FatalExecutionEngineError

[AppeazeTheCheese]

I'm aware this error isn't very helpful but here it is anyway:

Managed Debugging Assistant 'FatalExecutionEngineError' 
  Message=Managed Debugging Assistant 'FatalExecutionEngineError' : 'The runtime has encountered a fatal error. The address of the error was at 0x1fc555ce, on thread 0x42f4. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.'

So, I'm writing a discord bot to be able to detect gifs and videos that can crash discord clients. Well, turns out it crashes the library too in a non-catchable way. Basically this only happens with videos of 2 different resolutions that have been stitched together in one way or another. Here is the problem method:

public static bool ScanVideo(string filePath) // Return true if video is safe, false if not
{
    var first = true;
    ImageData firstFrame = new ImageData();

    var file = MediaFile.Open(filePath);
    bool foundNextFrame;

    while (true)
    {
        ImageData frame;
        try
        {
            // EXCEPTION HERE
            foundNextFrame = file.Video.TryGetNextFrame(out frame);
        }
        catch
        {
            return false;
            // Considering FFmpeg had an error, Discord will more than likely crash
        }
        if (!foundNextFrame)
            break;
        if(first)
        {
            firstFrame = frame;
            first = false;
        }

        if (frame.ImageSize.Width != firstFrame.ImageSize.Width || frame.ImageSize.Height != firstFrame.ImageSize.Height)
        {
            // Discord will crash
            return false;
        }
    }

    return true;
}

Any help would be much appreciated! In case anyone would like to try this out for themselves, this is the video I've been testing with.