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…

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…

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?

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…

With my Amazon Fire stick TV 4k Max (which supports hevc playback) the problem remains, even if activate HEVC Encoding. The only way for me to get this works on every devices with every file is to desactivate tone mapping … Some Asustor NAS works perfectly with hardware transcoding with Plex, and A…

I believe most of you have heard about Synology’s reversal of HDD restrictions. Hope they can do it for the HW transcoding. sidetrack: saw this on Reddit. Not sure if it’s safe for DSM7.3 Reddit - The heart of the internet

We discussed this solution here: https://www.synoforum.com/threads/225-or-425-owners-plex-hw-transcoding.15094/page-4 It also works on DSM 7.3, as well as on 7.2.2. The only limitation concerns tone mapping on 2160p videos, which unfortunately causes a crash when attempting hardware transcoding (s…

Synology DS425+ hardware transcoding issue

Plex Media Server

ChuckPa October 3, 2025, 11:47pm 117

Yes. It means the kernel build is not correct for HW transcoding access in all modes.

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Synology DS425+ hardware transcoding issue

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