De-interlacing method

David M. Cole · May 7th, 2012, 08:32 AM

re: 25P

The result is properly de-interlaced 50i to 25P on a 120 Hz page-flipping. There are no visible de-interlace errors (e.g. tearing). What exactly are you asking for?

Prech Marton · May 7th, 2012, 08:53 AM

Oh, i like to see 50p, with frame doubled or bob or something nice deinterlace method!
Not just jumpy 25p, with dropped one filed!
So no hw. acceleration by anybody? :(

David M. Cole · May 7th, 2012, 11:16 AM

The NVIdia motion-adaptive de-interlace is VERY good. You know, 50i to 50P syntehsizes spatial data up the ying-yang (it's fundamentally line-doubling). 50i to 25P is a good trade-off between temporal and spatial data preservation.

In any case - the 25P looks good from an NVidia card. Not sure how to get a line-doubled 50P signal to look at, short of YADIF'ing one up.

RE: Playback - you can view up to 1080 60P on an NVIDIA page-flipping display. 50P is no problem (no frame dropping needed). Out to HDMI 1.4a is another story. Their your MAX for 1080 will be 24P. You'll have do down-sample to 720 to go to 25P or 50P without frame-dropping. You can also conform the 25P to 24P, easy enough.

Prech Marton · May 7th, 2012, 12:02 PM

Sorry, i don't understand you.

"The NVIdia motion-adaptive de-interlace is VERY good"

How can i use this with the player, when Peter sayed:
"the player drops one field, resulting in 25p, no matter what hardware you use"

I just want to view my TD10 50i files at 50fps like my old HDV mpeg2 50i footages...
(with mpeg2 i can set which codec to use, what deinterlace, etc)

edit: in the player you set deinterlace to on or off? If on, then the player drop one field, if off,
the vga card recognize that it is interlaced video, and use the hardware deinterlacing algorythm?

David M. Cole · May 10th, 2012, 12:06 PM

AH... sorry... took it a while to sink in. Peter is stripping of one field and line doubling in the presentation layer, before handing it to the video card. Damn. I verified that if you turn de-interlacing off in the SP settings, it display's as interlaced on the page-flipper display. NVIDIA's de-interlacing does not kick-in.

)-:

Prech Marton · May 10th, 2012, 12:23 PM

So you never saw great deinterlaced footage with stereoscopic player?
Then i don't understand this previous statement with GT 430:
"It has great motion-adaptive deinterlacing with Stereoscopic player"

David M. Cole · May 10th, 2012, 12:30 PM

1) The NVIDIA card has GREAT motion-adaptive de-interlacing.

2) Your footage didn't tear or suffer from any of the usual artifacts of bad de-interlacing

3) I thought your original issue was bad playback speed w/ de-interlacing turned on, which is not occurring on the NVIDIA card.

-- therefore -

I gave it a clean bill of health.

It's not easy to see the difference between stealing one field and doubling it to get 25P - or - actually de-interlacing to get 25P on a notebook page flipper. In fact, it's impossible. I assumed (incorrectly) that your concern was de-interlacing artifacts & speed.

This is one of those, "no good deed goes unpunished" moments. So, it's possible (but, I'm checking with Peter), that this statement was not entirely accurate, " Stereoscopic Player will deinterlace on the fly. Depending on your video card, you'll generally get quite decent hardware deinterlacing." Should have said, "will get decent playback speeds w/ software line-doubling."

Prech Marton · May 11th, 2012, 04:18 AM

I never wrote about bad playback speed.
For me 50i footage to jerky 25p means "bad de-interlacing"
thanks

May 7th, 2012, 08:32 AM	#31
David M. Cole Regular Crew Join Date: Sep 2009 Location: Ft. Lauderdale, FL Posts: 166	Re: De-interlacing method re: 25P The result is properly de-interlaced 50i to 25P on a 120 Hz page-flipping. There are no visible de-interlace errors (e.g. tearing). What exactly are you asking for?

May 7th, 2012, 08:53 AM	#32
Prech Marton Major Player Join Date: May 2004 Location: hungary Posts: 462	Re: De-interlacing method Oh, i like to see 50p, with frame doubled or bob or something nice deinterlace method! Not just jumpy 25p, with dropped one filed! So no hw. acceleration by anybody? :( __________________ Relaxing clips with waterfalls and music, 3D photos, 3D videos: www.3d-video.hu

May 7th, 2012, 11:16 AM	#33
David M. Cole Regular Crew Join Date: Sep 2009 Location: Ft. Lauderdale, FL Posts: 166	Re: De-interlacing method The NVIdia motion-adaptive de-interlace is VERY good. You know, 50i to 50P syntehsizes spatial data up the ying-yang (it's fundamentally line-doubling). 50i to 25P is a good trade-off between temporal and spatial data preservation. In any case - the 25P looks good from an NVidia card. Not sure how to get a line-doubled 50P signal to look at, short of YADIF'ing one up. RE: Playback - you can view up to 1080 60P on an NVIDIA page-flipping display. 50P is no problem (no frame dropping needed). Out to HDMI 1.4a is another story. Their your MAX for 1080 will be 24P. You'll have do down-sample to 720 to go to 25P or 50P without frame-dropping. You can also conform the 25P to 24P, easy enough.

May 7th, 2012, 12:02 PM	#34
Prech Marton Major Player Join Date: May 2004 Location: hungary Posts: 462	Re: De-interlacing method Sorry, i don't understand you. "The NVIdia motion-adaptive de-interlace is VERY good" How can i use this with the player, when Peter sayed: "the player drops one field, resulting in 25p, no matter what hardware you use" I just want to view my TD10 50i files at 50fps like my old HDV mpeg2 50i footages... (with mpeg2 i can set which codec to use, what deinterlace, etc) edit: in the player you set deinterlace to on or off? If on, then the player drop one field, if off, the vga card recognize that it is interlaced video, and use the hardware deinterlacing algorythm? __________________ Relaxing clips with waterfalls and music, 3D photos, 3D videos: www.3d-video.hu Last edited by Prech Marton; May 7th, 2012 at 01:07 PM.

May 10th, 2012, 12:06 PM	#35
David M. Cole Regular Crew Join Date: Sep 2009 Location: Ft. Lauderdale, FL Posts: 166	Re: De-interlacing method AH... sorry... took it a while to sink in. Peter is stripping of one field and line doubling in the presentation layer, before handing it to the video card. Damn. I verified that if you turn de-interlacing off in the SP settings, it display's as interlaced on the page-flipper display. NVIDIA's de-interlacing does not kick-in. )-:

May 10th, 2012, 12:23 PM	#36
Prech Marton Major Player Join Date: May 2004 Location: hungary Posts: 462	Re: De-interlacing method So you never saw great deinterlaced footage with stereoscopic player? Then i don't understand this previous statement with GT 430: "It has great motion-adaptive deinterlacing with Stereoscopic player" __________________ Relaxing clips with waterfalls and music, 3D photos, 3D videos: www.3d-video.hu

May 10th, 2012, 12:30 PM	#37
David M. Cole Regular Crew Join Date: Sep 2009 Location: Ft. Lauderdale, FL Posts: 166	Re: De-interlacing method 1) The NVIDIA card has GREAT motion-adaptive de-interlacing. 2) Your footage didn't tear or suffer from any of the usual artifacts of bad de-interlacing 3) I thought your original issue was bad playback speed w/ de-interlacing turned on, which is not occurring on the NVIDIA card. -- therefore - I gave it a clean bill of health. It's not easy to see the difference between stealing one field and doubling it to get 25P - or - actually de-interlacing to get 25P on a notebook page flipper. In fact, it's impossible. I assumed (incorrectly) that your concern was de-interlacing artifacts & speed. This is one of those, "no good deed goes unpunished" moments. So, it's possible (but, I'm checking with Peter), that this statement was not entirely accurate, " Stereoscopic Player will deinterlace on the fly. Depending on your video card, you'll generally get quite decent hardware deinterlacing." Should have said, "will get decent playback speeds w/ software line-doubling."

May 11th, 2012, 04:18 AM	#38
Prech Marton Major Player Join Date: May 2004 Location: hungary Posts: 462	Re: De-interlacing method I never wrote about bad playback speed. For me 50i footage to jerky 25p means "bad de-interlacing" thanks __________________ Relaxing clips with waterfalls and music, 3D photos, 3D videos: www.3d-video.hu