ffmpeg -i input.m4 -vf "[in]drawtext=text='Stack Overflow': \
fontcolor=white: borderw=2: fontfile=Arial Black: fontsize=w*0.04: \
x=(w-text_w)-(w*0.04): y=(h-text_h)-(w*0.04): enable='between(t,0,6)', \
drawtext=text='Stack Overflow': fontcolor=white: borderw=2: \
fontfile=Arial Black: fontsize=w*0.04: x=(w-text_w)/2: y=(h-text_h)/2: \
enable='between(t,7,10)'[out]" -codec:a copy output2.mp4