# addsound
ffmpeg -f lavfi -i aevalsrc=0 -i $infile -vcodec copy -acodec aac -map 0:0 -map 1:0 -shortest -y $outfile

# join
ffmpeg -i head2.mp4 -i input.mp4 ^
  -filter_complex "[0:v:0][0:a:0][1:v:0][1:a:0]concat=n=2:v=1:a=1[outv][outa]" ^
  -map "[outv]" -map "[outa]" -y output.mp4


# make
ffmpeg  -f lavfi -i color=c=white:s=640x368:d=10^
 -vf drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=40:fontcolor=orange:x=(w-text_w)/2:y=60:text='3.18　勿忘国耻',^
drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=16:fontcolor=black:x=(w-text_w)/2:y=130:text='战疫期间，宅家的日子里。',^
drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=16:fontcolor=black:x=(w-text_w)/2:y=150:text='拿起两年没时间练习的吉它。弹奏一曲《爱的罗曼史》。',^
drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=16:fontcolor=black:x=(w-text_w)-40:y=h-text_h-40-40:text='田东中学',^
drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=16:fontcolor=black:x=(w-text_w)-40:y=h-text_h-20-40:text='初二6班',^
drawtext=fontfile=sarasa-gothic-sc-regular.ttf:fontsize=16:fontcolor=black:x=(w-text_w)-40:y=h-text_h-40:text='黄科宁',^
fps=fps=29.44 ^
 -y  head.mp4