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YI 4K+ 4K 60fps camera official topic
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  • DrDaveDrDave

    Does it make a difference?

  • markr041markr041

    The Yi 4K+ is hacked. You can increase the bitrate, and the max and min bitrate ratios! Just an autoexec file on the sd card.

    https://github.com/irungentoo/Xiaomi_Yi_4k_Camera/tree/master/4k%2B

  • markr041markr041

  • markr041markr041

    Runners in Slow Motion

  • markr041markr041

  • markr041markr041

    Kid Fun and the Acela Express in 4K60P

    Note the dynamic range of the audio at the end, when the real train comes.

  • RRRillaRRRilla

    Now that I updated the camera to the latest firmware, the card (Samsung EVO+ 256GB) works fine.

  • markr041markr041

    @RRRilla Some people evidently just do not value resolution as much as others - EIS and distortion removal are resolution robbers. Note that in shooting at 2.7k and adjusting lens "distortion"' and shooting in medium fov you are just cropping the sensor; with both on it's not even clear you are getting the full 2.7K. You could shoot 4K 60p (with the Yi 4K+) and accomplish the same things in post, and you might have more flexibility in framing.

    The EIS is very limited in ability if you want to move with the camera. A gimbal does a better job and does not result in soft video. But it is less convenient. Just depends on whether you value real stability and high resolution over a little more compactness.

    And this video shows that there is a Samsung 256GB microsd card that works fine on the Yi 4K+, though maybe not the one you may have. I trust you have the latest Yi firmware - it has been updated numerous times, with special attention to card compatibility.

  • RRRillaRRRilla

    The only reason to buy the latest, more expensive yi 4k+ is it´s ability to shoot 4k in 60p.

    Just got it and I have few important negative things about it:

    In uhd/60p, you cannot use “adjust lens distortion,” without it the image is simply too distorted. In uhd/60p, the electronic image stabilization (EIS) cannot be used. In uhd/60p, when video quality is set to high, my Samsung EVO+ 256GB card is too slow to use.

    I will continue to shoot in 2.7k/60p with my older hacked yi 4k. With the card working, with EIS and lens distortion fix enabled.

  • markr041markr041

    On a gimbal with external mic.

  • Vitaliy_KiselevVitaliy_Kiselev

    Review

    image

    In video recording quality is impressively smooth and fluid. Shooting at 60fps while utilizing 4K makes the YI 4K+ stand out from others on the market, increasing its appeal to those who are towards the more professional end of the market. It should be noted that image stabilization is only available when shooting at 30fps, so you might want to mount the camera to a tripod or use it on a sturdy surface if recording at 60fps.

    Video samples

    http://www.photographyblog.com/reviews/yi_4k_plus_action_camera_review/

    s645.jpg
    800 x 536 - 87K
  • markr041markr041

    Yi 4K+ on a the Zhiyun Evolution gimbal at the end of the day. Can be viewed in 4K 60p.

  • markr041markr041

    Will do, soon.

  • Vitaliy_KiselevVitaliy_Kiselev

    @markr041

    Mark, can you write short opinion about Zhiyun Evolution gimbal? With video samples where you used it.

  • markr041markr041

    Thanks. For this video I did not use a gimbal since I was dipping the camera (with case) in the water; most shots used a monopod. Otherwise I use a Zhiyun Evolution gimbal.

  • olli66olli66

    @markr041 nice shots, nice colors, may I ask which gimbal you used?

  • markr041markr041

    In and around water.

  • markr041markr041

    My take(s) on and experience with the Yi 4K+:

    The Yi 4K+ uses a new processor. It has four advantages due to its being more powerful and more energy efficient:

    1. One can now shoot UHD (4K) video at 60 fps.
    2. One can shoot UHD at 30 fps with EIS that is very sophisticated.
    3. Battery life is longer.
    4. No overheating.

    Why do we care about 60 fps? Actually, I can never detect the difference between video shot at 30p and 60p. The key advantage is that you can slow down the video and still have 4K, using 30p as the rendered video.

    Why is slowing down useful? You can smooth out camera moves - it smooths out pans and, most importantly, smooths moving with the camera (on a gimbal) - and subject action slowed down makes that action more interesting.

    I decided to test out this new camera, taking advantage of its 60p in 4K. I had a gimbal, so I could move with the camera (it also produces motorized pans). To achieve the minimum weight (125 grams) for the gimbal (Feiyu Crane M) I put the camera in its waterproof case. So, I was going to shoot on the beach, temperature over 80 degrees (F) sealed in an airtight case! Will it overheat?

    The results:

    1. I shot for a period of 1 hour 31 minutes, never turning off the camera in the hot sun, until the battery ran out (first charge). This is longer than I have ever experienced with any small camera.

    2. I shot 50 minutes of 135 Mbps “footage” taking up 51 GBs on the micro sd card during that time.

    3. No overheating - again, the camera was on the whole time, and 55% of the time the camera was recording. No other small camera I have used (Sony RX100 IV, GoPro Hero 4 Black and Hero 5, Samsung 360 Gear, Kodak 360 4K) could do that, not even close. Now, overheating can shut the camera down or it can cook the sensor (hello, GoPro and Kodak and Samsung), resulting in low-resolution results. Neither happened.

    And here is the edited video, shot on the gimbal - with smooth slowed pans, and slowed moving with the camera and static shots, some slowed. You are seeing 4K (30p), a dynamic video and slow motion!

    Now, what about using the camera without a gimbal? How good is the EIS in 4K (30p) in eliminating shakes? Here is the 4K test video, all handheld (static shoots).

    Pretty amazing, and I do not see much loss (if any) in resolution. Handheld, 4K, tiny camera - better than the Sony BOSS.

  • olli66olli66

    got the camera today I like what I have seen so far 24fps, image stabilisation, the handling, a lovely cam now I just need ND filters for work outside which ones will fit? which ones you recommend?

  • LongJohnSilverLongJohnSilver

    It's a shame that after two iterations nobody makes a proper underwater housing +100m like this

    https://www.golemgear.com/p-730-gopro4-housing-for-gopro-hero4-camera-rated-to-500ft.aspx

  • eatstoomuchjameatstoomuchjam

    I may end up resorting to that if I can't find any info.

  • Vitaliy_KiselevVitaliy_Kiselev

    Can just generate file using simple script and try to dump very small areas like 32 bytes.

  • eatstoomuchjameatstoomuchjam

    My first attempt to dump memory last evening was a failure - I tried "savebin c:\dump.bin 0xA0000000 l 16777216" in autoexec.ash similar to what people did on older Xi cameras. The only result was that my camera locked up and I had to eject the battery to get it to turn off again.

    Sadly, I'm not having much luck finding info on memory locations for Ambarella H2.

  • olli66olli66

    any LUTs for this camera? the only negative I hear from people about this camera is the color shift. I ordered one by the way, should get it any day

  • eatstoomuchjameatstoomuchjam

    The Prime Day deal was good enough for me to finally buy one of these as my first action cam.

    I've been poking around a little and I haven't found anybody who has made an autoexec.ash hack for it yet like with the standard 4k action camera - and I'm assuming (so far) that the memory locations are different since it's a different SoC, but I've at least been able to confirm (so far) that telnet can be enabled using the same trick as the 4k camera

    The next step will be figuring out how to decode the memory addresses - it might be possible to crank up the bitrate on this little guy in the pretty near future. :)

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