Combining video files in matlab

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Cole
Cole 2021-6-22
编辑： Drishan Poovaya 2021-11-11
I want to use vision.VideoFileReader to combine 2 video files in matlab. Essentially, I have 2 videos which are 24:10 and 23:35 long each, where I want to append them together to make one video which should be 47:45 long. I have previously looked at VideoWriter and VideoReader and found them to be comparatively slow. However, I still am encountering a challenge in combining 2 videos. The resulting video from the code yielded a video which is a little over 24:33 long, and the filesize is now massive. I have pasted my code below.
vfr = vision.VideoFileReader('LLZO0024-04-21-24.MP4', 'AudioOutputPort',false);
vfw = vision.VideoFileWriter('LLZO0024-04-21-24_comb.avi', 'FileFormat','AVI', 'AudioInputPort',false, ...
'FrameRate',vfr.info.VideoFrameRate);
%Write the first of the two videos to a new file
while ~isDone(vfr)
[frame, audio] = vfr();
vfw(frame);
end
release(vfr);
%release the first video, and begin to write the second video to file.
vfr = vision.VideoFileReader('LLZO0024-04-21-24_2.MP4', 'AudioOutputPort',false);
while ~isDone(vfr)
[frame, audio] = vfr();
vfw(frame);
end
release(vfr);
release(vfw);
  1 个评论
Mohammad Sami
Mohammad Sami 2021-6-23
unless there is a specific reason to use matlab for this, i would suggest use a dedicated video processing software to join the two clips. there are free software available for this purpose. ffmpeg and vlc can also do this job.

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回答（1 个）

Drishan Poovaya
Drishan Poovaya 2021-11-11
编辑：Drishan Poovaya 2021-11-11
You can use while loops with the "hasFrame" check to write each frame of each video to the new file. Below is an example with two "MPEG-4" video files. Please note that the video frames in each video must be the same frame size but do not have to be the same length.
% Set up parameters
Vid1 = VideoReader('MyVideo1.mp4'); % Video 1
Vid2 = VideoReader('MyVideo2.mp4'); % Video 2
v = VideoWriter('MergedVideo','MPEG-4'); % Create new video file
open(v)
% Iterate on all frames in video 1 and write one frame at a time
while hasFrame(Vid1)
Video1 = readFrame(Vid1); % read each frame
writeVideo(v,Video1) % write each frame
end
% Iterate again in video 2
while hasFrame(Vid2)
Video2 = readFrame(Vid2);
writeVideo(v,Video2)
end
close(v)
Refer to this answer as well, it talks about the same problem
https://www.mathworks.com/matlabcentral/answers/592729-how-can-we-merge-two-separate-video-files-into-one

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