MP4 video editor recommendations ?

Can try the Windows Movie Maker program that comes on Windows XP Professional (does not come on windows 7).

Have used it to make picture videos and upload them to youtube. Also can edit some videos by working the clips on the time line. Can save to different formats too.

Think I have had to use "Any Video Converter" program (downloaded from
online) to change the videos so they will play.

Been a while, works pretty good, don't think it will do the side by side clips though.

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Something to look into.