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For most Jellyfin users, the best starting point is a NAS with an Intel processor that includes Quick Sync Video (QSV), not a CPU-only appliance. The four-bay TerraMaster F4-425 is the more flexible build because it uses an Intel Celeron N5095, advertises hardware transcoding up to 4K (4096 × 2160) at 60 FPS, and leaves more room for storage and RAID expansion. The two-bay F2-425 uses the same processor class and video specification for smaller libraries. Neither datasheet establishes a guaranteed number of simultaneous Jellyfin streams, so treat those figures as hardware capability claims rather than benchmarks.
Before buying, confirm that the NAS operating system can run a current Jellyfin package or container, expose the Intel render device (usually through /dev/dri), and provide the permissions and drivers needed for hardware acceleration. A capable video engine is more important than a high CPU core count when 4K conversion is the requirement.
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What 4K transcoding actually requires
Jellyfin can either send a media file unchanged to a client (direct play) or convert it while it is being watched (transcoding). Direct play is the least demanding path: the television, streaming box, phone, browser or game console decodes the original file. Transcoding starts when that client cannot decode the codec, the stream’s bitrate is too high for the connection, subtitles have to be burned into the picture, or the server must convert HDR or Dolby Vision for a display that cannot handle it.
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A transcode is a pipeline rather than a single operation. It can include decoding, deinterlacing, scaling, HDR or Dolby Vision tone-mapping, subtitle burn-in and re-encoding. A NAS that handles simple H.264 conversion may struggle when the same film requires 4K HEVC 10-bit decoding, tone-mapping and a new encode at the same time.
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For a new library, HEVC/H.265 is the preferred storage format for 4K 10-bit, HDR and Dolby Vision video. It saves space compared with many older encodes, but it also makes hardware support more important because some clients cannot decode HEVC and will trigger a server-side conversion.
Which video engines Jellyfin can use
Jellyfin supports several hardware-acceleration paths. The practical choice depends on which engine the exact NAS processor or graphics card exposes and whether the NAS operating system allows Jellyfin to access it.
| Engine | Where it is commonly found | What to verify |
|---|---|---|
| Intel Quick Sync Video (QSV) | Intel processors with integrated graphics | The exact CPU must include an iGPU; processors with an F suffix do not. |
| NVIDIA NVDEC/NVENC | Discrete NVIDIA GPUs and some mobile parts | Check the codec matrix for the exact GPU. Low-end or mobile models may lack the required decode or encode support. |
| AMD AMF | Supported AMD integrated or discrete graphics | Confirm driver and operating-system support on the NAS. |
| VA-API | Linux graphics stacks, including some Intel and AMD hardware | Verify that Jellyfin can open the correct render device and that the driver is installed. |
| Apple VideoToolbox | Apple hardware | Relevant only when the server itself runs on compatible Apple hardware. |
| Rockchip RKMPP | Some ARM-based systems | Support depends on the specific SoC, kernel and NAS software. |
Jellyfin’s hardware-selection guidance warns that relying on the CPU alone is not recommended because video transcoding is very demanding. A modern CPU can still perform software conversion for an occasional stream, but it is the wrong basis for a NAS expected to handle 4K conversion reliably.
Why Intel Quick Sync is the safest NAS default
QSV is integrated into the processor, so it does not require a separate expansion card, additional PCIe power or a large cooling solution. Newer Intel integrated GPUs can handle multiple 4K HDR HEVC 10-bit transcodes in suitable configurations. That statement is a capability description, not a universal stream count: NAS firmware, memory, thermal limits, subtitle processing, tone-mapping and the client’s requested output all affect the result.
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When comparing Intel systems, check the exact model number rather than assuming that every Core or Celeron chip has the same media blocks. Avoid Intel models ending in F; those processors lack integrated graphics and therefore cannot provide QSV.
When a discrete NVIDIA GPU makes sense
NVDEC and NVENC are the principal discrete-GPU alternative. Jellyfin documents headless NVIDIA operation on Windows and Linux and supports hardware HDR and Dolby Vision tone-mapping on supported cards. The word supported matters: consult the codec matrix for the precise GPU, because some entry-level and mobile parts do not provide the decode or encode features required by a particular 4K file.
A GPU can be useful when the NAS has a compatible expansion slot, the operating system supports the driver, and you need more media capability than the integrated processor provides. It also adds cost, power draw, heat and configuration work. A GPU that cannot be passed through to a container or that lacks the required driver is no help to Jellyfin.
Best NAS candidates for a Jellyfin build
| NAS | Bays | Processor | Advertised hardware-transcoding specification | Best fit | Important qualification |
|---|---|---|---|---|---|
| TerraMaster F4-425 | 4 | Intel Celeron N5095 | H.264, H.265, MPEG-4 and VC-1; up to 4K (4096 × 2160) at 60 FPS | Libraries that need more capacity, RAID flexibility and expansion headroom | The specification is from the 2025 datasheet, not an independent Jellyfin benchmark. Confirm container or package support and GPU-device access. |
| TerraMaster F2-425 | 2 | Intel Celeron N5095 class | Hardware transcoding for the same listed codecs; up to 4K (4096 × 2160) at 60 FPS | Smaller libraries, fewer drives and a simpler two-disk build | The two bays limit capacity and expansion compared with the F4-425. The datasheet does not promise a Jellyfin stream count. |
TerraMaster F4-425: the better all-round enclosure
The F4-425 is the stronger default when you are building a long-term media server. Four bays let you install more raw capacity and create a RAID layout with more room for growth than a two-bay system. Its N5095 provides Intel integrated graphics, and the manufacturer lists hardware conversion for H.264, H.265, MPEG-4 and VC-1 at a maximum resolution of 4096 × 2160 and 60 FPS.
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Those numbers describe the enclosure’s advertised media capability, not the number of Jellyfin sessions it will sustain. A 4K HEVC file that direct-plays is a very different workload from a 4K HDR file that must be decoded, tone-mapped, have subtitles burned in and encoded for a browser. Verify that the NAS software exposes QSV or the Linux render device before committing to the build.
TerraMaster F2-425: the compact option
The F2-425 uses the same Intel Celeron N5095 class and lists the same 4K (4096 × 2160), 60-FPS hardware-transcoding ceiling. It is appropriate when the library is small, the budget favors two drives, or a second NAS will handle backups. Its limitation is physical rather than video-related: two bays provide less capacity and less flexibility for expansion and RAID migration than four bays.
How many 4K streams can a NAS transcode?
There is no responsible universal number for either candidate. Jellyfin does not publish a stream-count guarantee that applies to every NAS, and the TerraMaster specifications do not constitute a standardized Jellyfin test. The practical limit depends on the source codec and bit depth, output codec, frame rate, HDR or Dolby Vision tone-mapping, subtitle behavior, deinterlacing, client compatibility, memory pressure, storage throughput and network conditions.
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Use the advertised 4K/60-FPS figure to confirm that the video engine is aimed at this class of media, not to promise four, eight or any other fixed number of viewers. Test with the files and clients you actually use:
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- Install Jellyfin using a package or container supported by the NAS operating system.
- Enable the appropriate hardware-acceleration method in Dashboard → Playback → Transcoding.
- Grant the service account access to the Intel render device, commonly
/dev/drion Linux, or to the passed-through GPU when using an NVIDIA card. - Play a representative 4K HEVC 10-bit file on each important client. Test direct play first, then force a lower resolution or incompatible codec to create a transcode.
- Repeat with HDR or Dolby Vision material and with subtitles enabled. Watch Jellyfin’s playback information and the NAS resource view to confirm that the hardware engine, rather than only the CPU, is doing the work.
- Add sessions one at a time until playback begins to buffer or the server cannot maintain real-time conversion. Record the file, client, subtitle mode and tone-mapping setting alongside the result.
This method gives you a useful number for your own library without presenting an unverified laboratory figure as a product guarantee.
Pre-purchase checklist: verify the NAS software, not just the chip
Prebuilt NAS appliances can make third-party software installation difficult. A processor with QSV is not enough if the vendor’s operating system hides the media device or blocks the required container permissions.
- Jellyfin availability: Confirm a current native package or a supported container image for the exact NAS OS version.
- Device access: Check that the system can expose the Intel render node, usually through
/dev/dri, or pass through an NVIDIA GPU to the container. - Drivers and permissions: Verify that the kernel graphics driver is present and that the Jellyfin service account belongs to the group allowed to open the render device.
- Acceleration controls: Make sure the Jellyfin interface exposes QSV, VA-API, NVDEC/NVENC or the relevant method instead of silently falling back to software conversion.
- HDR handling: Confirm that the chosen engine and driver support tone-mapping for your HDR and Dolby Vision files.
- Memory and CPU headroom: Leave capacity for metadata scans, downloads, backups and other services; transcoding is not the only workload on a NAS.
- Network and clients: Check the NAS link speed and the clients’ direct-play support. A client that can decode the original file avoids a needless transcode.
Storage, RAID and network decisions
Choose bays according to growth, not only today’s library
Two bays can be adequate for a modest collection, but expansion usually means replacing disks with larger ones or attaching separate storage. Four bays provide more combinations of capacity and redundancy and make it easier to add space without redesigning the entire server. RAID improves availability; it is not a backup, so keep an independent copy of irreplaceable media and configuration data.
Budget for NAS-rated disks and the usable capacity
Compare the total build cost, including NAS-rated hard drives, rather than comparing empty enclosures. Usable capacity is lower than the sum of the disk labels once a redundant RAID layout and filesystem overhead are accounted for. A larger library may justify the four-bay chassis even when the processor and video engine are identical.
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Match the network to direct play
4K files can have high and variable bitrates. Wired connections are preferable for a fixed television or media player, while Wi-Fi quality depends on distance, interference and the client’s radio. If the client can direct-play the original HEVC stream, the NAS mainly reads and serves the file; if the connection cannot sustain that bitrate, Jellyfin may transcode and place additional load on the video engine.
Common failure modes and fixes
Jellyfin shows software transcoding
Check the selected acceleration method under Dashboard → Playback → Transcoding, then verify the render-device path and service permissions. On an Intel system, confirm that the processor is not an F-suffix model and that the graphics driver is loaded. In a container, device access must be explicitly passed through; installing Jellyfin alone does not grant it.
Playback buffers during HDR or Dolby Vision conversion
Tone-mapping adds decode, color conversion and encode work. Confirm that the GPU and driver support the required HDR path, then test a direct-play-capable client. Subtitles that require burn-in can also turn an otherwise simple stream into a full video transcode.
A file plays on one client but not another
That is normal when clients have different codec, profile, bitrate or subtitle support. Record which client triggered the conversion and test its direct-play settings. Prefer a client that can decode the library’s HEVC format when practical; otherwise ensure the NAS engine supports the required input and output codecs.
The GPU is installed but Jellyfin cannot use it
Check the exact GPU’s NVDEC/NVENC support, install the matching driver, and confirm that the operating system and container can see the card. A low-end or mobile GPU may lack a codec feature that the application needs even though the device appears in the system.
Which NAS should you buy?
| Your priority | Best direction | Reason |
|---|---|---|
| Four-drive capacity and future expansion | TerraMaster F4-425 | Four bays plus an Intel N5095-class QSV-capable platform and the listed 4K/60-FPS hardware-transcoding support. |
| Small library and lower enclosure complexity | TerraMaster F2-425 | It retains the same processor class and advertised video ceiling while using two bays. |
| More demanding conversion or advanced tone-mapping | A NAS or server with a supported discrete GPU | NVIDIA NVDEC/NVENC can be appropriate when the exact GPU, driver and passthrough path are verified. |
| Mostly compatible clients and direct play | Either candidate, chosen by storage needs | When clients decode the originals, the server avoids much of the transcoding workload. |
The F4-425 is the safer general recommendation because storage growth is harder to solve later than an unused bay is to ignore. Choose the F2-425 when two disks genuinely cover the library and you have accepted the smaller expansion path. In both cases, the purchase is successful only after the NAS OS, Jellyfin installation method and hardware-device access have been confirmed for the exact software versions you will run.
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