| Author |
Message |
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Tue Apr 16, 2013 7:38 pm Post subject: Double frame rate |
|
|
Hello,
Is there a simple device which can double the video frame rate (HDMI in, HDMI out)?
For example 1080p24 -> 1080p48
Thanks
|
|
| Back to top |
|
 |
kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
|
| Posted: Tue Apr 16, 2013 7:54 pm Post subject: |
|
|
Simple? I don't think so. At least I haven't heard of one.
The biggest reason one doesn't exist is that there is zero market for it. All displays today that accept 1080p24 (which is most digital projectors, TVs, etc) multiply the frame rate to the speed of the display already internally, so there's no need for an external box to do it.
Why do you want something to double the framerate from 1080p24 to 1080p48? There was an era about 10 years ago where it was the latest thing to do with CRT but eventually most people decided it flickered too much and stopped using it. I tried it myself but only for about 30 mins. Too much flicker for me.
Kal
_________________
Support our site by using our affiliate links. We thank you!
My basement/HT/bar/brewery build 2.0
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Tue Apr 16, 2013 8:18 pm Post subject: |
|
|
Kal,
It was just an example. My idea is to double 1080i@48 to get 1080i@96. I have a Lumagen HDQ just to do that which is a big device just to do this simple thing. I read that the HDFury 4 (but too expensive for me) can also do that, but I was more looking for a box like the Darblet.
|
|
| Back to top |
|
|
barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
|
| Posted: Tue Apr 16, 2013 8:23 pm Post subject: |
|
|
| kal wrote: | | Why do you want something to double the framerate from 1080p24 to 1080p48? There was an era about 10 years ago where it was the latest thing to do with CRT but eventually most people decided it flickered too much and stopped using it. I tried it myself but only for about 30 mins. Too much flicker for me. |
Hi,
I think that the device in question would be a frame doubler. Some scalers should be able to acheive this, only that very few or maybe none would be able to do that on a 1080p24 signal. But maybe on other input signals.
Kal: I don't understand Your comment above. Doubling the frame rate should be the best solution for reducing any flicker. In Germany we had 100Hz CRT televisions (I got my first one in 1989. It had a 3MBit dual-ported frame memory. 50Hz in and 100Hz out). Their picture was remarkably stable and flicker-free, especially on larger picture tubes (26" and larger). The same tube size with conventional technology would produce intense flicker, especially at bright scenes due to the low refresh rate...
Regards,
barclay66
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Tue Apr 16, 2013 8:26 pm Post subject: |
|
|
|
I was not talking about progressive signals. Only interlaced (1080i).
|
|
| Back to top |
|
|
kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
|
| Posted: Tue Apr 16, 2013 8:28 pm Post subject: |
|
|
| barclay66 wrote: | | Kal: I don't understand Your comment above. Doubling the frame rate should be the best solution for reducing any flicker. |
Sorry for the confusion, my point was:
24Hz rate on CRT is complely unwatchable due to flicker, many CRT displays won't even sync that low. It's a non-starter. It can't be used on CRT.
48Hz rate on CRT still fkickers for most peopel, making it annoying to watch.
So I was comparing what most people do (60Hz) vs. 48Hz. 48Hz flickers more.
In North America someone long ago decided that all content (24Hz film content and 30Hz video) should be shown at 60Hz. It's a good compromise between reducing flicker and not pushing the eletctronics too hard.
The numbers above are rounded off.
Kal
_________________
Support our site by using our affiliate links. We thank you!
My basement/HT/bar/brewery build 2.0
|
|
| Back to top |
|
|
stridsvognen
Guest
|
| Posted: Tue Apr 16, 2013 9:37 pm Post subject: |
|
|
Well out of curiosity, i just checked my DVDO VP50 and it will output 1080i up to 133,33hz.
And they come cheep these days.
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Tue May 14, 2013 9:42 am Post subject: |
|
|
| kal wrote: |
In North America someone long ago decided that all content (24Hz film content and 30Hz video) should be shown at 60Hz.
Kal |
How can you watch 24Hz film display at 60Hz without judder?
|
|
| Back to top |
|
|
kal
Forum Administrator
Joined: 06 Mar 2006
Posts: 18114
Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
|
|
| Back to top |
|
|
Corleone88
Joined: 09 Dec 2006
Posts: 474
Location: France
|
| Posted: Wed May 29, 2013 8:49 am Post subject: |
|
|
| stridsvognen wrote: | Well out of curiosity, i just checked my DVDO VP50 and it will output 1080i up to 133,33hz.
And they come cheep these days. |
Is the DVDO Duo able to output 96Hz with 1080i? I checked the user's manual and I didn't see any input for vertical refresh rate setting.
|
|
| Back to top |
|
|
|
|
