[LAU] How to combine separate video and audio tracks together?

I've done nothing with video except play them from YouTube.

I've noticed that YouTube separates HD1080 video from the audio tracks,
meaning I can't just download the HD1080 vid and watch it comfortably
using my USB sound card. But I can download the HD1080 vid and the audio
track separately.

Ideas? Thanks.

-- 
David W. Jones
gnome@email-addr-hidden
authenticity, honesty, community
http://dancingtreefrog.com
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