unable to write mp4 video using opencv

[john_wick]

I am trying to write a mp4 video file on imx8m mini using opencv library. I am using ov5647 camera module.

Below is the code I am using to write video.

However, after I run this program, there is not test.mp4 file created at all. 
I have also tried fourcc's *H264 also, but the result is same.

Please suggest. Thanks in advance.

[Zhiming_Liu]

Hi

You must add return value judgment as you don't know if the camera has been opened.

Can you provide the log when you run this test?

BR

Zhiming

[john_wick]

Hi Zhiming,

Thanks for your response.

The return value of cap.isOpened was True, and also cap.read() also returns True.

However, this problem is now solved for me.

I understood that codecs were missing on the board to write mp4 video file.

I have added ffmpeg in local.conf file, and compiled the image.

After deploying, opencv was able to detect ffmpeg and now I am able to write mp4 video files.

Thanks