April 21, 2014, 06:00:29 AM

Author Topic: Why not higher resolution video?  (Read 7196 times)

Tristan944

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Why not higher resolution video?
« on: April 25, 2013, 11:51:04 PM »
High definition video is approximately 2 megapixels. Most of Canon SLRs are 18 megapixels or more. 4k video is 8.3 megapixels. Why don't all the current body's feature 4k or higher video resolution?
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Why not higher resolution video?
« on: April 25, 2013, 11:51:04 PM »

pdirestajr

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Re: Why not higher resolution video?
« Reply #1 on: April 26, 2013, 12:39:07 AM »
I'm not a tech guy, but just think about how many fps your average DSLR shoots stills, then think about how many are needed for video..
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ahab1372

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Re: Why not higher resolution video?
« Reply #2 on: April 26, 2013, 12:40:42 AM »
Because it is not trivial to process the larger amounts of data per second. Processors need to be fast enough and be able to dissipate the heat.

Tristan944

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Re: Why not higher resolution video?
« Reply #3 on: April 26, 2013, 01:06:49 AM »
Because it is not trivial to process the larger amounts of data per second. Processors need to be fast enough and be able to dissipate the heat.

I can see that, but the new GoPro does 4k.
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rs

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Re: Why not higher resolution video?
« Reply #4 on: April 26, 2013, 01:11:04 AM »
All the reasons above, plus how many people have TV's which are 4k or above? How any TV stations can broadcast at such resolutions?

While 4k might become mainstream at some time, it is pushing the boundaries at the moment, so not many cameras record it, and not many monitors/TV's can display it.

Ps - the new GoPro does 4k at just 15fps - no where near fast enough to create the illusion of smooth video.
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ahab1372

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Re: Why not higher resolution video?
« Reply #5 on: April 26, 2013, 01:22:16 AM »
Because it is not trivial to process the larger amounts of data per second. Processors need to be fast enough and be able to dissipate the heat.

I can see that, but the new GoPro does 4k.
True, but I don't think it takes 18MP stills. I'm not an engineer, but often you have to optimize for one or the other. Both at the same time is difficult.

dr croubie

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Re: Why not higher resolution video?
« Reply #6 on: April 26, 2013, 01:22:58 AM »
Filpside: Why higher resolution video?

Am I the only one still using a CRT TV bought new (by my parents) in 1986? I watch it so seldomly, and with only half-attention when I do, that any expense on buying a new one is pointless. Money better spent on lenses, film, and travelling to photogenic spots.
Maybe if there were something worth watching on TV nowadays, I'd be inclined to watch it more. Even if they're already broadcasting in 1080p, it might be technically 'better' than an analogue TV, but the stories sure as hell aren't. And even if the stories were worth watching, how much do more pixels add to the plot?

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Re: Why not higher resolution video?
« Reply #6 on: April 26, 2013, 01:22:58 AM »

Jesse

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Re: Why not higher resolution video?
« Reply #7 on: April 26, 2013, 01:39:27 AM »
Get a 1DC if you want that. It's only $15k.
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Lawliet

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Re: Why not higher resolution video?
« Reply #8 on: April 26, 2013, 02:07:51 AM »
Why don't all the current body's feature 4k or higher video resolution?
4k@30fps are ~250MP/s, or about the same rate as 18MP at 14fps. Coincidently the max. framerate as the still frame counterpart to the 1Dc manages. Which in turn is the fastest still cam you can buy.

Rienzphotoz

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Re: Why not higher resolution video?
« Reply #9 on: April 26, 2013, 02:41:59 AM »
    High definition video is approximately 2 megapixels. Most of Canon SLRs are 18 megapixels or more. 4k video is 8.3 megapixels. Why don't all the current body's feature 4k or higher video resolution?
    a. AFAIK there are no TV's that can play "18 megapixels or more" video resolution
    b. The processing power required for shooting "18 megapixels or more" video resolution will be so huge that it would:
    • cost a fortue
    • the camera would probably have to be massive in size and weight
    Simply put it is not economically viable for manufacturers to produce such a camera.[/list]
    « Last Edit: April 26, 2013, 03:46:04 AM by Rienzphotoz »
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    Nishi Drew

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    Re: Why not higher resolution video?
    « Reply #10 on: April 26, 2013, 02:48:35 AM »
    There's still major stations broadcasting at upscaled 720P, and considering how TVs have gotten massive and a lot more affordable, simultaneously a vast majority have migrated to portable devices that one can't even perceive HD on. Yes Pixel density counts but even 720P I think is overkill for handheld devices. But that doesn't stop the world from wanting 4K, and speaking of broadcast, Japan's NHK is working on 8K cameras!
    Though more resolution really begins to make sense when it comes to editing, higher bit rates and better color spaces all help with grading and creating an image you like, but for cropping or any fine edits the higher the resolution the better indeed. Then again, did more MPs in our photographic cameras mean much? At that point where it became more than enough (when we broke 10MP?) it's not like anyone's pictures got that much better, yeah there's more detail and you can print a lot larger, even save a too-far shot by cropping more and more.

    For now it's a big boys game where full out production companies can show off their muscle of 4K against the poor indie film shooters who can't go past 1080P when on a budget, like when 3D was all the rage (haha what on earth happened to all that?) it was meant to be a feature that only Hollywood & friends could touch so would protect them, and the marketing gets them back enough anyways, like all the views an incredibly boring video gets just because it has a 4K tag

    Rienzphotoz

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    Re: Why not higher resolution video?
    « Reply #11 on: April 26, 2013, 02:54:48 AM »
    I can see that, but the new GoPro does 4k.
    Because Go Pro Hero 3 can only shoot 4K video at 15 fps
    The sensor size of Go Pro Hero 3 is a puny 1/2.3" ... now compare that with a cropped frame 18 MP DSLR sensor size which is  22.3 x 14.9 mm 
    « Last Edit: April 26, 2013, 03:00:13 AM by Rienzphotoz »
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    Rienzphotoz

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    Re: Why not higher resolution video?
    « Reply #12 on: April 26, 2013, 03:11:46 AM »
    I can see that, but the new GoPro does 4k.
    Because Go Pro Hero 3 can only shoot 4K video at 15 fps
    The sensor size of Go Pro Hero 3 is a puny 1/2.3" ... now compare that with a cropped frame 18 MP DSLR sensor size which is  22.3 x 14.9 mm
    Just to put sensor sizes in perspective see the below pic for comparison between the Go Pro 3 sensor size and an 18 MP DSLR sensor (as well as the full frame) ... now think of the processing power & costs required to make an 18 MP DSLR do 4K video let alone 8K or higher:
    « Last Edit: April 26, 2013, 03:13:18 AM by Rienzphotoz »
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    Re: Why not higher resolution video?
    « Reply #12 on: April 26, 2013, 03:11:46 AM »

    Canon-F1

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    Re: Why not higher resolution video?
    « Reply #13 on: April 26, 2013, 03:38:32 AM »
    High definition video is approximately 2 megapixels. Most of Canon SLRs are 18 megapixels or more. 4k video is 8.3 megapixels. Why don't all the current body's feature 4k or higher video resolution?

    4k it´s pretty useless for most and would make the cameras more expensive.


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    LostBoyNZ

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    Re: Why not higher resolution video?
    « Reply #14 on: April 26, 2013, 03:40:49 AM »
    Blackmagic Design recently announced a 4k camera for $4,000 with a Super 35 sized sensor (similar to APS-C sized) that has an EF mount:

    http://www.blackmagicdesign.com/products/blackmagicproductioncamera4k/

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    Re: Why not higher resolution video?
    « Reply #14 on: April 26, 2013, 03:40:49 AM »