Greetings. Does anyone knows how to solve this issue?

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Yusuf Ikmal
Yusuf Ikmal 2023-4-1
移动：Walter Roberson 2023-5-7
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Yusuf Ikmal
Yusuf Ikmal 2023-4-3
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.

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Amey Waghmare
Amey Waghmare 2023-4-21
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.
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Yusuf Ikmal
Yusuf Ikmal 2023-5-2
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?

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