What is the best CLI tool (preferably Linux based) that will allow concatenating video files, and also compressing them on the client-side for YouTube upload?
My best bet is ffmpeg. It is powerful enough to do what you want.
You can merge 2 video files with this command line:
mencoder -ovc copy -oac copy video1.avi video2.avi -o output.avi
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mencoder is rather hard to find... The Google hits lead you to MPlayer, and when you download it's actually called SMPlayer. Any ideas where to find mencoder, really? – Alex R Dec 19 '09 at 20:06
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mencoder, transcode and ffmpeg are your friends (amongst others) you could also use vlc in CLI mode (AFAIK uses ffmpeg) or mplayer (mencoder)
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VLC tends to supply its own ffmpeg build internally, so it's worth trying separately if ffmpeg isn't quite doing what you want. – quack quixote Dec 9 '09 at 14:54
