Save a video from video frames and text

Hi everyone,

I have a video generated from an external software I want to insert dynamic text on each frame. I was able to do so in Matlab with the code below. However, I am clueless about the way to save the new video in a .mp4 or .avi file. I would like to have it in such format so that I can open it from any video readers.

Can anyone help?

Thank you! :-)

Alice

% Import video generated from an external software
v = VideoReader('video_L4_L8_Jan_cc25.mp4');
% Import csv file with metadata of each image
t = readtable('list_L4_L8_Jan_cc25.csv');

% Generate a video with the ID and time of acquisition of each image
figure
FrameRate = 1;

set(gcf,'units','centimeters');
set(gcf,'position',[10 10 30  30]);
axes1 = axes('position', [.05, .05, .9 , .9])

while hasFrame(v)
    vFrames1 = readFrame(v);
    imgNb = v.CurrentTime+1; % Nb of image displayed. +1 becaue CurrentTime starts couting at 0
    image(vFrames1, 'Parent', axes1);
    text(.5, 10, t.LANDSAT_SCENE_ID(imgNb), 'fontsize' , 14, 'Color' , 'w', 'Parent' , axes1);
    text(200, 10, t.DATE_ACQUIRED(imgNb), 'fontsize' , 14, 'Color' , 'w', 'Parent' , axes1);
    axes1.Visible = 'off';
    pause(1/FrameRate);
end

Answer 1

[Dave Behera]

The writevideo function can be used to write videos from an array to video file (.avi format supported). See this link:

http://www.mathworks.com/help/matlab/ref/videowriter.writevideo.html

[Alice]

Yay, thanks! For anyone interested, this is the way to use the VideoWriter function and get the desired video as detailed in the initial question:

k = VideoWriter('videoName'); k.FrameRate = 2; open(k);

for i = 1: length(frame for video) CODE FOR VIDEO FRAME AND TEXT HERE

frame = getframe; writeVideo(k,frame); end

Close(k)