I’ve almost completed my review of Videostrong K1 Plus Android box powered by Amlogic S905, and while there are many shortcomings, 4K video playback is actually pretty good with Android’s Video Player (Kodi is not really usable @ 4K).
I connected the device to LG 42UB820T 4K UHD TV, and set video output to 2160p @ 60Hz, and went through several video samples:
- Beauty_3840x2160_120fps_420_8bit_HEVC_MP4.mp4 (H.265 @ 30 fps – No audio) – OK
- big_buck_bunny_4k_H264_30fps.mp4 (H.264 @ 30 fps – MPEG1/2 and AC3 audio) – OK
- big_buck_bunny_4k_H264_60fps.mp4 (H.264 @ 60 fps – MPEG1/2 and AC3 audio) – Video looks somewhat OK, but big audio delay or AV sync issue.
- BT.2020.20140602.ts (H.265 Rec.2020 compliant – AAC audio) – OK (First time I can play this video on any hardware).
- Fifa_WorldCup2014_Uruguay-Colombia_4K-x265.mp4 (H.265 @ 60 fps – AC3) – Video is very good, but no audio
- MHD_2013_2160p_ShowReel_R_9000f_24fps_RMN_QP23_10b.mkv (10-bit HEVC @ 24 fps – no audio) – OK
- phfx_4KHD_VP9TestFootage.webm (VP9) – 3 to 4 fps (software decode)
- Samsung_UHD_Dubai_10-bit_HEVC_51.4Mbps.ts (10-bit HEVC / MPEG-4 AAC) – Perfect!
- Sintel.2010.4k.mkv (H.264 @ 24 fps – AC3) – Video OK but no audio
- Astra-11479_V_22000-Canal+ UHD Demo 42.6 Mbps bitrate.ts (10-bit H.265 from DVB-S2 stream) – Most of the time OK, but it will freeze and the same exact point every time for several seconds.
You can watch the tests in the video below.
I have to say I’m pretty pleased with 4K support on Amlogic S905 so far. 4K H.264 @ 60 fps and VP9 are simply not supported by the VPU in Amlogic S905 SoC, and the only problem I’ve seen with regards to video was with the DVB-S2 stream bug, which could be software or hardware, with the latter requiring a new silicon revision. Only time will tell. That’s not to say there’s still some work to be done, as DTS and Dolby are not supported in the device I tried, and if you are interested in Kodi, you’ll need to be a little more patient.
You can find links to the videos in the comment section of this list of video samples.