I don't mind if I have to pre-transcode chunks of my library, Handbrake has a good batch interface and I can just leave it running for a few hours or days on my workstation if needed (I download files to my desktop so I can vet them for quality and subtitles before synchronizing them to my libraries on the Pi). I also tried using Handbrake to pre-transcode the video file, but honestly, I have no idea what I'm doing with that. But for what it's worth, I went through the motions of adding the Jellyfin user to the video group and selecting V4L2 from the dropdown. I do see all the warnings on that page, so maybe I'm just barking up the wrong tree. I started following this guide from 4 years ago, but stopped when I realized that OpenMAX is no longer supported on the Pi. Hardware acceleration is enabled on the Jellyfin Pi. I observed the system performance through htop and all four cores hover at 80 - 100% when trying to play these problematic videos. When I try to play, it does the play/freeze/play/freeze/etc. The most egregious is a 8GB copy of Nausicaa of the Valley of the Wind, filename " Nausicaa of the Valley of the Wind (1984) ". I used mediainfo to interrogate some of the problem files. On others, the video will play for 3 - 5 seconds, freeze for 3 - 5 seconds, then repeat. They all share the same behavior: On certain videos there will be very degraded quality. My clients are an LG TV with the Jellyfin app, a Samsung Galaxy Note 20 Ultra using the integrated player, and the web player in Firefox on Windows 10. However, I am getting some serious stuttering and quality issues across various videos. On the Raspberry Pi site itself, it just says "4k video playback". I finally snagged a RPi400 from Adafruit, where they specifically advertise it as having " 4kp60 HEVC decode ".
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