Video and sound sync problem

hi fellahs, i’m a new member, i have this problem:

i have a HDMI multi media player capable to play .mkv files high def downloaded films. the problem is that some movies’ video and audio eventually got out of sync, i press forward then return to sync the sound. i converted the mkv files to dvd files the video and audio sync was fine but the problem is that it lost hi def resolution. i want to retain the mkv file format but is there any solution to the audio and video out of sync problem?

The problem may be in the files themselves, or the player. Since the audio becomes progressively out of synch and can be corrected, my vote is that the player is at fault. One potential issue is with 24 fps files, which really should be played at 23.9 but may not be. A lot depends on the files.