Did you install the no-codecs version of mint, if so have you added the codecs? Otherwise please provide more information, what players, what files? If on the internet provide links.
[Edit] your original post and add [SOLVED] once your question is resolved.
“The people are my God” stressing the factor determining man’s destiny lies within man not in anything outside man, and thereby defining man as the dominator and remoulder of the world.