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I want to compress a video to store it for backup purpose.

By that, I mean that I don't need to play video when it is compress format. So I don't want to lose quality or something like that, just compress it.

I have tried to compress with 7zip, but size not decrease. Is it possible to compress a video ?

For example, I use 7zip on a 3.92Go mkv video. I try :

  • zip format : 3.92Go
  • gz format : 3.88Go
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Generally no. Compression algorithms search for repetitive data and replace it with a shorter code and keep a dictionary with all codes. Compressing text works excellent because in longer texts a lot of words repeat.

With video this work has been done most of the time already. Usually the encoder is performing a similar operation: looking for repeating patterns and replacing them with a shorter code. Most video files you see are already compressed, most repetitive patterns already encoded and therefore any further compression won't do much.

Sometimes re-encoding videos with a much newer encoder saves a lot of space, but this process is always a bit lossy and requires more work.

You could check if the files have any additional unwanted audio tracks and remove them, like tracks in languages you don't speak anyway.

| improve this answer | |
  • Many thanks Matt – geo667 Jun 4 at 6:45

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