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Xiaomi Yi 4K Action topic
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  • trevmartrevmar

    Hmm. Well, I was right to be wary about Yi changing the 2.5K mode 2560x1520 to 2.7K 2704x1520. The new mode covers less sensor width than the old (at least in Medium, stabilized,lens corrected). The B-roll shoot I did last week, which came out adequately well, would have been pretty poor with the reduced width of the new mode from firmware 1.2.3, so I downgraded to v1.1.0. The good news is that you seem to be able to freely upgrade and downgrade the firmware without having to jump through hoops. FWIW, here are the changes to the 1.2.3 version,as taken from the Beta testing group posts:

    • Added 2.7K resolution and removed 2.5K resolution
    • Added manual adjustment functions when in time-lapse video mode, like ISO, WB, EV etc
    • Added long exposure option for timelapse photo mode, supports more time interval etc
    • Added “Open LOG” (Settings-About, when on “About” interface, fast tap 3 times will activate LOG)
    • Changed "1080 Ultra 120 FPS" to "1080 Ultra 90 FPS" and supports Auto Low Light
    • Changed "4K Ultra 25FPS/30FPS" to "4K Ultra 24FPS"
    • Improved FOV effect when in Ultra mode
    • Improved SD card SanDisk U3 II compatibility
    • Improved Bluetooth stability
    • Improved Wi-Fi stability by choosing respective country
    • Improved “Time-lapse photo” effect
    • Improved App stability
    • Improved camera system stability
    • Fixed broken graph, ghosting and abnormal timestamp display in video file when shooting in 2.7K/60FPS mode

    ( http://forum.xiaoyi.com/forum.php?mod=viewthread&tid=37937&extra=page=1 )

  • Vitaliy_KiselevVitaliy_Kiselev

    @trevmar

    Chinese and Korean firms are mad with all this VR stuff.

    Making lots of cheap plastic things to mount lots of cameras, the more - the better.

    I think idea here is to keep very high resolution.

  • trevmartrevmar

    Fascinating structure from Photokina, Vitaliy. I wouldn't have thought they needed 12 cameras, but maybe this setup was using some custom 2.5K-like mode...

    I used my Yi4K at an event in Moscow last week, and it worked perfectly (with v1.1 firmware in the 2.5M stabilized, linearized, mode). I am nervous about upgrading to the v1.2.3 firmware, with its changes to give the 2.7M mode, so I ordered a second Yi 4K to use as the "testing-mule". Will be interested to test the new 4K extra-ultra 24fps mode, too. Not sure why they are now claiming better auto-low-light, will look into that.

  • Vitaliy_KiselevVitaliy_Kiselev

    Lots of them at Photokina

    image

    img2550.jpg
    800 x 533 - 44K
  • TailschaoTailschao

    Pretty positive.

  • MikeLinnMikeLinn

    Yi 4K Action Cam vs GoPro Hero4 Black

  • Vitaliy_KiselevVitaliy_Kiselev

    Another review

    https://geektimes.ru/company/gearbest/blog/280174/

  • trevmartrevmar

    v1.10 firmware upgrade is nice. FOV option is interesting in 2.5K, the mode I am using most. Narrower view seems to give better image stabilization (probably because of extra sensor pixels not in use). HHL, Have you seen any documentation explaining exactly what the sharpness and FOV actually do? A map of the sensor-pixels vs video pixels is the least one could expect, I think. It would be nice to have a description of the "flat color" mode too. As far as I can see, Xiaomi's documentation is non-existent. Luckily, the camera "just works."

    For an f2.8 lens, the camera's ability to work in the dark is excellent! The automatic noise reduction does lose some pixels of resolution, but not many.

  • MikeLinnMikeLinn

    Samples

    v1.10 firmware released

    • Added Sharpness option
    • Added FOV option
    • Added List of Recommended microSD Cards
    • Added Video Time Info
    • Fixed bug: Lens Distortion Correction Mode
    • Improved Image Detail Display in the Dark
    • Improved Flat Color Display
    • Improved APP reliability
    • Improved System reliability
  • HHLHHL

  • TailschaoTailschao

    So, flat mode is not much useful?

  • trevmartrevmar

    OK, a few more test clips helped me to see there is insignificant dynamic range improvement with "FLAT," primarily just changes in gamma and saturation. It is no Protune competitor.

    Errors and omissions excepted, of course :)

  • trevmartrevmar

    I have been asleep since GoPro3, so playing with the new Yi 4K today was fun. No compression on the audio, I prefer to do that in post anyway. I especially like the hardware lens geometry correction. At 2560 x 1920 the stabilization works, and the geometry correction. I am still playing with the FLAT recording mode. My first thought was "It is not as good as Protune" but then I realized that the "YiColor" normal mode, with which I was comparing it, actually already does a pretty good job with greys without needing the flat mode. Will need to shoot a few jobs to figure out how much is possible in post, 8 bits is certainly limiting. Otherwise it seems great. Works as advertised.

  • MikeLinnMikeLinn

  • IronFilmIronFilm

    @markr041, the Yi developers are rather active in pushing forward the firmware with this camera and proactively seeking feedback :) Already released a new firmware update for it!

  • markr041markr041

    Well, at least we will get the mini BOSS - since it's out. I thought those Ambarella 4k 60p sensor/chips were announced quite some time ago - in January. And I expect Gopro will use them. And maybe Samsung will surprise us.

  • Vitaliy_KiselevVitaliy_Kiselev

    @mark041

    One big issue with progress is to get proper main LSI. Ambarella already announced proper good thing with support of 4K 60fps HEVC, but as in previous times it can be good delay before actual product. Sony is almost exclusive supplier of 4K high speed sensors and issues with factory are still present.

  • markr041markr041

    I am looking forward within the next six months to new features that will improve my videos, including good stabilization and 4K 60p. In 6 months all outdated technology products will be cheaper, including this one.

  • IronFilmIronFilm

    "I do not see anything innovative here"

    What is innovative here is... the price. The price. THE PRICE!! :D Looking forward to an even further price drop in six months.

  • TailschaoTailschao

    They do not distribute beta outside Facebook.

  • bannedindvbannedindv

    could someone please mirror the firmware link? I don't use facebook and I think you have to be a facebook member for access...

  • Vitaliy_KiselevVitaliy_Kiselev

    New beta firmware for Yi 4K have flat color profile, can be obtained at

    https://www.facebook.com/groups/838989242858914/

  • Vitaliy_KiselevVitaliy_Kiselev

    Yes, big thanks.

    It is very good system. Best stabilizer amount all camcorders.

    Only gimbal can compete.

  • markr041markr041

    Well, here is the Google translation of what Sony says:

    "Even moving the camera body, float in space the optical unit of the lens and the sensor as an integral, are mounted on the Handycam of Sony "space optical camera shake correction". It was equipped with newly developed ultra-small size of this unique technology for the action cam. In addition, we realized the blur no stable recording than conventional by tuning the correction capability for the action cam. Such as a bicycle or drive, you can also stable image is to reduce camera shake and blurring the scene blur occurs. This overwhelming shake correction function, users can be working in 4K shooting and high-speed recording." [emphasis mine]

    And here is the link to that page, with a diagram of what is going on.

    http://www.sony.jp/actioncam/products/FDR-X3000/feature_2.html

    Seems like free-floating sensor/lens to me, just like BOSS. And that it works in 4K (which for sure it says it does)suggests that it is purely optical/mechanical - no digital at all.

  • Vitaliy_KiselevVitaliy_Kiselev

    @markr041

    Are you sure? As BOSS is gimbal like stabilization in their video line.

    Most probably it is juts optical and electronic stabilization.

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