In particular, take note of the following parameters. There could also be settings in the program's preferences and other places. Export Settings, which determine the format of the final exported video.Timeline Settings, which affect individual timelines.Capture Settings, which determine how the video will be captured.Project Settings, which affect the entire project.A typical editing application might have the following settings (this is a hypothetical example only - your editor may differ somewhat): This may take a while, and you may need to hunt around to find where all your settings are. When you create a new video project, check all your settings. Unless you have a good reason to do otherwise, you should edit video in its native format. For example, if you import a PAL video into an NTSC project, the video frame rate and resolution will be converted and the picture will be compromised. The biggest cause of avoidable quality loss comes from accidentally converting the video in some way. You need to work through each stage of your editing process and identify any potential problems. Solution: This is a very general problem that can have many causes, in fact there are often multiple causes each degrading the quality a little bit. Problem: Your original video footage is good quality, but after editing and/or encoding, it looks terrible. FAQ: My video loses quality during the editing process