Hi everyone - I'm not new here. After hardware problems I had to re-register. Oh well. I can download Youtube videos to my hard drive in a .mp4 format. I can combine several of the mp4 files using Movie Maker (came with my computer). I can save the combined files in mp4 format. But when I copy the mp4 to a disk and try to view it on my home entertainment system (Samsung) I get the video but no audio. Can anyone suggest a fix to the "no audio" problem? I can save the downloads to other file formats but Movie Maker does not recognize all of the formats. Thanks.