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YokaTV KB2 Review – Amlogic S912 TV Box with 32 GB Flash

December 15th, 2016 Leave a comment Go to comments

CNXSoft: This is another review by Karl about Amlogic S912 based YokaTV KB2 TV box.

Introduction

Today we will be looking at Videostrong YokaTV KB2. Below are the specs from Videostrong website.

yokatv-kb2-specifications

This is my first S912 device so I had high expectation. I have been using it for quite some time now with no major issues. I received approximately 6 OTA updates since I started testing and some welcome updates have come.

yokatv-kb2-package

yokatv-kb2-remote-control-power-supply

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Build

When I receive a box first thing I do is take it apart and check out the inside. I was excited when I found out it had 32 gig of storage. It is not too common.

yokatv-kb2-bottom-case

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Then when I opened the box I was really happy to see an antenna that wasn’t soldered on. Makes it easy to add a different one. +1 for KB2. Then I noticed the heat sink. It seemed a little small. I was right, it runs warm.

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Simple Mod

First thing to do: get this baby running cooler. When stressing the box, the temperature got over 80+°C a couple times. It ran between 70 and 75 °C on average before the mod. The case is mostly plastic except the bottom cover. Bingo! A couple squares of 5mm thermal pads between the board and the bottom of the case and thermal issues are gone.

yokatv-kb2-thermal-hack

I started SetCPU and ran the built-in stress test, it tops out around 72 °C, and quickly cools after stopping the test. I put a square approximately where the CPU is and while I had it open, where the memory is although I don’t think it is necessary. After the mod, the box runs about 60 deg Celsius.

Antutu

For this test I use SetCPU to set the Min and Max frequency for the CPU to 1.5 GHz which is the max for this processor. It will give the best score.

yokatv-kb2-antutu

Network Test

I am not sure why my WiFi was slow on the tests below. I don’t have an AC access point yet. The best I have is N, maybe that is the cause. Some friends over on Freaktab are getting some really good speeds on AC with this box. I might have damaged something when I opened the box.

Below are the results but take them with a grain of salt. I do a simple file transfer test of a large movie with optimum conditions for WiFi then one in more real world scenario.  

5ghz 3ft from NAS to internal SD

kb2-5ghz-wifi-nas-to-flash

2.4ghz 3ft from NAS to internal SD

kb2-2-4ghz-wifi-nas-to-flash

Gigabit Ethernet from NAS to internal SD (This is as fast as my NAS can transfer)

kb2-gbe-nas-to-flash

Next is more real world where AP’s have more obstruction.

5ghz 30ft from NAS to internal SD

kb2-5ghz-wifi-nas-to-flash-30feet2.4ghz 30ft from NAS to internal SD

kb2-2-4ghz-wifi-nas-to-flash-30feetSome More Benchmarks and Info

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Apps

I’ve used several apps and only Netflix and Direct Now had some issues:

  • Sling TV
  • Netflix (SD) – Stopped working after updating the app
  • Kodi
  • Chrome – Chrome works really well. I open a bunch of heavy URL’s and it performs excellent. Nothing scientific here. Go to several sites that I visit daily and I felt no lag.
  • Plex
  • Emby
  • HDHomeRun
  • Crackle
  • DirectTV Now – Worked with some hacking
  • Player-MediaCenter App – I will admit it has been a while since I tested out this app. It acts as a DLNA receiver and Airplay receiver. I didn’t have much luck in the past but I tested on my one Apple device the screen mirroring worked.

At some point Netflix stopped working. Keep getting few seconds of video then error 0013 “Sorry, we could not reach the Netflix service….” Not sure if it is Netflix update or box update that caused the issue. I went back and did some more testing to narrow the issue down. If I reverted back to the Netflix that came pre-installed I had no issue.

DirectTV Now is a new service in the US. With some persistence I was able to get it running. Video wasn’t perfect but neither was it on any devices I tested. It was surprising that it plays better on KB2 then Nvidia Shield. It is mostly watchable but stutters some. It is new so hopefully ATT will get this fixed soon. I had to do a couple things to get it working. After Googleing and a lot of experimenting I used 2 apps from play store: Hide My Root and Fake GPS. I also had to make 2 build.prop changes: ro.build.type=userdebug to ro.build.type=user and ro.build.tags=test-keys to ro.build.tags=release-keys. I tried on a couple different boxes after figuring this out and seems to work universally.

Remote Control

The remote is big but there is a built in app that is pretty convenient. There are 4 color coded buttons on the remote that you can customize to launch the apps that you want through an app on the box. There is also a dedicated app button that brings up a listing of all the apps. Everything else is pretty standard. You can also program the remote to turn your TV on and off through a learning feature. But alas I still prefer either an air mouse or touchpad with full keyboard.

yokatv-kb2-remote-control-configuration

Status Bar

Thank the gods…there is an option to turn the navigation buttons at the bottom of the screen off and on in Android settings…It is about a 50/50 split for people that like them and those that don’t. This was the first box that I have tested that gives the user an option.

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Audio Passthrough

All the below tests worked. I set Android to SPDIF. I tested with latest SPMC 16.4.2 and Kodi 16.1. Turned on pass-through DTS and AC3 and all the videos below worked with no clipping. I have a 5.1 system. If I didn’t have the AC3 ticked I would get no audio on some. First box with 100% working that I have tested on stock firmware.

yokatv-kb2-kodi-audio-pass-through-settings audio-file-list-dts-dolby-truehd4K Video

4k testing went well. I was able to play all videos smoothly with one player or another that it was supposed to play. Below are the test results. This box does not play 4k H.264 video @ 60fps per sec, so stutter is expected. Kodi and derivatives play best with amcodec turned off. The box ships with Kodi 17 beta but since it is beta, it is not very stable. I uninstalled it, and tested with Kodi 16.1 from the Play Store instead. I am not sure why 4k 8bit H.265 works better with amcodec turned on. I found the same results on S905x boxes. For the testing, I wanted to find the best overall solution and that is Kodi with amcodec turned off.

Test File Name With Amcodec Without Amcodec MX Player
23.976fps (in MP4) GoPro Epic Russian Wingsuit in 4K good
24fps (in MP4) SPRING 4K (ULTRA HD) good
25fps (in MP4) Burj Khalifa Pinnacle BASE Jump – 4K good
29.970fps, 51Mbps (hdmkv’s iPhone 6S 4K clip) iphone6s_4k good
59.940fps (in MKV) samsung_seven_wonders_of_the_world_china_uhd-DWEU wont play stutter stutter
60fps (in MP4) COSTA RICA IN 4K 60fps (ULTRA HD) w Freefly Movi wont play good
H264, up to 30fps Sony_Alpha_7R_II_video-test-4K good
H264, 50-60fps linkin_park_ultra-hd wont play stutter stutter
H265 8bit, up to 30fps LG_4K_View-the-Feeling good stutter good
H265 10bit, up to 30fps Samsung_UHD_Dubai good
H265 10bit, 50-60fps Samsung_UHD_7Wonders_of_the_World_Italy good
UltraHD HDR 10bit HEVC, 24fps Exodus_UHD_HDR_Exodus_draft good
VP9 The Curvature of Earth 4K 60FPS good not as good best

Alternate Firmware

Super Celeron has put together a nice modification of the latest stock firmware from 11/23. He cleaned up the firmware and made some adjustments to boot to bring idle down to about 1% and got auto frame rate switch working. See full changelog.

So to get 100% working pass-through and auto frame rate switching after installing the firmware above, as well as SPMC version 16.5.2. Codec acceleration is a little muddy at times. 4K files work best with amcodec off, and anything less work best with amcodec on. Below are my settings.

yokatv-kb2-custom-firmware-automatic-frame-rate-switching yokatv-kb2-custom-firmware-audio-pass-through yokatv-kb2-custom-firmware-video-codecsConclusion

I had this box for a while now and used it as my main box and it has performed really well. Consistent updates from Videostrong is much needed in the box world. I hope it continues. Gigabit Ethernet performed really well. Pass-through working 100% is fantastic and will make a lot of people happy. Video support in Kodi is really good. VP9 support is not 100% but MX player gives everyone an option if they have movies in that format.

I would like to thank Videostrong for sending a review sample. YokaTV KB2 can be purchased on Gearbest, Geekbuying, and Aliexpress for about $68.

  1. December 15th, 2016 at 14:20 | #1

    I’ve noticed all Amlogic S905X/S912 TV boxes I’ve reviewed have quite poor 802.11n performance, and for some of them 802.11ac is not that much better.

    Scale MB/s

  2. maurer
    December 15th, 2016 at 14:48 | #2

    finally a remote with play,pause stop buttons !

  3. December 15th, 2016 at 15:11 | #3

    Yes good box and thank you to vidstrong for the sample in October HK fair, this box will be getting my attention for custom rom as mention last week

  4. Winston
    December 16th, 2016 at 00:58 | #4

    Not really about this specific box, but a general question. I don’t like the MP3 player in Kodi nor do I like the other MP3 player in my MQX Pro box because neither makes navigation to find a particular MP3 within my large collection as easy as it SHOULD be.

    I want the ability to see alphabetic letter (A, B, C, etc.) directories on-screen for both artist and album names to dig down to a specific song. Select the letter and you see a list of albums or artists with that first letter in their name. Open one of those folders and select a specific album. Play the entire album or select the album’s directory, see all of the songs in it, and select one or more songs from it to play.

    The current navigation methods of even “best rated” free Android music players absolutely suck and, in many cases, are designed for touch screen navigation and not for Android box remote control. One of them, “Phonograph” stalls for long periods as, I think, it reads the directory on my MP3 thumb drive, a problem that the supplied MQX Pro apps don’t have.

    Any suggestions?

  5. Theguyuk
    December 16th, 2016 at 02:38 | #5

    Funny enough I only opened my s912 box today been sat here nearly 3 week, updated firmware and installed Netflix, only widevine L3

    Plays fine, iPlayer BBC plays fine to also Kodi Jarvis short test and plays fine.

    Alfawise s92

  6. Karl Johnson
    December 17th, 2016 at 07:58 | #6

    Superceleron told me how to fix the auto frame rate fix. If you want to stick with stick firmware you can use this app

    http://freaktab.com/forum/tv-player-support/allwinner-tv-players/freaktab-tools-utulities-collection/616600-auto-frame-rate-fix-apk-on-s905x-and-s912-firmware

  7. Qazwer
    December 17th, 2016 at 17:28 | #7

    @cnxsoft
    I have tested a Eny EM92 box with S912 on 802.11n and my results are way better. About 38 Mbps download

  8. December 17th, 2016 at 17:33 | #8

    @Qazwer
    OK, but how does it compare to your other devices? You can’t really compare numbers from different sources since the conditions are different.

    Edit: OK, since Karl tested at 1 meters from the router (~21 Mbps), your results still look much better.

  9. NIPSZX
    December 30th, 2016 at 04:43 | #9

    Does this box (or any others) have a power up button/power down button? I still have yet to find a box capable of powering up and down from remote.

  10. December 30th, 2016 at 09:22 | #10

    @NIPSZX
    All TV boxes come with a remote including a power button, and most can be turned on and off from the remote control.
    Usually the problem is when you use you own air mouse, in which case you can’t turn on the device with it. The solution is to get an air mouse with IR learning function, or alternatively get HDMI CEC to work.

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