QNAP TVS-472XT NAS PLEX Media Server Transcoding 4K and 1080p Test featuring H.264 and H.265

Transcoding 4K Media on the QNAP TVS-472XT NAS Plex Media Server?

Transcoding on a NAS such as the QNAP TVS-472XT device is the ability for a multimedia file to be changed from it’s existing format or codec to one that is better suited to the destination device. In this file access, the QNAP TVS-472XT NAS is the host device and the device you want to play the file is the client. This is the case of whether you are using Plex or not. Transcoding is typically required when a media file is more recently released than the client device that is accessing it, so the newer compression or playback format is unknown to the device you want to access it with. Alternatively, you want to access the movie or music on your QNAP TVS-472XT and do not want to use the original file in its full size. Transcoding can enable you to stream a much smaller version in weight or resolution if needed. IN a popular program such as PLEX, smooth playback is essential, and with the plex media server application on the QNAP TVS-472XT NAS using a larger percentage of CPU and Memory than most programs, it is very useful to know the plex transcoding abilities of any NAS.

OFFICIALLY the Best NAS for A Plex Media Server of 2017

Why should you factor transcoding with a Plex Media Server on a QNAP TVS-472XT NAS

When you install a Plex Media Server on your QNAP TVS-472XT, you should know that plex is not the answer to all of your media prayers. It has some limitations and depending on the NAS you use, these limits can be annoying. You will most likely have media files in a large collection of different formats and there is no guaranteeing that these are going to be compatible with TVs, iPads and Smartphones that you wish to watch them on. Although you will have a version of the Plex app on the viewing device, that app will still be locked to playback the supported media types on that device.

So if your phone does not support.MKV or .MOV, then neither does the plex app you installed on it. However, this is where transcoding comes in again, as the plex media server will use the NAS system resources to change the file to a version/format that it CAN play. What makes transcoding with Plex different to ordinary transcoding is that often, the NAS (in this case, the QNAP TVS-472XT) will not let the plex use the transcoding engine inside. This is not the end of the world, as it will use raw system power instead. The result is that where a regular transcode outside of plex will use 20-30%, in plex it could go as high as 70-80%. This is why it is important to know how well a plex NAS will transcode, as if it will hapen regularly, it could potentially slow down the general use of your QNAP TVS-472XT NAS.

Which plex supported client devices require transcoding from the QNAP TVS-472XT NAS

Destination devices range greatly and are often referred to as the client device. Common client devices that your QNAP TVS-472XT device will be accessed by are often:

  • iPad or Android Tablet
  • iPhone or Android Smartphone
  • Smart TV or DLNA supported monitor
  • Macbook, Laptop or Netbook device
  • Sound systems such as Bose, Sonos and Sony DLNA systems
  • Home Theatre Systems
  • Network and internet-enabled gaming consoles such as PS4, Xbox One and Nvidia Shield

Transcoding between a QNAP TVS-472XT and your media can be of tremendous benefit for those with limited internet bandwidth, download limits or low powered devices whilst using the plex client application.

What are the Specifications of the QNAP TVS-472XT NAS?

The specifications for the QNAP TVS-472XT NAS are below and like all NAS devices, the CPU and Memory play a big part in how well it performs at transcoding both in and out of plex. The key factors to consider are if the device features an x86 or ARM-based CPU, does the QNAP TVS-472XT CPU feature a transcoding engine and how much RAM the device arrives with for multiple transcoding tasks. Below are the QNAP TVS-472XT specs:

NAS Model



Intel® Pentium® Gold G5400T

2-core 3.1 GHz processor

4 GB SODIMM DDR4 (2 x 2 GB)

Graphics: Intel® UHD Graphics 610

HDMI 2.0a

TB3 and 10Gbe


1080P Support: YES

4K Support: YES

Transcoding Support: YES


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What is the difference between H.264 and H.265 4K Media on a NAS

H.264 and H.265 are common codecs of modern digital media. H264 is also referred to as AVC by experts (Advanced Video Coding) and is considered the standard for video file compression. This allows for media originally created for large-scale entertainment to be recording, compressed, and distributed to the home and smaller scale production of digital video content watched by you, the consumer via plex.

H265 is the newer and more consumer-friendly alternative to H264. It is also known as HEVC (High-Efficiency Video Coding) and was developed in order resolve issues of enormous 4K media files being just too large for your client device to playback. H.265 has become so popular and data saving that chances are that the YouTube clip, iTunes media or iPlayer content you watched was in .265 and HEVC. Typically a modern NAS such as the QNAP TVS-472XT will playback with JUST H.265 or it will PLayback both H.264 and H.265. The latter pretty much being exclusive to x86 or AMD based NAS CPU devices.

The QNAP TVS-472XT NAS 4K H.265 8-bit 30fps 46Mb/s PLEX Test 1- How well does it perform?

We pushed the QNAP TVS-472XT NAS to transcode a 4K H265 media file through the plex media server application. It was an 8-bit recording, running at 30 frames per second and featured a bitrate of 46 megabits per second. The QNAP TVS-472XT playback results were:

The QNAP TVS-472XT NAS 4K H.265 8-bit 25fps 38Mb/s PLEX Test 2 – How well does it perform?

Next, we pushed the QNAP TVS-472XT NAS to transcode a 4K H265 media file through the plex media server application. It was an 8-bit recording, but this time running at 25 frames per second and featured a bitrate of just 38 megabits per second. The QNAP TVS-472XT playback results were:

The QNAP TVS-472XT NAS 4K H.265 10-bit 30fps 38Mb/s PLEX Test 7 – How well does it perform?

We then ran a much denser H.265 4K file on the QNAP TVS-472XT. This H265 file through the plex media server application was another 10-bit recording, at 30fps  but this time with a much higher bitrate of 38 megabits per second. The QNAP TVS-472XT playback results were:

The QNAP TVS-472XT NAS Ultra HD 4K H.264 8-bit 24fps 22Mb/s PLEX Test 15 – How well does it perform?

We then decided to end on an older and currently more common owned 4K type of media file. This was kind of our control tests for most NAS and was no exception for the QNAP TVS-472XT through the plex media server application. This UHD file in 4K was an 8-Bit file, arriving in 24 frames per second and at a bitrate of 22megabits per second. For those who have owned 4k media for a while and want to consider their older H264 material, this test would be of interest. The results were.

The QNAP TVS-472XT NAS 1080p H.264 8-bit 24fps 40Mb/s PLEX Test 17 – How well does it perform?

For test 17 we wanted to check that the file used in test 16 was not just a fluke, so we found the exact file, at the same frames per second, file format (mp4), in 1080p and in h.264 type – however this file was THREE TIMES the bitrate. So, the same as before but denser. We can then see a direct comparison between them and how bitrate effects plex media server transcoding on the QNAP TVS-472XT NAS.

The QNAP TVS-472XT NAS 4K H.265 10-bit 30fps 40Mb/s PLEX Test 18 – How well does it perform?

Satisfied with our testing 1080p, we decided to focus on 4K Media for this last three tests (Test 18, 19 and 20) as we wanted to introduce the same media file, but each time change just one variable, to see how the plex media server application on the QNAP TVS-472XT NAS coped. In all three tests we used a 10bit 4K H.265 Media file. But in test 18 we used the lowest bitrate, at 40Mb/s. Here is how PLEX on the ### transcoded.

The QNAP TVS-472XT NAS 4K H.265 10-bit 30fps 90Mb/s PLEX Test 19 – How well does it perform?

Next we took that exact media file and this time used a version that was more than double the bitrate than test 18 (90Mb/s > 40Mb/s). The results for plex transcoding on the QNAP TVS-472XT NAS were diffrerent in both test but not vastly. This could be down to the QNAP TVS-472XT hardware, or the fact the 2nd file needed to be a .MKV file for this bitrate. Take a look.

The QNAP TVS-472XT NAS 720P H.265 8-bit 24fps MKV PLEX Test 21 – How well does it perform?

In order to start the testing on the QNAP TVS-472XT NAS properly, I started with a relatively modern and regular 720p resolution file. I did throw a few curveballs into the mix with an MKV file. Aside from that, this media file is fairly representative of the larger than average files you will encounter from time to time when choosing media that is suitable for both larger and smaller devices. With the QNAP TVS-472XT plex media server, I was able to software transcode the file down to a manageable 480p (I wouldn’t dip below this on modern mobile devices unless you are on a strict data package). Though it did the job, the CPU use definitely was hogged by the QNAP TVS-472XT, as seen below:

Test File Type

  • 720p Resolution
  • HEVC Codec
  • 24FPS Frame Rate
  • 8 Bit Depth
  • h.265 Compression
  • MKV File Container
  • 24p Video Frame Rate

The QNAP TVS-472XT NAS 1080P H.264 8-bit 24fps MP4 PLEX Test 20 – How well does it perform?

After giving the QNAP TVS-472XT an easier file, I ramped the difficulty right back up again with another H.264 media file that was at 40MB/s bitrate and at 1080p resolution – I wanted to see if the earlier results were a fluke and to see how the QNAP TVS-472XT handles this heavier file. There was a noticeable change in CPU use, but the results bore similar results to before.

Test File Type

  • 1080p Resolution
  • HEVC Codec
  • 24FPS Frame Rate
  • 40MB/s Bitrate
  • 8 Bit Depth
  • h.264 Compression
  • MP4 File Container
  • 24p Video Frame Rate

I hope these Plex Media Server 4K results were of use to you and this helps you consider which NAS you wish to you buy in 2018, whether it is the QNAP TVS-472XT or something more or less suited to your needs.


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