(Tk GUI) Merge 2 audio tracks within a single video file, while customizing the 2nd track's volume before merging.
used personally for my youtube alt account, where i record gameplay video with obs, and my voice (on the 2nd audio track) is a bit loud.
ffmpeg.exe must exist on the script's directory.
The preview current volume feature will calculate which 10 seconds part of the video has the loudest voice (on the 2nd audio track), and then showing preview of combined audio on that specific part.
