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How can I apply lossy compression on a video using the command-line?

When I use the default compression tool available in Ubuntu (ie. package the video into a tar.gz, zip, etc. file), I don't get much of a difference in size, so I suppose they use lossless compression?

TellMeWhy
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    gzip and zip use lossless compression. The files don't shrink because their encoding uses compression already (already compressed data usually don't shrink, they might even grow). The only solution would be re-encoding them with a lower quality (e.g. using ffmpeg). Which video encodings are we talking about? – kos Dec 15 '15 at 10:57
  • @kos mp4, webm, and flv – TellMeWhy Dec 15 '15 at 11:06
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    See if this helps: http://askubuntu.com/a/249918/380067 – kos Dec 15 '15 at 11:12
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    Also http://unix.stackexchange.com/questions/28803/how-can-i-reduce-a-videos-size-with-ffmpeg – Rmano Dec 15 '15 at 14:25

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