[galca002]

A quick background into the problem I'm asking:

Using 24p (or 24 fps) video in a 60 Hz HDTV still produces judder because 60 is not a multiple of 24 and thus the 24 fps video will not be equally displayed usin the 60Hz TV. However, since refresh rates of 24, 48, 72, 96, and 120 are multiples of 24, then these refresh rates are able to handle 24fps signals by simply showing the same frames more times.


Here's my problem: I currently have a Toshiba 40RV525U 1080p 60Hz HDTV. Considering what I mentioned earlier, does this mean that my television only accepts the 24 fps signal and forces it into 60hz? or does the TV reconfigure itself from the advertised 60hz rate to a 24hz or 48hz rate to more adequately carry the 24 fps signal?

Also, if the first situation is true, then is there any way to vary the tv's actual refresh rate to something that is a multiple of 24? The toshiba website says that the maximum tv refresh rate for this set is 60 Hz, so could I possibly set the refresh rate to something under this, such as 48hz or even 24 hz? I was really excited about my TV's use of 24fps but was saddened to learn about this.

(The info for my TV is here http://www.tacp.toshiba.com/televisi...model=40rv525u

and here http://reviews.cnet.com/flat-panel-t...-33248762.html )

 

[guardian44]



Quote:
Originally Posted by galca002 /forum/post/15398140


A quick background into the problem I'm asking:

Using 24p (or 24 fps) video in a 60 Hz HDTV still produces judder because 60 is not a multiple of 24 and thus the 24 fps video will not be equally displayed usin the 60Hz TV. However, since refresh rates of 24, 48, 72, 96, and 120 are multiples of 24, then these refresh rates are able to handle 24fps signals by simply showing the same frames more times.


Here's my problem: I currently have a Toshiba 40RV525U 1080p 60Hz HDTV. Considering what I mentioned earlier, does this mean that my television only accepts the 24 fps signal and forces it into 60hz? or does the TV reconfigure itself from the advertised 60hz rate to a 24hz or 48hz rate to more adequately carry the 24 fps signal?

Also, if the first situation is true, then is there any way to vary the tv's actual refresh rate to something that is a multiple of 24? The toshiba website says that the maximum tv refresh rate for this set is 60 Hz, so could I possibly set the refresh rate to something under this, such as 48hz or even 24 hz? I was really excited about my TV's use of 24fps but was saddened to learn about this.

(The info for my TV is here http://www.tacp.toshiba.com/televisi...model=40rv525u

and here http://reviews.cnet.com/flat-panel-t...-33248762.html )

Very sorry to say you cannot achieve what you want, what we all want, with your present TV.


Judder elimination is rather a Holy Grail these days. I can tell you I am seeking it out on a daily basis. 3:2 pull down is what gives rise to judder. And as you can see from the specs of your own TV, it achieves 24p compatibility by using 3:2 pull down. This is extremely common, by the way. You have not been singled out for rough treatment.


The only sets I know of that beat this judder problem - without flicker - are the Pioneer Kuros. They are faboulous televisions but they are pricey.

They defeat judder because they are 72Hz capable and 72 is an integer multiple of 24.


I fully expect Panasonic will have a 72Hz (or 96hz) plasma set out within a year. That's just MHO but they desperately need to address the deficiencies of their present 60Hz-48Hz plasmas. At 60Hz they feature judder and at 48hz the refresh rate is too slow - there's no judder but you see flicker.


If you want to go LCD there are 120Hz [120 is another integer multiple of 24] sets that will do the job for you in terms of judder elimination. But then you lose the very high INHERENT contrast ratios of plasmas. That's a worse thing to suffer through than judder itself.


If you are on a tight budget and you don't want judder OR flicker, I don't know how to do it - not on the cheap.