Server Version#: 1.41.9.9961-72009961 Player Version#: Client version 2025.20.0 (966828434) Hello, I’ve already exchanged a little with ChuckPa (thanks to him) about my problem, but I prefer to create a new thread so as not to pollute the other thread. I have a Synology DS425+, with the latest ve…

Great! It seems to work much better this way! There are two settings for HEVC encoding: for the first, I have the choice between: “never” (but it doesn’t work here), “HEVC videos only” (it does!), or “always.” Do you also recommend checking “Enable HEVC optimization (experimental)”? I tested it on …

‘HVEC Sources Only’ is generally the best option for Transcoding, especially as intel Quicksync really shines at AVC transcoding, so you wouldn’t want to transcode AVC media to HVEC (‘Always’ setting), it would just result in higher CPU usage. I don’t think the Optimization setting affects on the f…

Another video: [How To FIX Hardware Transcoding on Synology DS225+ & DS425+ NAS *Graphics Drivers SOLVED*] So, this is the same working method that we have been talking about?

Yep same fix, it’s just been compiled into a script.

I spent a lot of time testing my DS425+ with the appropriate drivers for hardware transcoding. I ran tests with 9 video files of varying resolution and bitrate on various clients: a Samsung Galaxy S25 smartphone (5G connection), a Samsung Galaxy Tab A7 tablet, an Amazon Firestick TV 4K Max connected…

For me so far I haven’t found an issue with 4k on multiple devices (phones, multiple laptops, TV’s) I don’t have a firestick or similar to try unfortunately. HW Transcoding has always triggered.

@EZTutty , @jingloon , @ChuckPa , after spending a lot of time testing the new drivers for the DS425+ with different clients, and comparing it with the behavior of my i9 13900k as a Plex server, here’s what I get: [image] As you can see, hardware transcoding doesn’t trigger for UHD files with a reso…

[image] Plichtao: @ChuckPa , does this specific issue ring a bell? Because without tone mapping, the colors appear very bland. Yes. It means the kernel build is not correct for HW transcoding access in all modes.

I see now that you are transcoding from hevc to h264. I haven’t been getting these issues as all my clients support hevc playback. When i disable HEVC Encoding i do see the same issue with Tone Mapping not allowing HW Transcode. at the point HW Transcode fails dmesg shows [994490.949451] i915 0…

Synology DS425+ hardware transcoding issue

Plex Media Server

jingloon October 1, 2025, 9:00am 114

From the way you describe, it seems we need to depend on the client, (the device that plays the video) being powerful enough to play 4K video?

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Synology DS425+ hardware transcoding issue

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