import subprocess

inmp4='E:/PycharmProjects/untitled2/hecheng/191030_232_xs.mp4'
inmp3='E:/PycharmProjects/untitled2/hecheng/bg.mp3'
inmp32='E:/PycharmProjects/untitled2/hecheng/bg2.mp3'
outmp3='E:/PycharmProjects/untitled2/hecheng/bg_out.mp3'
outmp4='E:/PycharmProjects/untitled2/hecheng/191030_232_xs_bg.mp4'


cmd='ffmpeg -y -i '+ inmp4 +' -i '+ inmp3 +' -filter_complex \
"[0:a]volume=10dB[a0]; \
[1:a]volume=-10dB[a1]; \
[a0][a1]amix=inputs=2[a]" \
-map 0:v -map "[a]" -c:v copy -c:a aac -shortest '+ outmp4

p = subprocess.call(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

# 查看音軌信息
print('*'*80)
cmd='ffmpeg -i '+ outmp3 +' -filter_complex volumedetect -c:v copy -f null /dev/null'
P = subprocess.call(cmd)

# 分別降低音量后疊加
cmd='ffmpeg -y -i '+ inmp4 +' -i '+ inmp3 +' -filter_complex \
"[0:a]volume=10dB[a0]; \
[1:a]volume=-30dB[a1]; \
[a0][a1]amix=inputs=2[a]" \
-map 0:v -map "[a]" -c:v copy -c:a aac -shortest '+ outmp4

# 純音頻，疊加，可控制音量，并且設置一個循環(huán)，并按照第一個截取時間
cmd='ffmpeg -y -i '+ mp4p3 +' -i '+ inmp3 +' -filter_complex \
"[0:a]volume=10dB[a0]; \
[1:a]aloop=loop=-1:size=2e+09[a1]; \
[a1]volume=-15dB[a12]; \
[a0][a12]amix=inputs=2:duration=first:dropout_transition=2" ' + outmp4mp3

# 視頻添加循環(huán)音樂
cmd='ffmpeg -y -i '+ inmp4 +' -i '+ inmp3 +' -filter_complex \
"[0:a]volume=10dB[a0]; \
[1:a]aloop=loop=-1:size=2e+09[a1]; \
[a1]volume=-15dB[a12]; \
[a0][a12]amix=inputs=2:duration=first:dropout_transition=2[a]" \
-map 0:v -map "[a]" -c:v copy -c:a aac -shortest '+ outmp4

-loglevel quiet