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[theguymadmax]

Code:

Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (eac3 (native) -> aac (libfdk_aac))
Press [q] to stop, [?] for help
[libx264 @ 0x55722e7bfa80] using SAR=1/1
[libx264 @ 0x55722e7bfa80] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x55722e7bfa80] profile High, level 5.1, 4:2:0, 8-bit

You don't have hardware acceleration setup, and your relying on your CPU. I don't have experience with TrueNAS so I can only refer you to the docs: https://jellyfin.org/docs/general/installation/truenas/

Someone else who has experience might be able to guide you further if have any questions on that.