Make sure you have the option "Show Extended Playback Info" enabled in the settings. Once that is done it will show in the video player OSD what is happening.
Also, please use the Emby Beta app for Roku. When you see an issue use the playback menu (3 sliders like a graphic equalizer shown on the OSD) and choose "Playback Correction" and it might solve the issue. If this doesn't try to change quality in the playback menu to something lower.
If nothing solves the issue this is likely a firmware error with Roku. I can't think of any reason (in the app) why it would stutter. It might also be environmental and something in how the Roku is either set up (poor wifi maybe?) or perhaps its something bigger.
Do you have some of these videos you could share with us? I am always interested in new samples for the test library. Especially samples that expose firmware errors on Roku models. Please if you can put these on dropbox and post a link to them. While I don't have a Streaming Stick+ ATM I can buy one to test with and diagnose your issue. I only have a roku3 and roku ultra as test models presently.
Wow- the stuttering problem is solved with Beta app. Although playback correction doesn't seem to help or change anything, changing the quality from Auto (80mbps) to 480 at 4mbps gets rid of stutter completely; since the test file I was using is 480 resolution, quality isn't really affected. I will try the same thing on a higher res files and see if the same is true there.
I'm assuming from that result that I should probably look at how my network is setup. My wifi is extremely strong (Roku is only 10 feet from the router), but the server PC uses a netgear powerline network extender that should run at close to gigabit speed in theory- but I do wonder if that's contributing to the problem. It doesn't explain the laptop (on wifi) working correctly through the web app, but I can't think of anything else unusual or odd about how it's configured that might impact emby in any way.
I don't have a dropbox account now, but I'll look into that this week; I'll happily post several files to use as test subjects once I do.
Thanks so much for all the help, I really appreciate it!
(edited to add more after trying several more files...)
I turned on 'show extended playback info', and now I get a slightly different result when I press 'playback correction'- I now get "Playback Correction (REMUX)", after pressing that, I then get "Playback Correction (TRANSCODE). After pressing the second time, the file will play correctly and without stutter- but at a noticeably lower resolution, despite the quality option being unchanged from Auto (80Mbps). I have several I've tried now with basically that same result- the 1080 files play without stutter, but at what looks like 480 resolution.
Edited by bsharp914, 10 December 2018 - 09:51 PM.