Combining video files in matlab

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);

[Mohammad Sami]

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.

Answer 1

[Drishan Poovaya]

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