I videoed a friend's daughter's wedding.  I created my videos and made sure as I made them that I set the volume of all voice and music to FULL volume with slider before saving the video.  Once completed I downloaded them as HD versions for high quality picture.  Sound on playback on my computer which I made them on is fine...but as soon as I save the HD file to a flash stick and play it back in a different computer or on a smart tv...the volume level is drastically reduced.   Turning it up to maximum volume of either computer or tv still plays it back at a low level.  Any ideas what I can do the raise video volume?    Thanks for any suggestions