resx="${arg#*width=}"; resx="${resx%%${BR}*}"
resy="${arg#*height=}"; resy="${resy%%${BR}*}"
length="${arg#*duration=}"; length="${length%%${BR}*}"
resx="${arg#*width=}"; resx="${resx%%${BR}*}"
resy="${arg#*height=}"; resy="${resy%%${BR}*}"
length="${arg#*duration=}"; length="${length%%${BR}*}"