Check the NAS devices and limitations for Plex transcoding > Most NAS media are based on ARM CPU, which is not powerful enough to transcode 1080p, 4K videos. Then you probably find the MKV transcoding process stucks and MKV fails to play owing to underpowered hardware, especially when you're trying to play MKV on Plex from NAS. Even though your MKV file is compatibile with Plex, it is still required to be transcoded. However, to play MKV on Plex, such subtitles need to be burned on the video. That's why many people make their videos in MKV format. You know, MKV container is able to store video, audio and subtitle streams.

Your MKV files are TV shows or series, which will not show in Plex library if you haven't renamed them correctly.įrom above, subtitle is absolutely the most likely one for MKV transcoding on Plex.

The bit rate of the MKV is higher than Plex request.

The MKV video is not compatible with the devices that installed Plex media server.

You have turned off the Direct Play and Direct Stream option in Plex by accident.

Your MKV is packed with soft subtitle streams.Given this, why your MKV file is still required to be transcoded? Why Plex not recognizing your MKV files? There are many situations that can lead to this issue, for example: This means if your MKV is encoded with the above video and audio codec, it should be able to direct play on Plex.

Audio encoding: aac, ac3, alac, e-ac3,flac, mp3.Acoording to the, MKV with the following video and audio encoding is natively supported by Plex. Does Plex Support MKV? Why Is Your MKV Required to Be Transcoded?

Plex compatible nas