FFmpeg: Clip Audio Files

Introduction

剪辑音频文件，提取出文件特定时间的音频资料，并且周而复始。

文献[1]示例代码：

1	ffmpeg -ss 0 -t 30 -i file.mp3 file.wav

代码

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% Created by LI Xu % Version 1.0 % April 11, 2017 % Description: % % If you have any question about this code, % please do not hesitate to contact me via E-mail: % jeremy456@163.com % Blog: % http://blog.sciencenet.cn/u/lixujeremy % http://lixuworld.blogspot.com/ % Reference % http://stackoverflow.com/questions/7945747/how-can-you-only-extract-30-seconds-of-audio-using-ffmpeg clear; clc; timebegin=tic; cur_data=date; cur_time=fix(clock); str1=sprintf('%s %.2d:%.2d:%.2d', cur_data, cur_time(4), cur_time(5), cur_time(6)); fprintf('Time Begin: '); fprintf(str1); fprintf('\n'); % XLS xlspath='AudioInfo.xlsx'; [~, conaud]=xlsread(xlspath); conaud(1, :)=[]; % Source Directory SouDir='input'; % Destination Directory DesDir='output'; % Loop for ii=1:size(conaud, 1) rowrd=conaud(ii, :); filepath=GetFilePath(SouDir, rowrd{1}); if filepath==0 continue; end [~, filename, ext]=fileparts(filepath); inpath=fullfile(SouDir, [filename, ext]); otpath=fullfile(DesDir, [filename, ext]); if exist(otpath, 'file') delete(otpath); end % Start sttm=rowrd{2}; % Finish fitm=rowrd{3}; % Construct Sentence Constr=['ffmpeg -ss ', sttm, ' -t ', fitm, ' -i ', inpath, ' ', otpath]; disp(['...Start to process ', filename, ext, '...']); [stuat, cmdout]=system(Constr); disp(['...Finish ', filename, ext, '...']); end fprintf('Time Begin: '); fprintf(str1); fprintf('\n'); cur_data=date; cur_time=fix(clock); str2=sprintf('%s %.2d:%.2d:%.2d', cur_data, cur_time(4), cur_time(5), cur_time(6)); fprintf('Time End: '); disp(str2); timespan=toc(timebegin); fprintf('Time Span: %.4f s\n', timespan); disp('******************************************');

file.rar

References

[1] How can you only extract 30 seconds of audio using ffmpeg?