"kmayur" wrote:if somebody from Roku replied, i think fair answer would be "nunya business"
1) How does video rendering happens in Roku? Does it use double buffering logic? Is there any difference in rendering logic for 4K OR 60fps compare to other resolutions/fps?
2) Do I need to provide any extra parameters/flags to player if the stream is 4K OR 60fps?Try first - ask if it doesn't work. (Welcome to Roku world!)
3) As I mentioned, the sample application uses "roImageCanvas" for user interface. I am not sure whether the player also uses it internally for rendering. In SDK documents, I found "roScreen" component which is used in gaming application and there is an optional flag to enable double buffering. Can I use "roScreen" with player? Will replacing "roImageCanvas" with "roScreen" help to render @ 60fps?No, roScreen will not change your streaming vs roImageCanvas. Video rendering is done on a different plane, which is underneath (z-order) these two.
"EnTerr" wrote:"kmayur" wrote:if somebody from Roku replied, i think fair answer would be "nunya business"
1) How does video rendering happens in Roku? Does it use double buffering logic? Is there any difference in rendering logic for 4K OR 60fps compare to other resolutions/fps?![]()
Video player keeps multiple decoded frames at a time but that's not related to "double buffering logic".
2) Do I need to provide any extra parameters/flags to player if the stream is 4K OR 60fps?Try first - ask if it doesn't work. (Welcome to Roku world!)
Yeah. Even I thought so. But I was not sure about it. Thank you3) As I mentioned, the sample application uses "roImageCanvas" for user interface. I am not sure whether the player also uses it internally for rendering. In SDK documents, I found "roScreen" component which is used in gaming application and there is an optional flag to enable double buffering. Can I use "roScreen" with player? Will replacing "roImageCanvas" with "roScreen" help to render @ 60fps?No, roScreen will not change your streaming vs roImageCanvas. Video rendering is done on a different plane, which is underneath (z-order) these two.
"kmayur" wrote:
I know that the app developer has no control over rendering buffers. I asked this question because I am observing tearing issue with 4K @ 60fps stream. I thought decoder might be writing to a buffer which is in rendering process. I wanted to know if that is the cause for tearing artifacts.
"EnTerr" wrote:
Can you take/show picture or video of it happening?
(picture is worth a thousand words, they say)
"RokuMarkn" wrote:
What do you have selected under Settings > Display Type?
--Mark
"EnTerr" wrote:
Apparently VSYNC issue. And shot in the dark - i suspect due to adaptive V-sync
(e.g. Roku4 decoded frame rate drops below sync rate), see viewtopic.php?f=34&t=54513#p490795
"EnTerr" wrote:
Can you provide the Co a URL to a sample video that causes the effect?