用到给视频添加背景音乐,并改变音量。记录一下,与碰到同样问题的朋友共享。
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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) # 查看音轨信息 print ( '*' * 80 ) cmd = 'ffmpeg -i ' + outmp3 + ' -filter_complex volumedetect -c:v copy -f null /dev/null' P = subprocess.call(cmd) |
记录几个cmd
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# 分别降低音量后叠加 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 # 纯音频,叠加,可控制音量,并且设置一个循环,并按照第一个截取时间 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 # 视频添加循环音乐 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 |
ffmpeg 隐藏调试信息
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- loglevel quiet |
资料参考:
https://stackoverflow.com/questions/13780736/ffmpeg-unable-to-find-a-suitable-output-format-for-i
https://stackoverflow.com/questions/44712868/ffmpeg-set-volume-in-amix
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原文链接:https://wqian.net/blog/2019/1031-python-ffmpeg-index.html