It allows you to play all the popular audio and video formats and even some rare formats. This Codec Pack is a user-friendly solution for playing all your movie files. Codecs and DirectShow filters are needed for encoding and decoding (playing) audio and video formats. But the problem is that it didn't seem to make much of a difference.K-Lite Mega Codec Pack is a collection of codecs, DirectShow filters and tools. 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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