Add a text to video

How can I add any text to MP4 video uploaded to Matlab?

Answer 1

[Walter Roberson]

Read frames and use computer vision insertText() and write the frame out.

With older MATLAB it would be vision.textInserter instead of insertText()

Answer 2

[Aleksandra Pestka]

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?

[Walter Roberson]

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]

Thank you so much!