There is no plan to support BCJ2 by py7zr since Python standard lzma module does not support. Conformant implementations SHALL accept these codec IDs and when it does not support it, it SHOULD report it as not supported. Here is an example what is TAR.XZ file of bytes of coder property when specifying LZMA. Following pseudo code indicate how each parameter located for informative purpose. Perhaps you need to increase the file size of a group of images, or you want to change the file [...]