python给视频添加背景音乐并改变音量的具体方法
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。
importsubprocess 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]"\ -map0:v-map"[a]"-c:vcopy-c:aaac-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_complexvolumedetect-c:vcopy-fnull/dev/null' P=subprocess.call(cmd)
记录几个cmd
#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]"\ -map0:v-map"[a]"-c:vcopy-c:aaac-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]"\ -map0:v-map"[a]"-c:vcopy-c:aaac-shortest'+outmp4
ffmpeg隐藏调试信息
-loglevelquiet
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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