Server Version#: My Synology’s latest version is: DSM 6.2.4-25556
Player Version#: My plex server version is: 1.23.5.4841-6000
Apolgize if I’m missing something, do let me know!
Long story short, whenever I watch certain movies, or tv shows I get a constant buffering, but I have other movies, with the same resolution where none of these issues happens. Is my Synology that bad, that it can’t even play such things? I even have a 4k video, that’s also in a state of buffering.
These bufferings are not permanent, after the buffering has been there, I can watch from 5-1 min of the file, and the buffering occurs again. It’s not my network that’s at fault, since I have 1000download and 500 upload, and my devices are on the local network.
There’s a load of factors that can cause the buffering…
Video bitrate vs. available network bandwidth
4K content comes in all sizes. If you have a high-quality encode with a high bitrate, that can easily go beyond the bandwidth of your network. Keep in mind… it comes down to the weakest link in your streaming setup – some TVs e.g. only provide a 100 Mbps LAN port (could be too slow for high quality 4K content). If you’re using a wireless connection, all kinds of environment factors can impact your ideal transfer speeds (down to walls, furniture, distance, competing WLANs in your neighborhood…).
Bad network setup
If the devices in your home network are in different subnets, the playback can be considered remote in which case remote playback restrictions could apply.
If bad goes worse, a bad remote access configuration could even result in that stream to go through a relay as the devices cannot establish a direct connection (even more limitations).
Incompatible formats → transcoding
As long as your client / playback device can play the 4K video as-is, you’re usually good.
Keep in mind there’s more elements than just the resolution… other factors can be the video codec, bitrate, encoding level, audio codecs, # of channels, subtitle formats…
If your client cannot deal with the file, your server will attempt to make it compatible (=transcoding).
When it comes to that, I’m sad to say your NAS is completely unprepared to deal with a 4K transcode. The CPU built into that device does not support Plex’ hardware accelerated transcoding and it’s only able to deal with low/average bitrate 1080p HD videos. No chance it’ll transcode a 4K video for you.
Other NAS models don’t have significantly more powerful CPUs… but the models with Intel CPUs can utilize the chip’s iGPU for hw transcoding.
Long story short…
For more details you’ll need to provide some more details on your setup – e.g. what client are you streaming with and some technical details about the file you’re trying to stream.
https://support.plex.tv/articles/201998867-investigate-media-information-and-formats/
Hello tom80H,
For starters I would like to thank you for your time and assistance, I will try to answer after best skills, since I unfortunately am not so in-depth with the terms that are being used when talking about bitrate, etc. So please bear with me. 
The file container itself, for the movie for an example is an MKV-file, the video codec is H.264
Audio after what I could find should be: EAC3 5.1 (correct me if im wrong)
subtitle format is PGS
Please let me know if I forgot something!
Best regards,
Nisani
Do you see the same buffering if you disable the PGS subtitles?
While some new clients are able to display those, this is not possible for all devices. PGS subtitles are basically individual pictures of that text that have to be displayed on-top of the media. If your client cannot handle that, the server will attempt to merge those images into the actual video frames (“burn-in”).
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