Write Mat::frame to stdout and pipe to ffmpeg

[dedsec]

@crackwitz

you should explicitly tell ffplay to convert, or use cvtColor and send rgb24 instead, which should be easier for ffmpeg to work with.

Thanks, I tried it but it is not working…

Mat toRgb;
cvtColor(frame, toRgb, COLOR_BGR2RGB);
for (size_t i = 0; i < toRgb.dataend - toRgb.datastart; i++){
       std::cout << toRgb.data[i];
}

The output of ffplay with rgb24 option:

---

But I find out weird behavior:
My code tree looks like this
├── src
—├── main.cpp
—└── detection
-----└── detection.hpp

the output of the code below works well only if I put it in the main.cpp.
If the code is running inside a class, the output will be as the third picture I sent above.

@dedsec

// Output to ffmpeg
for (size_t i = 0; i < frame.dataend - frame.datastart; i++){
        std::cout << frame.data[i];
}

Im trying to understand why but for now I didn’t find it…
Do you have the same behavior if you write the frame to ouput inside a class ?