# Observing tearing artifacts on Roku-4 with 4k @ 60fps HEVC stream **URL:** \ **Category:** Archived\ **Tags:** roku-developer-program\ **Created:** [August 9, 2016, 6:27am UTC](https://forum.developer.roku.com/t/observing-tearing-artifacts-on-roku-4-with-4k-60fps-hevc-stream/7292 "2016-08-09T06:27:37Z")\ **Posts on this page:** 1\ **Page:** 2
**Author:** ![kmayur](https://avatars.discourse-cdn.com/v4/letter/k/6de8d8/32.png) [@kmayur](https://forum.developer.roku.com/u/kmayur)\ **Post date:** [November 18, 2016, 12:09pm UTC](https://forum.developer.roku.com/t/observing-tearing-artifacts-on-roku-4-with-4k-60fps-hevc-stream/7292/21 "2016-11-18T12:09:57Z")
. I conducted some more experiments and made the following observations. 1. As you know, Roku4 has two 4K configurations under _Settings \> Display type_. **(a) 4K UHD TV (10-bit)**: In this mode, [GetVideoMode](https://sdkdocs.roku.com/display/sdkdoc/ifDeviceInfo#ifDeviceInfo-GetVideoMode()asString) returns 2160p30. Also call to [CanPlay4K()](https://sdkdocs.roku.com/display/sdkdoc/Video+Encoding+Guidelines#VideoEncodingGuidelines-UHDVideoContentCapabilityCheckExample) prints “HDCP version too low”. I didn’t find a way to check current HDCP version so I called IsHdcpActive() with [standard HDCP version](https://en.wikipedia.org/wiki/High-bandwidth_Digital_Content_Protection#Versions)s. I found that my Roku’s HDCP version is 1.4. **(b) 4K UHD TV**: In this mode, GetVideoMode() returns 2160p60. Also call to CanPlay4K() prints "HDCP 2.2 check passed: ". 2. I have a 4K-UHD-10bit HDR @60fps HLS stream with HEVC video codec stored on a local server. I played this stream using “customvideoplayer” with both the display types. **(a) 4K UHD TV (10-bit)**: Video was played at 4K resolution but at around 30fps. Also, the video had tearing issues. **(b) 4K UHD TV**: Video was played at 4K@60fps. But video quality was not good. It could be because I played 10-bit video in 8-bit configuration. 3. I converted this 4K-UHD-10bit HDR @60fps HLS stream to MP4 and stored it on the same server. I played it using “customvideoplayer” with both the display types. **(a) 4K UHD TV (10-bit)**: Video was played @60fps but in a lower resolution. It appeared as if Roku was re-sizing a 1080p video for 4K display. I set Display Type to 1080p HD TV and played the same video. The video quality appeared to be the same. **(b) 4K UHD TV**: Video was played at 4K@60fps. But video quality was not good. It could be because I played 10-bit video in 8-bit configuration. 4. I copied the MP4 file to a pen-drive. I connected the pen-drive to the Roku and played this content using [roku-media-player](https://channelstore.roku.com/details/2213/roku-media-player) with both the display types. My observations in this experiment are same as MP4 playback using “customvideoplayer”. Based on the above observations, I have some questions. 1. As per my understanding, HDCP is related to Hardware+Software media pipeline from media receiver to rendering. In observation#1, I am not able to understand how and why changing display type is affecting the HDCP version. 2. From observation#2, #3 and #4, my conclusion is that, Roku supports 4K-10bit @30fps and 4K-8bit @60fps. (a) Is this the case? (b) If yes, are there any reasons for that? (c) If 4K-10bit@60fps media is in MP4 format, Roku appears to be re-sizing video to 1080p and playing @60fps. If the media is in HLS format, it appears to be playing at same resolution and frame-rate and failing due to some limitations. Why is there a difference in behavior? Is Roku using different profiles/media engines for MP4 and HLS? 3. I checked [GetVideoMode()](https://sdkdocs.roku.com/display/sdkdoc/ifDeviceInfo#ifDeviceInfo-GetVideoMode()asString) and found that there are some strings for 10-bit display (Ex: 2160p30b10, 2160p60b10). I don’t understand why I am not getting this output even when I set _Display type_ to _4K UHD TV (10-bit)_. The following are my Roku4 specifications. Model: 4400X - Roku 4 Software version: version 7.5.0 - build 4096-17 I am using Samsung flat smart TV. Model Code: UA55KS7000 Please let me know if you need any other information. Regards, Mayur K [Previous page](https://forum.developer.roku.com/t/observing-tearing-artifacts-on-roku-4-with-4k-60fps-hevc-stream/7292.md?page=1)