Problem with some 4K x265 mkv files buffering and then stopping

[nibbles]

@dextose

Is that helpful, and what can I do to fix it?

Definitely helpful. The higher bitrate film seems to be giving you problems.
Are you sending the data to the TV over WiFi?

The topic below is really good for wrapping your mind around the reqs.

[INFO] Plex, 4k, transcoding, and you - aka the rules of 4k

NOTE: for 2022 – Plex has come a long way since this FAQ was originally written, HW transcoding has become more available and more stable, and tone mapping was recently added to address the hdr/sdr color conversion issues. The first 4 ‘rules’ generally are no longer as important as they once were, but may still be a good thing to bear in mind. Dolby Vision, is an entirely other mess. THIS thread/FAQ is NOT about DV. DV work is still in progress, and there are no perfect TV’s or external devic…

The more details you give us about your hardware, network, media, the more the 4K people can help you get there.