This question already has an answer here:
Some files are compressed using their own compression scheme and some aren't. If I try Max compression on an already compressed file, I'll get 1%-2% better compression at most. The amount of time wasted compressing those files are worthless.
I want 7zip to use the Store or Fast level of compression instead of Max for those already compressed files, while using Max on the uncompressed files. I can do this if I go into the directory and make 2 different 7z files for multiple different kinds of file types stored in that folder. But is there a way to store these differently compressed files inside the same 7zip file? The files that aren't already compressed will be compressed and the ones that are will just be stored.
Has anybody found a way to do that?