ImageMagick version

7.1.1-33

Operating system

Windows

Operating system, version and so on

Windows 11 23H2

Description

Reading a video file via the C or C API of ImageMagick on Windows will leave behind a copy of the file in the temporary directory.

I've identified that two temporary files are created in ReadVIDEOImage:

read_info->unique is used as the output file path for the delegate. read_info->filename is used as the input file path for the delegate. Note that AcquireUniqueSymbolicLink creates a copy of the file when running on Windows.

After building the delegate command line, read_info->filename is overwritten with the content of read_info->unique:

The two temporary files should in theory be removed in these lines:

But as read_info->filename has already been overwritten, this will not remove the temporary file.

Note that MagickCoreTerminus will delete this temporary file. This is why the problem is not directly observable with the ImageMagick command line tools.

Steps to Reproduce

The following trivial Magick program reproduces the problem:

#include <Magick  .h>
#include <iostream>

int main(int argc, char **argv)
{
    Magick::InitializeMagick(*argv);

    try
    {
        Magick::Image image;
        image.read("F:\\test.mp4[0]"); // any file that ImageMagick identifies as video will do
    }
    catch (Magick::Exception& error)
    {
        std::cout << "Error: " << error.what() << std::endl;
    }

    // Temporary file still exists.

    Magick::TerminateMagick();

    // Temporary file has been deleted.
}

Images

No response