Add a text to video

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Aleksandra Pestka
Aleksandra Pestka 2018-1-20
评论： Aleksandra Pestka 2018-1-24
How can I add any text to MP4 video uploaded to Matlab?

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回答（2 个）

Walter Roberson
Walter Roberson 2018-1-20
Read frames and use computer vision insertText() and write the frame out.
With older MATLAB it would be vision.textInserter instead of insertText()
Aleksandra Pestka
Aleksandra Pestka 2018-1-23
I've read frames from my video. The code looks like:
v= VideoReader('My_movie.mp4');
currAxes = axes;
while hasFrame(v)
vidFrame = readFrame(v);
image(vidFrame, 'Parent', currAxes);
currAxes.Visible = 'off';
pause(1/v.FrameRate);
end
Now I want to use:
RGB = insertText(I,position,text)
However, I don't know what is I i this case. Can anyone suggest me what to do?
  2 个评论
Walter Roberson
Walter Roberson 2018-1-23
v = VideoReader('My_movie.mp4');
currAxes = axes;
while hasFrame(v)
vidFrame = readFrame(v);
I = vidFrame;
RGB = insertText(I,position,text);
vidFrame = RGB;
image(vidFrame, 'Parent', currAxes);
currAxes.Visible = 'off';
pause(1/v.FrameRate);
end
... which can of course be made shorter.
v = VideoReader('My_movie.mp4');
currAxes = axes;
while hasFrame(v)
image( insertText(readFrame(v)), position, text);
currAxes.Visible = 'off';
pause(1/v.FrameRate);
end
But you are better off using the more efficient:
v = VideoReader('My_movie.mp4');
currAxes = axes;
first = true;
while hasFrame(v)
RGB = insertText(readFrame(v)), position, text);
if first
h = image(RGB);
currAxes.Visible = 'off';
first = false;
else
h.CData = RGB;
end
pause(1/v.FrameRate);
end
Aleksandra Pestka
Aleksandra Pestka 2018-1-24
Thank you so much!

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