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

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raviraja
raviraja 2017-2-13
编辑： Walter Roberson 2018-4-21
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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Walter Roberson
Walter Roberson 2017-2-13
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;
end
writeVideo(newobj, a);
end
close(newobj);
clear obj
  2 个评论
raviraja
raviraja 2017-2-21
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 2018-4-21
编辑：Walter Roberson 2018-4-21
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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