Why does editing a video by Adobe Premiere Pro more than once decreases its quality?

Question

For example: On first edit, I decreased the speed of video and saved it. Then again I imported it and made some other changes, like brightness adjustment, and saved. When I check the final file, the quality of video is decreased. Why does it happen? Is there any way to fix this?

Answer 1

I did that myself many times. What you need to do is NOT allow PP to select the output format. BUT! Reimporting and Exporting is something that should NEVER BE DONE! Just add it to the original timeline and redo it that way. If you MUST do that due to time constraints. You can cheat by selecting an output with at least a 50mb data rate. Then when you redo it - it will be passable. NOT AS GOOD as it should be. But doable.