Frequently buffering when transcoding

[Gokuh306 0]

This is a fresh setup on a raspberry pi 3 B+. Bullseye no longer supports OMX and V4L2 doesn't seem to be working. I am having issues with buffering on Roku on videos that use ASS subtitles because it has to transcode them in, since Roku doesn't support them natively. I tried switching the transcoding folder to the external HDD because I just have a cheap microsd in the pi that has decent read speed but very slow write speed, and did not see any improvement. If I change any other settings from the defaults, the media doesn't load at all. Am I stuck getting SRT subtitles, or is there something I'm missing?

[Luke 42078]

Hi there, can we please look at an example?

Thanks !