I don't have a Mag 254 but you should be able to go into settings and look for media player or players settings to see if there is anything you can change. I have a few players as well as internal player, external player for when you want to download and use a specific type of player like Perfect Player, VLC Player, etcetera. Different players use different audio and video codecs you may have the right video but the wrong audio codec. BBC and IPTV players might be something to look at for British channels.