cynthiad if there are two different sounds on a video, like a tv and a conversation a can you separate the two in different sceens? I an not fix it so I can hear the voices of the conversations.
borate If they are mixed together on a single track it's likely that little can be done. Upload a sample to a free server, like Google Drive or MS OneDrive. Make the sample public (share it), and post the shared link here. Someone will check it out.