I've tried editing captured gameplay and saved the videos for uploading on YouTube, but after WMM saves, the video gets all grainy with annoyingly large pixel-like boxes. The original captured videos are already at a high bitrate, so they cannot be the cause. My save settings were also at 12000kbps or more, but they don't look any different from a test video that I made at 8000kbps. My other save settings were: resolution at 1920x1080, frame rate at 60fps (I've also done 30fps tests with little to no improvement), and 192kbps audio.