ffmpeg scripts updated and shell checked

Updated and shell checked my ffmpeg scripts for basic audio and video editing on the command line, the scripts work on linux, mac, unix and windows using the windows subsytem for linux

ffmpeg scripts github:
https://github.com/NapoleonWils0n/ffm...

ffmpeg scripts:

trim video and audio clips to the millisecond
scene detection to automatically chop a video into clips
video scopes like you get in final cut pro
picture in picture overlay
overlay a video clip over another video
combine an image or video with an audio file
ffmpeg xfade transistions between 2 video clips
extract a frame from a video clip as an image
create an animated gif from a video
create an animated webp image from a video
convert an image into a video and specify a duration
ebu meter to check audio levels
normalize audio levels in a audio or video
create a contact sheet with thumbnails from a video
add srt subtitles to a video as a track you can toggle on and off
ken burns style pan and scan over an image
add a silent audio track to a video

all the scrtips work with the find command so you can batch process audio and video

ffmpeg wiki xfade
https://trac.ffmpeg.org/wiki/Xfade