FRITZ!Box 6840 LTE Service - Knowledge Base

FRITZ!Box 6840 LTE Service

Samsung device does not play MKV video files

A television, Blu-ray player, or another Samsung device will not play video files in the Matroska container format ("MKV") from the FRITZ!Box Media Server. When you try to play them, the device may display the error message "not supported file format" or "unknown file format".


  • Due to technical reasons, Samsung devices cannot play videos with the file extension *.mkv from the FRITZ!Box Media Server or some other UPnP AV servers. This is not an error on the part of the FRITZ!Box.

Changing file extension of MKV video files

  1. Change the file extension of the video files from ".mkv" to ".avi" on a computer. Refer to the manufacturer of the operating system for information on the procedure.