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How to replace a frame (rgb image) in a small video sequence ?

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raviraja on 13 Feb 2017
Edited: Walter Roberson on 21 Apr 2018
I want to replace a single rgb frame in a 4 sec video sequence, example i want to replace the 5th frame with my rgb image of same dimension as the video dimension (example 256x256)


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Accepted Answer

Walter Roberson
Walter Roberson on 13 Feb 2017
vid = 'NameOfTheVideo.avi';
obj = VideoReader(vid);
newobj = VideoWriter('NameOfNewVideo.avi', 'Uncompressed AVI');
replacement_frame_5 = randi([0 255], 256, 256, 3, 'uint8'); %or as appropriate
fr = 0;
while hasFrame(obj)
fr = fr + 1;
a = readFrame(obj);
if fr == 5
a = replacement_frame_5;
writeVideo(newobj, a);
clear obj


raviraja on 21 Feb 2017
Hi Mr. Walter, thanks for the help with minor modification it works just fine, after replacing the frame in video how to display the video ? I used implay but it showing me some error I am attaching the screenshot here can you suggest me here,, I saved the video file in 'writer' variable name attaching that variable data also again thanks for the help...
Walter Roberson
Walter Roberson on 21 Apr 2018
It is not possible to play a video writer object. Once the video writer object is closed, use one of the techniques to play the video by name. Or create a video player object and step(player, a) as you go through outputting the frames to the video writer object.

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