is simply a field order error in their de-interlacing code then it could be as simple as changing a flag in the code. The problem with software though, is that it could just as easily be really complicated to fix.

---------- Post added at 16:23 ---------- Previous post was at 16:19 ----------

I've taken some photos of the text on channel 999 to show the differences when using different settings on the TiVo. My camera was mounted on a tripod and set to full manual mode so the settings are exactly the same for all 3 photos.

This is how the text looks when I set the TiVo to 576i only and let my TV handle the conversion to 1080p

[img]Download Failed (1)[/img]

This is how it looks when I set the TiVo to 720p

[img]Download Failed (1)[/img]

This is how it looks when I set the TiVo to 1080i

[img]Download Failed (1)[/img]

Notice how even though the text looks smoother in 720p mode it looks distorted vertically due to the (supposed) wrong field order.

---------- Post added at 17:03 ---------- Previous post was at 16:23 ----------

A few more pics, zoomed in so that the pixels are visible, desaturated and the levels tweaked:

576i (TV de-interlacing and upscaling)



720p



1080i



---------- Post added at 17:40 ---------- Previous post was at 17:03 ----------

Here's an example of what happens to static text when the odd and even lines are swapped.

[img]Download Failed (1)[/img]

Look familiar?
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