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/ffmpeg-scripts

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 ... https://www.youtube.com/watch?v=RXGanx17g_I