Go Back   nV News Forums > Linux Support Forums > NVIDIA Linux

Newegg Daily Deals

Reply
 
Thread Tools
Old 12-30-09, 09:59 AM   #1
ggking7
Registered User
 
Join Date: Oct 2006
Posts: 48
Default VDPAU Anti-Judder?

Does VDPAU do any sort of frame interpolation of 24 fps video to avoid judder?
ggking7 is offline   Reply With Quote
Old 12-30-09, 10:17 AM   #2
jusst
Registered User
 
Join Date: Mar 2006
Posts: 99
Default Re: VDPAU Anti-Judder?

No, VDPAU can't do this afaik.
What might be doable within the applications using VDPAU is a pulldown to 60hz (like common on NTSC DVDs) or a speedup to get 25fps for 50hz PAL displays.
jusst is offline   Reply With Quote
Old 12-30-09, 11:38 AM   #3
ggking7
Registered User
 
Join Date: Oct 2006
Posts: 48
Default Re: VDPAU Anti-Judder?

OK, some of the new HDTVs do this, and I was hoping VDPAU would be a good substitute. Any plans for it?
ggking7 is offline   Reply With Quote
Old 12-30-09, 02:50 PM   #4
Lost Dog
Registered User
 
Join Date: Aug 2007
Posts: 151
Default Re: VDPAU Anti-Judder?

Many TV's have a pretty good interpolation of 24p material. The key would be playing at 24p and let the TV's do the rest.

I'm trying to figure out how to play my DVD's at 24p (I was told most movie (non TV video) DVDs are at 24p). I'm not sure if I'm getting it right though in mythtv. I have Toshiba 55SV670u LCD that does a great job with judder reduction on 24p material but first I need to feed it 24p material!
Lost Dog is offline   Reply With Quote
Old 12-30-09, 07:13 PM   #5
ggking7
Registered User
 
Join Date: Oct 2006
Posts: 48
Default Re: VDPAU Anti-Judder?

Lost Dog,

My Toshiba HDTV has a feature called "Film Stabilization". Is that what you're using? I've read that it interpolates 24p when it's set to "Smooth". It seems to work really well, but it doesn't help with the flashing effect I see on really intricate scenes in motion. Also, the green bar at the top of makemkv.com has some kind of a weird artifact in it when Film Stabilization is enabled. Do you see it?
ggking7 is offline   Reply With Quote
Old 01-01-10, 09:00 AM   #6
jyavenard
MythTV developer
 
Join Date: Mar 2006
Posts: 413
Default Re: VDPAU Anti-Judder?

Quote:
Originally Posted by Lost Dog View Post
Many TV's have a pretty good interpolation of 24p material. The key would be playing at 24p and let the TV's do the rest.

I'm trying to figure out how to play my DVD's at 24p (I was told most movie (non TV video) DVDs are at 24p). I'm not sure if I'm getting it right though in mythtv. I have Toshiba 55SV670u LCD that does a great job with judder reduction on 24p material but first I need to feed it 24p material!
MythTV >= 0.22 supports 24fps playback ; you just need to configure your nvidia card to be able to output 24Hz. If your TV doesn't report a 24Hz mode via EDID, then using a proper modeline in your xorg.conf is all you need.

For DVDs however, I can't think of one that is 24fps encoded ; they all are either 50fps or 60fps.
jyavenard is offline   Reply With Quote
Old 01-01-10, 10:50 AM   #7
Lost Dog
Registered User
 
Join Date: Aug 2007
Posts: 151
Default Re: VDPAU Anti-Judder?

Quote:
Originally Posted by jyavenard View Post
MythTV >= 0.22 supports 24fps playback ; you just need to configure your nvidia card to be able to output 24Hz. If your TV doesn't report a 24Hz mode via EDID, then using a proper modeline in your xorg.conf is all you need.

For DVDs however, I can't think of one that is 24fps encoded ; they all are either 50fps or 60fps.
I've been wondering about DVD's. I had thought they were 50fps or 60fps but on several A/V sites people have talked about their bluray players that upconvert DVD's to 1080_24p.

For video that is 24fps do you just need to select the option for "Separate video modes for GUI and TV playback" and keep everything at default? I have:

GUI: 1920x1080 Video Output: 1920x1080 Rate: any Aspect: 16x9

For Overides, all the "In X" and "In Y" are at 0. Outputs are 1920x1080, 720x480 and 320x175. All Rates and Aspects are set to "any".

Thanks for the info. This is one of the biggest things I've been wondering about with myth.

Neil
Lost Dog is offline   Reply With Quote
Old 01-01-10, 02:23 PM   #8
jusst
Registered User
 
Join Date: Mar 2006
Posts: 99
Default Re: VDPAU Anti-Judder?

Quote:
Originally Posted by Lost Dog View Post
I've been wondering about DVD's. I had thought they were 50fps or 60fps but on several A/V sites people have talked about their bluray players that upconvert DVD's to 1080_24p.

For video that is 24fps do you just need to select the option for "Separate video modes for GUI and TV playback" and keep everything at default? I have:

GUI: 1920x1080 Video Output: 1920x1080 Rate: any Aspect: 16x9

For Overides, all the "In X" and "In Y" are at 0. Outputs are 1920x1080, 720x480 and 320x175. All Rates and Aspects are set to "any".

Thanks for the info. This is one of the biggest things I've been wondering about with myth.

Neil
Upconverting to 1080p/24 is done in the following manner:
A: 60fps encoded content
A 3:2 pulldown was applied. Reverting this makes it possible to recreate the original 24fps

B: 50fps encoded content
A 2:2 pulldown was applied. Removing it generates a 25fps progressive signal. Now revert the so called PAL-speedup, which actually means playing the video slower. That's it.
jusst is offline   Reply With Quote

Old 01-02-10, 08:35 AM   #9
ggking7
Registered User
 
Join Date: Oct 2006
Posts: 48
Default Re: VDPAU Anti-Judder?

I'd like to point out that WinDVD, CrystalPlayer, and PowerDVD all do software frame interpolation:

http://en.wikipedia.org/wiki/Motion_..._video_players
ggking7 is offline   Reply With Quote
Old 01-02-10, 10:57 AM   #10
LauriM
Registered User
 
Join Date: Dec 2008
Posts: 19
Default Re: VDPAU Anti-Judder?

Quote:
Originally Posted by Lost Dog View Post
I've been wondering about DVD's. I had thought they were 50fps or 60fps but on several A/V sites people have talked about their bluray players that upconvert DVD's to 1080_24p.
NTSC DVD can have video encoded from 23.976fps progressive source and only flagged with rff/tff. The decoder then duplicates fields based on the flags to produce 3:2 pulldown.

Software players like MPlayer can ignore these flags and output original progressive video if the DVD is properly authored.

My guess is that bluray players (at least the Oppo I have) let the decoder do the pulldown and pass the resulting interlaced video to the video processor.

Some displays (like Pioneer Kuros) can take a video with 3:2 pulldown applied, recover the original film frames and display them with an even pulldown (3:3, 4:4 or 5:5) for smoother motion.
LauriM is offline   Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 03:50 AM.


Powered by vBulletin® Version 3.7.1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 1998 - 2014, nV News.