“Why is streaming of a 4K AVI media to the Apple TV 4K not working? When streaming the movie, the Plex server performs transcoding. I use PlexPy while the AVI video format is being streamed to the ATV 4K to determine whether or not transcoding is taking place.Can anyone explain me the technical reason 4K streaming to ATV 5 does not work with Plex but it works with Infuse?”

There is a hot topic on Apple and Plex forum: streaming 4K AVI to Apple TV 4K via Plex server is not working. Based on our testing and some guys’ feedback, Plex server on Apple TV 4K does yet not support 4K AVI. The Plex team “forgot” to update the Apple TV profile to support direct streaming when playing 4K material in the MP4 container, as this is supported out of the box. They are currently working on getting 4K content to play when using AVI container as well. But that doesn’t mean there isn’t a solution though! Here we put together 2 possible solutions for you.

Method 1. Using Infuse for direct streaming

To play 4K AVI on Apple TV 4K, one recommendation is to use Infuse 5.

It allows iPhone, iPad, and Apple TV owners to play nearly any video file without conversion and stream content stored on cloud services or networked storage complete with subtitles, AirPlay, and Google Cast support.

In addition to Apple-sanctioned MP4, M4V, and MOV formats, Infuse can play MKV, AVI, WMV, and a host of others, all with smooth hardware-based decoding in up to 4K resolution. It’s also officially certified for Dolby Digital Plus and DTS/DTS-HD audio playback, a claim few other media player apps can make.

We can perfectly stream 4K AVI media from Synology to the Apple TV 4K by using Infuse 5.

Method 2. Using video converter to transcode 4K AVI to Apple TV 4K friendly format

If you lacks interest for Infuse or Infuse doesn’t work for you, here is another option for you. Since Apple TV 4K can’t support AVI format, just convert 4K AVI to Apple TV 4K friendly MP4, M4V and MOV formats and then simply sync with iTunes.

Well, along with some help from third party program, it can be done effortlessly. Here we take U2USoft Video Converter for Mac for instance to show you how to get 4K AVI and Apple TV 4K to play nicely.

This Mac video converter triumphs over its competitors and successfully delivers the best possible output quality and fastest video conversion speed, up to 3-5X faster. It supports converting virtually all video formats in 4K or HD, ranging from AVI, HEVC (H.265), MKV, MTS, AVI, WMV, FLV, VOB, WebM, 3GP, to MP4, MOV, M4V playable on Apple TV 4K and other Apple devices. So, with it, you can transcode 4K AVI to Apple TV 4K easily and keep the best video quality. For Windows users, please get U2USoft Total Video Converter. Follow the steps to convert 4K AVI to 4K Apple TV for smooth playback.

Download 4K Video Converter for Mac:

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Download 4K Video Converter for Windows:

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How to Transcode 4K AVI to Apple TV 4K?

Step 1: Import video source

Run the Apple TV 4K Video Converter and then directly drag and drop your AVI videos to the software.

best 4K videos to Final Cut Pro

Step 2: Choose Apple TV 4K supported format

Click “Format” then switch to “Apple TV”. Here you can choose “Apple TV H.264 1920×1080(*mp4)” format as the output video.

hd video format

Tip: When you want to output 4K video for ATV 5, you need to back to the main UI then click “Settings”. In “Video Size” box, tap 3840×2160 into the box. Then you can adjust the video bitrate, frame rate and preview the output video size at the below chart.

Step 3: Start to convert 4K AVI to Apple TV 4K

Hit the “Convert” button to start 4K AVI to Apple TV 4K conversion process.

Just a few minutes, you will be able to get the output files for Apple TV 4K via clicking on “Open” button effortlessly. Now you can play the converted 4K AVI movies on Apple TV 4K with ease.