Better .ini default
remove /usr/bin/ffmpeg default from Linux--just look for FFmpeg. this avoids confusing error message when FFmpeg not installed, or installed elsewhere on PATH. Thanks to @VanshCodes for reporting.
remove /usr/bin/ffmpeg default from Linux--just look for FFmpeg. this avoids confusing error message when FFmpeg not installed, or installed elsewhere on PATH. Thanks to @VanshCodes for reporting.