Opencv4nodejs: Missing CV_FOURCC() function

[djipco]

I'm trying to set the CV_CAP_PROP_FOURCC property on my VideoCapture object. However, I cannot find the CV_FOURCC() function usually used to convert from 4 chars to an int.

I tried the following:

this.opencv.vCap.set(cv.CV_CAP_PROP_FOURCC, cv.VideoWriter.fourcc("mjpg"));

But it gives me the following error:

VideoCapture::Set - expected arg 0 to be of type: INT

Ideas?

[justadudewhohacks]

Yeah, CV_CAP_PROP_FOURCC is from the old C API, which I didn't export, thus it's undefined. In the C++ API it is simply CAP_PROP_FOURCC, so cv.CAP_PROP_FOURCC that should work.

You can have a look at the file, where I export all the CAP_PROPs: videoCaptureProps.cc .

[djipco]

Oh, right! I thought the problem was with this part: cv.VideoWriter.fourcc("mjpg"). In any case, when I'm looking for a function/property what should I use as a reference? The latest C++ API?

Thanks again for your help.

[djipco]

For future reference (it may help someone down the road), the character code should be in caps. This is the full line to get it working:

vCap.set(cv.CAP_PROP_FOURCC, cv.VideoWriter.fourcc("MJPG"));

P.S. MJPG provides much better throughput (resolution/frame rate) than the other ones. You have to consider that USB2's bandwidth is rather limited.

[justadudewhohacks]

Oh, right! I thought the problem was with this part: cv.VideoWriter.fourcc("mjpg"). In any case, when I'm looking for a function/property what should I use as a reference? The latest C++ API?

Currently the entire API and usage is documented here: https://justadudewhohacks.github.io/opencv4nodejs/docs/

I agree it's a little inconvenient, but a webpage for this project will follow soon with hopefully a better overview of the documentation.

[djipco]

Ok, awesome. I'm really beginning to like OpenCV, thanks to your nice library!