The data directory used by Plex Media Server to store its files is dependent on the operating system that is used as your Plex server. The table below lists the default location of the Plex data directory for each system.
The following table shows the video formats that are supported by Plex.
For 4K movies, the supported formats for those movies are indicated in the table.
H.256 (hevc) (4K)
H.265 (hevc) (4K)
The music formats supported by Plex are listed in the following table.
While Plex supports the above formats, the clients you use to play your files must also support the formats. If a client does support the format, then Plex will direct play the file instead of transcoding, or direct stream, the file to the client.
The best solution would be to have Plex direct play as much of your content as possible, especially for movies. There is a simple method you can use to get Plex not to transcode movies very often.