Playing back 4K (UHD Ultra High Definition)

Discussion in 'CAMERA Models' FAQ' started by Troy, Mar 14, 2017.

  1. Troy

    Troy Administrator Staff Member

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    Playing back 4K (UHD Ultra High Definition)

    We now see 4K in lots of places. It's on a lot of consumer devices and entertainment appliances, and it is absolutely awesome.
    The caveat is that-- 4K content requires quite a lot of things to actually work and play smoothly. It's not exactly just plug and play.
    Well, at least for now that the technologies available to the masses is still transitioning.
    Having a 4K capable camera is just one side of the whole picture. And there are many sides to this.
    Let me list down the basics:

    1. True 4K or 4K-capable Camera. One has the capacity to record in full 4K resolution, the other is interpolated (mathematically guessing) to achieve the full 4K resolution. This part is obviously optional if we're talking about content played from the internet.

    2. Storage. Since 4K and 2K video files are huge. You will need a big one. Get the biggest you can get that works with your camera. With at least an 90MB/s Write speed. Or your card will struggle when the camera tries to write the file to it. Your camera will overheat and you will get erratic performance if your card cannot keep up with the 4K being written onto it. (This is also optional if you have the files streaming from the internet)

    3. Transport. USB cable, WiFi, DSL, Cable, Fiber, etc. You need one that's fast enough for moving that gargantuan file to keep the processing unit fed.
    Some people have reported that sometimes even 1080p 60 will be choppy when playing it on a computer while the actual file is in the camera, plugged in via USB version 1.0
    Yes, you read that right. Even USB has transfer speeds.

    4. Playback
    . This is your 4K TV's processing hardware, your laptop/desktop's graphics processor, tablet or smartphone's CPU and GPU. If you devices' processors are not ready for such huge processes when reading the file and then displaying it, then it will not work properly

    5. CODEC: It means Compressor-Decompressor, or Coder-Decoder, which is required to "read" how the digital file is formed.
    Your TV or computer or tablet does not know what the file contains, it needs a specific set of instructions on how to read it.
    If you do not have the correct CODEC on your device, you will need to install it so that playback does happen..
    For media player apps, just look for the app-specific codec files on the App Store or Google Play,

    6. Display. The actual screen where you watch the content on. When you already have everything, from the processor, the app, to the CODEC, but your screen resolution is too small, then you just can't expect too much.
    If you have a huge-a-- I mean... giant TV, capable of playing 4K UHD, you still have to move far away from it to watch your content. See what this implies?



    Now, given that the amount of data that a 4K video has is MASSIVE, think about it as a system.
    If one of these parts mentioned above is slowed down or faulty, your wonderful 4K video is going to stutter, get blocky, or just stop completely.

    People complain that it may be the camera's fault or the app, or the device, not realizing how important the other parts of the system is to show you that 4K video.

    So next time you shoot anything in 4K, think about how you intend to play them back later.
    And be sure that your options will run the now-state-of-the-art ultra high definition files.

    If you're recording in 4k, even in 2K, and scaling it down so it can upload faster on YouTube or Facebook, you may actually be missing the point.

    And about editing 4K footages, it gets a ton more complicated.
    You need a fast enough computer, a large hard drive, big and fast RAM, an updated video card, and a lot of patience.
    We can write about that here but that calls for an entirely different thread topic.

    Got anything to add? Post it below!
    :)
     
    EMRBondoc and TechTronic9000 like this.
  2. Mafk

    Mafk New Member

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    Can i use this sd card?
     
  3. Mafk

    Mafk New Member

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  4. Peter Loeskow

    Peter Loeskow New Member

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    Troy, you wrote "
    3. Transport.
    USB cable, WiFi, DSL, Cable, Fiber, etc. You need one that's fast enough for moving that gargantuan file to keep the processing unit fed.
    which begs this question from me:
    Does an SJ7 Star really send a 4K feed out through the mini/micro HDMI socket, or is it just a HD feed according to the in the menu chosen type of TV system (PAL or NTSC)?
    BTW, this is my first post, but I'll certainly become more active with my SJ7 once I get the 4K feed problem solved (I do have an UHD TV set), spring will come to Northern Europe and I can begin to also use my coming SJCAM gimbal.
    Greetings from Sweden
     
  5. Sulev Svilponis

    Sulev Svilponis Elite

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  6. Peter Loeskow

    Peter Loeskow New Member

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    Thanks, Sulev.
    This means that both a) and b) are theoretically possible, which is good news to me.
    I don't have the latest firmware installed in my SJ7, because in another topic, remarks were made about the heating of the device due to the processor's increased work load with that version.
    As I see it now, there needs to be an option in the software to allow for a), besides the "common" 1080p feed out to a TV screen (never mind the inferior composite video image).

    Perhaps I am writing this too hastily, and if so, I apologize already now, before I try tonight (again) to feed 4K from my SJ7 by HDMI cable to my 4K screen.
    I was fooled for years, assuming that JPEG images on an USB stick in the Smart TV set were displayed as 8 megapixel images (my main reason for purchasing it when I did !). Only a few months ago after probing Panasonic Support in Sweden did I learn, that not only was the internal media player only capable of delivering an1080-resolution video signal, but that the same goes for still images!
     
  7. Peter Loeskow

    Peter Loeskow New Member

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    Today I connected my SJ7 to my UHD-TV by an HDMI cable* for 4K.
    According to Panasonic support, the screen will display 8MP if the input is via HDMI. Today, the screen did not display about (I did not count them all) 8MP but apparantly only 2MP, like a regular HD vid, of what I shot in 4K-resolution today.
    This may take some time, but just as a firmware option was provided for digitally and physically connecting the SJCAM Gimbal to the SJ7 Star, there should be a choice of either HD PAL/NTSC (presently the only available output resolution) or UHD 4K.

    So how are the chances for that happening, Troy (or whoever in the know at SJCAM)?

    I gladly payed for a SICAM Gimbal this month, I'd rather avoid paying for yet another, 4K capable, stand-alone media player, and I most certainly donot want to pay for another, more recent UHD-TV.

    *(Again. This time using a 4K-suitable HDMI cable, albeit with an adapter at the SJ7 end)
     

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