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

1 Answer 1


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.

  • Many thanks Matt
    – geo667
    Jun 4, 2020 at 6:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.