VLC Media Player
"VLC is a free and open source cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols." - extract from website.
VLC also has MAC and iPad versions available as well.
This really is a great product and it is FREE. If you are having issues with your Video playing software, then try this out, follow the link below.
After installing the program, make sure you have set your Operating System to use the program by default for all MP4 files, or runing the mp4 file will not automatically use this software and may try and use your other software which may result in loss of audio.
Follow this link ... https://www.videolan.org/vlc/i...