Greetings. Does anyone knows how to solve this issue?

[Walter Roberson]

You opened the model stored in your desktop but you have the same file stored in your FY project directory, and you are not cd to the desktop . That can lead to problems: you might not be executing the code you think you are executing

[Yusuf Ikmal]

Firstly thank you sir for willingly to reply my question. For the problem, I already removed the same file stored in the other project directory as you mentioned, but the error (in red) still not solved yet. Do you have any idea on this size dimension problem? I still cannot figure it out. Thank you.

[Walter Roberson]

I do not see anything obvious. Can you attach the model for testing?

[Yusuf Ikmal]

Sure. Here is the model. You can try run the model using the given video. Thank you and I hope I can get the solution.

[Tran Nam Trung]

no i don't

Answer 1

[Amey Waghmare]

Hi,

As per my understanding, you are encountering an error in the ‘Selector’ block while running the model.

The error is because the input to this block is of size 0. Upon further investigation, I found out that this is because the ‘Pts’ output of ‘Hough Lines’ block in ‘Warning Signal Module’ is empty. This is because the first frame of the video ‘freeway-8356.mp4’ is a complete black image which results in empty ‘Theta’ and ‘Rho’ for this frame and causes the error.

In order to resolve the error, please specify the video file in ‘From Multimedia File’ block without any full black frame. For the ‘freeway-8356.mp4’ video you can remove the first frame in MATLAB using the following code,

clear;
clc;
vid = VideoReader('freeway-8356.mp4');
newVid = VideoWriter('freewayNew.mp4', 'MPEG-4');
open(newVid)
for frameNums = 1:300
    I = readFrame(vid);
    if frameNums > 1
        writeVideo(newVid, I)
    end    
end
close(newVid)

This will create a new video file ‘freewayNew.mp4’ containing only the frames from 2 to 300 of ‘freeway-8356.mp4’

I hope this helps.

[Yusuf Ikmal]

Helo, thanks for the reply. I tried to do as you suggest and it works! Thank you very much. And another question, do I need to do the same method if I try to use different video file?