FFmpeg: Concatenate videos

Introduction

FFmpeg连接（组合、合并）多视频文件的操作。

文献[1]示例代码：

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ffmpeg -i input1.avi -qscale:v 1 intermediate1.mpg ffmpeg -i input2.avi -qscale:v 1 intermediate2.mpg ffmpeg -i concat:"intermediate1.mpg|intermediate2.mpg" -c copy intermediate_all.mpg ffmpeg -i intermediate_all.mpg -qscale:v 2 output.avi

简述以上处理过程：文件input1.avi和input2.avi先经格式转换至mpg文件，随后这两个mpg文件首尾连接输出一个合并文件，最后将这一合并文件再经格式转换至.avi格式文件。

Example

在Matlab启动FFmpeg实现如上同样的处理流程，代码：

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% Created by LI Xu % Version 1.0 % April 20, 2016 % Description: % Combine several videos to one % 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/ clear clc % Source Directory SouDir='input'; % Destination Directory DesDir='output'; otpath=fullfile(DesDir, 'all.wmv'); % All Input Videos videos=dir(fullfile(SouDir, '*.wmv')); % Loop to convert input videos % to the mpg format disp('...Start to convert to mpg format...'); for ii=1:length(videos) vidname=videos(ii).name; [~, filename, ~]=fileparts(vidname); vidpath=fullfile(SouDir, vidname); % Mpg mpgpath=fullfile(SouDir, [filename, '.mpg']); ConToMpg(vidpath, mpgpath); end disp('...Finish to convert to mpg format...'); % All mpg Videos mpgfiles=dir(fullfile(SouDir, '*.mpg')); % Construct file path string vidstr=[]; for ii=1:length(mpgfiles) mpgname=mpgfiles(ii).name; mpgpath=fullfile(SouDir, mpgname); if isempty(vidstr) vidstr=mpgpath; else vidstr=[vidstr, '|', mpgpath]; end end disp('...Start to Concatenate...'); % Command outmpg='temporary.mpg'; cmdstr=['ffmpeg -i concat:"', vidstr, '"']; cmdstr=[cmdstr, ' -c copy ', outmpg]; [stuat, cmdout]=system(cmdstr); % Delete all mpg files DeleteMPG(SouDir, mpgfiles); % Convert to wmv ConToWMV(outmpg, otpath); delete(outmpg); disp('...Finish to Concatenate...'); disp('Exit'); disp('**************************************************');

File.rar.

注意：合并文件比之输入文件大小之和还大出许多。

References

[1] Concatenating using the concat protocol (file level).

[2] Concatenate two mp4 files using ffmpeg.