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    Jellyfin Forum Support General Questions Lower transcoding Speed than expected?

     
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    Lower transcoding Speed than expected?

    Got a new Server setup, and for 4K content it seems to not give a very big performance boost.
    Antonbp5
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    #4
    2025-01-09, 05:49 PM (This post was last modified: 2025-01-09, 05:52 PM by Antonbp5.)
    (2025-01-09, 05:22 PM)TheDreadPirate Wrote: Your 4K video is HDR10.  Meaning that during a transcode it is also tone mapped.  Tone mapping is VRAM limited.  Since this is an iGPU it is using your system RAM and the RAM in your new setup is likely not that much faster than the old setup.

    Oh okay very cool. So it isn't actually the resolution, it is just the HDR10 part. Very cool. The performance is still good and very usable of course. Just found it odd, as my sources said it would be incredible performance.

    Thank you very much!

    (2025-01-09, 04:56 PM)bitmap Wrote: If I recall correctly, when transcoding an HDR video you will get HDR --> SDR, tonemapped by your CPU rather than the iGPU. This would explain the improvement (better CPU) but the lack of significantly higher performance (tonemapping happens w/ CPU, not GPU).

    ETA: My Arc A380 gets those numbers when encoding to AV1 and HWA with this card is a massive improvement over an iGPU.

    I just tested it and going from 0 sessions to 1 4K HDR session used 2 GB of Ram and CPU bumped to about 30%. So seems like a mix of of RAM and CPU. Very cool. Good thing I only own one 4K movie.

    Thank you very much.
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    Messages In This Thread
    Lower transcoding Speed than expected? - by Antonbp5 - 2025-01-09, 04:26 PM
    RE: Lower transcoding Speed than expected? - by bitmap - 2025-01-09, 04:56 PM
    RE: Lower transcoding Speed than expected? - by TheDreadPirate - 2025-01-09, 05:22 PM
    RE: Lower transcoding Speed than expected? - by Antonbp5 - 2025-01-09, 05:49 PM

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