when I googled for "Invalid value '1' for option 'mv4'" - first on the listI commented out hq="$hq -mv4 1" in ffmpeg_utils to make export works again.
I don't know if that helps you but try it - you can always uncomment if it does not help
when I googled for "Invalid value '1' for option 'mv4'" - first on the listI commented out hq="$hq -mv4 1" in ffmpeg_utils to make export works again.