I originally posted this in the x9s v2.0.5 firmware thread, as I originally owned the x9s, but I was asked by several users to create separate threads highlighting some of the more serious issues with these players, to bring it to Zidoo's attention. Now that I own the x10, I see this player suffers from all the same issues as the x9s. There's a wealth of information on these issues in these 2 threads for the x9s: http://forum.zidoo.tv/index.php?threads/new-firmware-v2-0-5-version-beta-for-zidoo-x9s-release.7401/ http://forum.zidoo.tv/index.php?threads/ycbcr-444-vs-ycbcr-422-why-the-difference.7216/ So here goes: Stuttering & other issues Linked to from the kodi wiki samples page: 1920x1080 50.000 AVC .mkv https://drive.google.com/file/d/0BwxFVkl63-lEbFBzak1sbmU1N0E/view Doesn't play - screen goes black, no audio, but you can bring up the navigation bar and it seems to be advancing (TV's native media player plays it fine) Linked to from the kodi wiki samples page: https://www.dropbox.com/sh/6iy4gxgsfn14opq/AAAK_L1M_NwZwBPb5IkEPh7Ga?dl=0 Hi10 Anime samples Doesn't play - screen goes black, no audio, but you can bring up the navigation bar and it seems to be advancing Linked to from the kodi wiki samples page: https://www.koi-sama.net/files/hi10/ Hi10 Anime samples (header stripping) "Can't Play Video." All 5 of these clips play with a solid grey bar on the bottom of the video: (TV's native media player plays them all fine) 4096x2160 HEVC 24.000 .mp4 http://www.imaging-resource.com/PRODS/samsung-nx1/FULLRES/yvid_SAM_0161-C4K_Sample.MP4 4096x2160 HEVC 24.000 .mp4 http://www.imaging-resource.com/PRODS/samsung-nx1/FULLRES/yvid_SAM_0164-C4K_Sample2.MP4 3840x2160 HEVC 29.970 .mp4 http://imaging-resource.com/PRODS/samsung-nx1/FULLRES/yvid_SAM_0235-UHD_Sample1.MP4 3840x2160 HEVC 29.970 .mp4 http://www.imaging-resource.com/PRODS/samsung-nx1/FULLRES/yvid_SAM_0231-HQQuality.MP4 3840x2160 HEVC 29.970 .mp4 http://www.imaging-resource.com/PRODS/samsung-nx1/FULLRES/yvid_SAM_0230-ProQuality.MP4 VP9 - (HDMI AUTO/Switch Frame rate and resolution) Eye of the Storm 4K Ultra HD.mkv (Youtube) (3840x2026 (1:895) 24.000 VP9 (OPUS audio) .mkv) Stuttering, No Audio, Player info reads 0 fps (TV's native media player also has same issues) No stutter issues with the HEVC demos I tried, but AVC had serious stutter issues, making them unwatchable, especially in the 29.970 frame rate. For those files, I tried "Switch frame rate and resolution" (which sent out 2160p/29.970), and also manually forced 2160p/30.00 and 2160p/60.000. In all cases the files still stuttered. AVC - Stutters badly (HDMI AUTO/Switch Frame rate and resolution) TV's native media player plays them fine ------ 29.970 - 4K_AUO.mp4 (3840x2160 29.970 AVC 92.7 Mb/s) - Hisense_The-amazing-beauty-of-the-planet_large.mp4 (3840x2160 29.970 AVC 89.3 Mb/s) - LG Cities By Night 4K Demo.mp4 (3840x2160 29.970 AVC 45.1 Mb/s) - Panasonic Marvelous World 4K Demo.m2ts (3840x2160 29.970 AVC 119 Mb/s) - Samsung_UHD_demo_2013.mp4 (3840x2160 29.970 AVC 48.8 Mb/s) - Samsung_UHD_demo_Iceland.mpeg (3840x2160 29.970 AVC 49.2 Mb/s) - Sharp_4K_Italia_Parasols.mp4 (3840x2160 29.970 AVC 73.0 Mb/s) - Skyworth_4K_Jiuzhaigou.mp4 (3840x2160 29.970 AVC 96.5 Mb/s) - TCL_-_Four_Basic_Colors.mp4 (3840x2160 29.970 AVC 79.8 Mb/s) 60.000 - bbb_sunflower_2160p_60fps_normal.mp4 (3840x2160 60.000 AVC 8,488 kb/s) Variable (Zidoo Player info reads 30 fps) - Panasonic_-_The_World_Heritage_of_Cambodia.m2ts (3840x2160 Variable AVC 110 Mb/s) - Panasonic_4K_Hokkaido_and_Tokyo.m2ts (3840x2160 Variable AVC 112 Mb/s) AVC - No stutter (HDMI AUTO/Switch Frame rate and resolution) ------ 29.970 - Sony_Demo_Bravia_4K_2014.mp4 (3840x2160 29.970 AVC 12.1 Mb/s) - LG_4K_UHD_Music_Video_AOA_Miniskirt.mp4 (3840x2160 29.970 AVC 20.7 Mb/s) - Panasonic Perfume 4K Demo.mkv (3840x2160 29.970 AVC 39.7 Mb/s) 30.000 - bbb_sunflower_2160p_30fps_normal.mp4 (3840x2160 30.000 AVC 7,981 kb/s) - LG_4K_UHD_Music_Video_Apink_Mr_Chu.mp4 (3840x2160 30.000 AVC 21.3 Mb/s) - LG_4K_UHD_Music_Video_Hyomin_Nice_Body.mp4 (3840x2160 30.000 AVC 21.4 Mb/s) - LG_4K_UHD_Music_Video_T_Ara_Number_Nine.mp4 (3840x2160 30.000 AVC 20.9 Mb/s) - Mandelbrot Set Standart Zoom. 10^33 in 4K [3840x2160 - No Sound].mp4 Youtube (3840x2160 30.000 AVC 16.6 Mb/s) 25.000 - CanalPlus_4K_Demo.mp4 (3840x2160 25.000 AVC 33.2 Mb/s) 23.976 - LG Europe 4K Demo.mp4 (3840x2160 23.976 AVC 125 Mb/s) - Samsung_UHD_Cityscape.mp4 (3840x2160 23.976 AVC 43.1 Mb/s) - Sony Alpha 7R 2 4K Demo.mp4 (3840x2160 23.976 AVC 98.4 Mb/s) - Sony The Fountains Of Bellagio 4K Demo.mkv (3840x2160 23.976 AVC 47.1 Mb/s) - UHD 4K Sony FDR-AX1 2160p.mpeg (3840x2160 23.976 AVC 50.3 Mb/s) 29.917 - LG Greece and Norway 4k Demo.mp4 (3840x2160 29.917 AVC 33.4 Mb/s) HEVC - No stutter (HDMI AUTO/Switch Frame rate and resolution) -------- 3840x2160 23.976 HEVC .ts 51.4 Mb/s 3840x2160 24.000 HEVC .mp4 38.5 Mb/s 3840x2160 25.000 HEVC .ts 51.4 Mb/s 3840x2160 29.970 HEVC .mp4 24.9 Mb/s - 46.8 Mb/s 3840x2160 29.970 HEVC .ts 31.0 Mb/s - 51.4 Mb/s 3840x2160 30.000 HEVC .ts 23.8 Mb/s - 51.4 Mb/s 3840x2160 50.000 HEVC .ts 16.2 Mb/s - 45.8Mb/s 3840x2160 50.000 HEVC .mkv 24.7 Mb/s 3840x2160 50.000 HEVC .mp4 61.7 Mb/s 3840x2160 59.940 HEVC .mp4 77.4 Mb/s 3840x2160 59.940 HEVC .ts 31.1 Mb/s - 51.6Mb/s Why does the Zidoo player have such stutter issues particularly with so many AVC 29.970 files? Is it another frame rate issue with the player or is it the AVC codec at higher bitrates for some reason? I played the Jellyfish demo http://jell.yfish.us/at 400 Mb/s and it played fine, so bitrate shouldn't be an issue.