Thank you, Igor, interesting program! Quite a lot of settings! Saved a video with the same settings as the original - the file size decreased by 22 percent. Great! I support the proposal to view the old and new changes in the file. I did not find the ability to undo actions (Ctrl-Z). Question: when inserting a video from this program into PTE AV Studio, will there be further repeated improvement of the inserted video? Do I need to run the output MP4 file through this program after PTE AV Studio?