Same issue of choppy playback here for MPEG4 SD videos on a Philips 55PUS6401 Android TV (Oreo 8.0). Using latest stable Plex client and latest PMS beta 1.15.0.659.
Is a fix on PMS-side possible to force transcode to H264 for these videos ? 
That would probably solve all playback issues with MPEG4 SD encoded videos.
I tried remuxing the avi file into an mkv file, same issue.
Movie XML info :
mpeg4sdmovie_xml.txt (13,6 Ko)
Android TV client logs :
androidtv_logs.txt (1,0 Mo)
SOLVED: I Have a Fix for the SD Stutter. Iâve been experiencing this on my Xbox One. It has to do with âAllow Display Mode Switchingâ in the video setting. Make sure this is unchecked and youâll be good to go!
Just tested, playback is still continuously stuttering 
So itâs only on SD? Hmmm⊠Iâm sorry. I really thought I had this figured out. Iâve been dealing with this for months and I finally took off the Auto Switching and itâs been stable ever since. From what I experienced early on with Plex (years ago) is that MP4s playback best. They were more stable than MKV or AVI so Iâd suggest using something like Handbrake to convert a test file to MP4. I also noticed on a few videos that were MP4 that didnât play nice, after I ran them through Handbrake they played fine. Donât overwrite the original file, just create a test file using a video converter like Handbrake and see what happens. Let us know.
I have only tested SD videos, which are essentially in AVI containers.
Of course if I re-encode them to H264 that will work, but the idea was to let PMS do it on the fly when played back on Android TV, since I have a few dozens of such MPEG4 SD videos.
I didnât realize that you didnât want to try re-encoding the videos. I canât speak to AVI video because the few that I had I converted to H264 years ago for compatibility across all platforms.
Just found this issue occurring on my new FireTV stick (Basic Edition) I bought. Happens on on 720p MPEG4 videos.
Thanks @jmoses for the idea of using the gear icon to change to âconvert automaticallyâ. It fixes it on a per video basis which works perfectly though I wish there was a global setting for that.
The other option that works was get Plex to âOptimizeâ the videos for TV on the server since that recodes them to H264. https://support.plex.tv/articles/213095317-creating-optimized-versions/
Has this issue been fixed yet? I am experiencing this on a fire stick and fire 4K box on a Samsung 4K tv. The plex app on the tv is fine however.
This DID solve it for me - but there was a caveat. I unchecked the setting in my PMS settings - but then saw on the troublesome client (a Android tablet-based headunit for me vehicle) there was a setting on that client app for the same thing âplay smaller files at original qualityâ. I unchecked that and viola! FINALLY. No idea why Plex would have an option in two places, and if so, that the PMS wouldnât rule⊠but - at least todayâs issue is solved for me.
Frustrating because this was one of the first things I did on the PMS end. Took me another month to figure out the other end.
Iâm still having issues with this on a Sony Bravia. Ended up reverting back to 6.12 again.
I canât understand that after 1.5 years this still isnât resolved.
Same here - still get the stuttering problems with a Sony Bravia also. Going back to 6.12 if I can. What I donât understand is that if it works on 6.12, how does it take so long to find the issue?
Looks like Plex is on itâs way out, for me at least. I canât update PMS from version 1.17 because the fix match doesnât do anything and Iâm left with unmatched or mismatched items with no way to fix them. Now I noticed that I canât update the firestick app from a 2 year old version because older SD video playback is unwatchable. Glad your online D movie streaming service is working!
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