Opencv + ffmpeg

PLCnext Technology & PLCnext Controls
1

Hello, Could you upload opencv + ffmpeg library and ffmpeg user-application for PLCNext 2152? I built both library based on the tutorial, instruction and simple application works, but ipcam application didn’t work with the libraries. When I tried with ffmpeg user-application(“ffmpeg -i …”), the application didn’t work because interpreter setting inside of the app was not correct. Best regards, Atsushi

2

Hello Atsushi,

what exactly is the problem you are facing right now?

So you sucessfully build a demo application with OpenCV and FFMPeg?
I used to capture pictures from an AXIS IP Cam. cv::VideoCapture(WebcamUrl);

You can quick fix the Interpretersetting for the FFMPEG binary like this:

ln -s /lib/ld-linux-armhf.so.3 /lib/ld-linux.so.3

Or directly during configure time of FFMPEG with the LD flags I think.

kind regards,
Oliver

3

Hello Oliver-san, Thank you for the information. Now the ffmpeg application got to work by the symlink. However, VideoCapture() didn’t work(error returned “isOpened()”). Should I care about any version combination between opencv and ffmpeg? I’m using opencv 3.4.0 and ffmpeg 4.0.5. Best regards, Atsushi

4

Hello Atsushi, I need more code snippets and complete error messages to support you.

I am not aware of not working Version combinations but maybe you ca direct this question directly to the publisher of openCV and FFMpeg kind regards,
Oliver