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2nd August 2014, 16:20 | #1 | Link |
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Why 50hz and 60Hz in 4K Broadcast
With 4K TV Broadcast using HEVC, there will be no more Interlace Video ( Hurray ! ) and allows only 50P or 60P.
My question is why the need for choice between 50P and 60P? When today's newer TV sets they could handle even up to 120hz. So why we still need to have two option and not just standardize on one? |
2nd August 2014, 18:19 | #2 | Link |
brainless
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just because legacy contents (480i, 576i, 1080i) need to be able to be re-used on 4k broadcasting.
conversion from 50hz content to 60hz just to be able to broadcast it on 4k would introduce a very unnecessary impact on image quality. Isn't the standardization reached over the years not enough? 1) analogue video was totally incompatible (PAL vs NTSC) 2) digital SD video standardized colour coding as well as horizontal image resolution 3) digital HD 720p/1080i standardized vertical resolution as well 4) standardizing the framerate would cripple the incompatible standard The only way a standarization would work is this: Go to 300hz refresh rate. It is evenly dividible by 25, 30, 50 and 60 hz. Thus no problems will exsist by even mixing all of these framerates into a 300hz container.
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3rd August 2014, 10:41 | #3 | Link | |
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Quote:
24 doesn't go into 300 very well, one 1/2 frame blend and 12 clean frames per frame, 600Hz it is. For now, 50p and 60p is quite nice but I hope they have something for 24fps? Last edited by Asmodian; 3rd August 2014 at 10:51. |
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5th August 2014, 12:09 | #5 | Link |
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Reason is simple - this will be to expensive - side to this there is no 120Hz (300Hz) sources. And providing higher framerate and higher resolution at the same time make this all insanely expensive in reasonable - predictable future.
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5th August 2014, 20:50 | #6 | Link |
Life's clearer in 4K UHD
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Why stop there... 1200Hz would offer support for everything including 48 frames per second (Hobbit anyone)
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12th August 2014, 22:14 | #9 | Link |
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Fixed frame rates are a relic of a soon-to-be bygone age, says I
NVIDIA G-Sync: Death of the Refresh Rate (pcper.com) Frames can be displayed at any time, but it takes some advanced processing to maintain consistent brightness levels - which is why displays currently limit the frame rates they support. Arbitrary frame rate support is coming, but how soon is a question. Gamers are driving the technology here - they want to see the display refresh as soon as a new frame is available, without waiting for the next 1/60 sec interval, or whatever that interval may be. NVIDIA G-Sync is a hardware solution aimed at OEMs which does that processing. I don't see why that tech can't also support arbitrary frames rates...hm? |
13th August 2014, 06:58 | #10 | Link |
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They should be able to get rid of 24000/1001 and 30000/1001 and use the native 24 and 30 fps can't they?
I do think things are moving towards displays handling 50 and 60hz. The few tv's I've tried in ntsc land can be forced to 50hz but it doesn't switch to it when playing 25/50 fps sources unless instructed to. Do tv's sold in pal land switch to 60/120 without forcing it?
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13th August 2014, 09:44 | #11 | Link |
Life's clearer in 4K UHD
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It's a mandatory requirement for all Smart TV's sold within Europe to be 'multi-standard'.
The end-user does not have to fiddle with any settings. It's all done automatically
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13th August 2014, 22:23 | #12 | Link |
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That's good, here PAL BD/DVD's play at 60hz with judder. Custom resolution needs to be set to get 50hz. The judder is minimal compared to what happens with 60fps on a 50hz display though.
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13th August 2014, 22:42 | #13 | Link | |
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Quote:
The one outstanding film where it's really terrible is Star Wars Attack of the Clones. The scene where Obi Wan is introduced to the clones (the all white scenery scenes where they walk through the hall) looks full of judder here, when the camera slowly moves through the whole scene. It's really terrible |
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18th August 2014, 12:03 | #14 | Link | |
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18th August 2014, 19:06 | #16 | Link | |
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In fact, this appears a common problem in all LCD TVs so manufacturers have invented various techniques to try and reduce such judder/blur. |
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