hi. I have a WD media player gen1 or gen2, its about 3yrs old. I have been having problems with HD files only, downloaded from internet. I have recently decided to do some reading up and sort these files out. I have downloaded MKVtoolnix, MKVfix and Mediainfo as recommended on other posts here. I ‘cleaned’ the files using MKVfix. This showed that header stripping had been removed from the mediainfo report. The video works fine but I do not have any audio through the media player. Audio works in VLC. Any advice would be much appreciated, thanks in advance!