Struggles with 4k with SRT in MKV, but external SRT runs fine on Smart Soundbar

Server Version#: 1.25.1.5286 (UnRaid)
Player Version#:6.9 build 12

This is an issue I discovered several months back. If I watched an episode with SRT in the MKV, it would take some time to start, which wasn’t major, once the show starts there’s no captions. When I extracted the SRT to an external file it loaded faster and worked just fine.

More recently, I was watching a different show. It also was in 4k, but when I started an episode it would take a long time to start, go a very short time, buffer again, go another short time, and then say an error I couldn’t reproduce. This time it played but didn’t show subs. Another episode gets to 13%, blank, 13%, blank and gives a Playback Error “Playback has stopped due to multiple playback errors. Please check your connection and try again.” If I switch to an external SRT, it runs fine.

Oddly I have gotten another show from another encoder that works fine with SRT in the MKV. I don’t know what the difference is, or what to look for.

I have an older 1080p TV, so I know I could find a 1080p version but I’d like to have access to this in the future when I have a better TV. I’m sure it’s something I messed up, either on the build, or in the settings, something somewhere.

If anyone knows right away what it is, awesome. If someone can point me to what I need to look at, or info to provide, I can do that too. I have a Nvidia video card, so I’m using that for HDR tonemapping. Thanks for your time.

James

Edit: I forgot to mention that if I play the same files from my phone (over local network) there’s little lag starting the show and captions work. That’s why I put this in the Roku as opposed to NAS.

Bumping this in the hopes that someone might have an idea where to start. If this goes 30 days without anything I’ll let it die.

I’m just trying to understand why .srt in the mkv file causes it to not show or to buffer and end while an external one is quick and fine. What to look for between files to have a smoother experience (if both are x265, 2160p, hdr, srt for example). Anyway, thanks to those who at least read through this.

James

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