There are examples in Crypt::CBC synopsis, including an example of encrypting a "large" file, such as your multimedia file might be. Have you tried using Crypt::CBC as suggested there?

In reply to Re: Multimedia file encryption : Crypt::CBC or Crypt::Rijndael by ig
in thread Multimedia file encryption : Crypt::CBC or Crypt::Rijndael by sundeep

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