How to rotate a video 180 degrees?

I have videos in .mp4 format and I need to rotate them vertically so that they will rotate 180 degrees.

I wrote the code and it rotates 180 degrees, however, it only takes one frame, so the video duration is 0 and the video is grayscale, which is a thing that I don't want since the video includes a red fixation point.

vidName = 'SID12.mp4';
vidPath = strcat(videosPathToBeEdited, vidName);
    
V= VideoReader(vidPath); 

for k=1:video_duration*FrameRate
   
   RGB= readFrame(V);

   clear temp
   
   image_rot = flipud( RGB );
   rotated_vid = image_rot;
   
end
rotated_vid = rotated_vid(:,:,end:-1:1);
%calling save video function in another .m file
savemy_video(rotated_vid,[vidName(1:end-4), '_rev_rotated' video_duration_inname]);

Are there any easier and quicker ways to rotate a video? or if you could help me with this code would really appreciate it.

Answer 1

[Stephan]

vidName = 'xylophone.mp4';
vidPath = strcat(videosPathToBeEdited, vidName);
V = VideoReader(vidName); 

% read the complete video and flip it without loop
RGB = read(V);
RGB_flip = flipud(RGB);

% save the new file
V_flip = VideoWriter('C:\YOUR_PATH_NAME_HERE\xylophone_flip','MPEG-4'); 
open(V_flip)
writeVideo(V_flip,RGB_flip)
close(V_flip)

% read the flipped video
V_flip = VideoReader('C:\YOUR_PATH_NAME_HERE\xylophone_flip.mp4'); 

% play the flipped video
while hasFrame(V_flip)
   frame = readFrame(V_flip);
   imshow(frame)
   pause(1/V_flip.FrameRate);
end

[Gulce Lale]

thank you, this flips the video, however, the duration becomes 6 instead of 3, and the frame rate is slower.

[Stephan]

Edited this:

% save the new file
V_flip = VideoWriter('C:\YOUR_PATH_NAME_HERE\xylophone_flip','MPEG-4'); 
% Ensure same Frame rate - BEFORE open the new video object:
V_flip.FrameRate = V.FrameRate;
open(V_flip)
writeVideo(V_flip,RGB_flip)
close(V_flip)

[Gulce Lale]

Thank you! I solved the problem, and your solution also works!

[Stephan]

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