Written by Hundreds of millions of people now getting the new ways of home entertainment – You can organize the media files into versatile libraries, display your libraries using one of the visually stunning skins and retrieve metadata from the Internet with Plex Media Sever. But the problem with is, when you plan to stream and play MKV file with Plex, you may be able to do this, but may be unable to. So what’s the matter? Why Plex can’t recognise MKV sometimes? In this article, we will show you the three solutions to solve Plex Not finding a MKV movie problem.
Possible Three Ways to Enable Plex Read MKV files:
Way 1: Firstly, make sure you’ve added the directory to your library and updated it. Since Plex requires a special naming convertion for TV shows in order to download the metadata of them properly, if your MKV videos are TV shows, please try to rename the MKV files so they have simpler names (e.g. Series – S01E01 – Episode Name). There is another solution. We can make a new library or pick Other or Personal Media and put the MKV TV shows in there. After that, these MKV files will show up and be streamed to TV.
If it does not help, more than likely it is a permission problem. You need to change the group ownership on the folders in which you save the MKV files. Setting the permissions to be recursive is highly recommended. So the sub folders have the same permissions.
Way 2: If your MKV files are not accepted by Plex, it’s probably because of the video codec incompatibility. In this situation, the easy option is to convert incompatible MKV to Plex supported MKV for successfully playback. As a free MKV decoder and encoder, Handbrake will help you to re-encode video or audio track to make it more compatible with Plex using optimized settings.
However, though you have converted MKV source by Handbrake, sometimes you still cannot play and watch them on your iPhone, iPod or iPad through Plex server. What’s worse, the output videos are usually not in good quality as you expect. You need an alternative tool instead.
Way 3: Along with help from Pavtube Video Converter you fill the compatibility gap between MKV and Plex easily.
Overall, it is one of the best video encoding and decoding apps for Plex. It assists you to convert a wide range of video formats including MKV, AVI, MP4, M2TS, WMV, MKV, FLV, VOB, MXF and more to Plex video format for playing smoothly while keeping the original video quality. Plus, it also provides hundreds optimal presets for Apple TV, iPad, iPhone, Galaxy Tab, Amazon Fire TV, Samsung TV, etc to satisfy your diverse needs. What’s more, with its built-in video editor, you can personalize and retouch your videos in clicks.
If you are using a Mac user, please turn to the Pavtube Video Converter for Mac, which supports converting MKV files for playing on Plex on Mac. Here is a detailed guide on how to convert MKV to Plex supported video in order to successfully play MKV on Plex with no restriction. 
Other Download:
– Pavtube old official address: http://www.pavtube.com/video_converter/
– Amazon Download: http://download.cnet.com/Pavtube-Video-Converter/3000-2194_4-75734821.html
– Cnet Download: http://download.cnet.com/Pavtube-Video-Converter/3000-2194_4-75734821.html
How to Encode MKV to Plex supported formats for smooth playing?
1. Click “Add video” button to import MKV shows to the best MKV to Plex Converter. The time for importing depends on the number of your TiVo files loaded. 
2. Select an output format for Plex
Click on the dropdown menu of “Format” and then move your pointer to “HD Video”, under the sublist, “H.264 HD Video(*.MKV)”, “MPEG-4 HD Video(*.MKV)”, are compatible with Plex 
3. Start converting MKV to Plex
Click the “Convert” button; it will convert MKV to Plex in no time. You can find the converting process in the “Conversion” interface. After the conversion, you will be able to get the output files via clicking on “Open” button effortlessly. Now you can add MKV to Plex for playback easily.
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