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extract slides from videos

Home Page: https://szanni.org/slideextract/

License: BSD 2-Clause "Simplified" License

C 43.15% Makefile 11.12% Roff 9.69% C++ 36.03%

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sahanduiuc shuuji3 zxxz sparkma arvgarg syskeydemon dunhill vergenzt rajmytasker booooda1 gauravken4 smo-ai amgdgwily99

slideextract's Issues

Last video frame is not written to file in all cases.

It seems like the last video frame is not written to file in all cases.

Using `-r` does not behave the way it is descibed as in the docs.

The help and manual describe the -r option to be used as X1.Y1:X2.Y2, suggesting two coordinate points are required.
It requires a point and width and height instead though X.Y:W.H.

Fix the docs, the implementation or add two options (preferred):
X1.Y1:X2.Y2 and X1.Y1:W+H or similar.

Error during `make install`

Lovely project, this issue.

/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2348:29: error: no member named 'val' in 'cv::Scalar_<float>'
    return Scalar_<float>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                          ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2348:43: error: no member named 'val' in 'cv::Scalar_<float>'
    return Scalar_<float>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                        ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2348:57: error: no member named 'val' in 'cv::Scalar_<float>'
    return Scalar_<float>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                                      ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2348:71: error: no member named 'val' in 'cv::Scalar_<float>'
    return Scalar_<float>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                                                    ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2355:30: error: no member named 'val' in 'cv::Scalar_<double>'
    return Scalar_<double>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                           ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2355:44: error: no member named 'val' in 'cv::Scalar_<double>'
    return Scalar_<double>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                         ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2355:58: error: no member named 'val' in 'cv::Scalar_<double>'
    return Scalar_<double>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                                       ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2355:72: error: no member named 'val' in 'cv::Scalar_<double>'
    return Scalar_<double>(a.val[0] * s, a.val[1] * s, a.val[2] * s, a.val[3] * s);
                                                                     ~ ^
/usr/local/opt/opencv/include/opencv4/opencv2/core/types.hpp:2388:24: error: no matching constructor for initialization of 'Matx<double, 4, 1>'
    Matx<double, 4, 1> c((Matx<double, 4, 4>)a, b, Matx_MatMulOp());

OpenCV::imwrite receives 3 params but needs num%2==0

When I run the slide extractor, I always receive the following error:

terminate called after throwing an instance of 'cv::Exception'
  what():  OpenCV(4.7.0) /usr/src/debug/opencv/opencv-4.7.0/modules/imgcodecs/src/loadsave.cpp:738: error: (-2:Unspecified error) in function 'bool cv::imwrite_(const String&, const std::vector<Mat>&, const std::vector<int>&, bool)'
> Encoding 'params' must be key-value pairs:
>     '(params.size() & 1) == 0'
> where
>     'params.size()' is 3

zsh: IOT instruction (core dumped)  slideextract -g cross-validation.mp4 cross-validation

It seems slideextract.cpp:171 the imwrite(_, _, params) -> params argument requires a key-value pairwise array ([k1, v1, k2, v2, ..., kn, vn]).

I commented out line 152 and then the program runs without errors. I don't know if this is a proper fix or not, since i don't know how OpenCV works.

OpenCV version: 4.7.0

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