Update Windows installation instructions

README.md

@@ -215,22 +215,29 @@ You should change the installation to install the "Add python.exe to Path" featu
 
 2. Install Python 3.7 for Windows (https://www.python.org/downloads/release/python-374/). The Windows x86-64 MSI installer is fine. This is required in order to build the JavaScript engine, SpiderMonkey.
 
-2. Install virtualenv.
+3. Install virtualenv.
 
  In a normal Windows Shell (cmd.exe or "Command Prompt" from the start menu), do:
  ```
 pip install virtualenv
 ```
  If this does not work, you may need to reboot for the changed PATH settings (by the python installer) to take effect.
 
-3. Install the most recent [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) MSVC development package following [these instructions](https://github.com/sdroege/gstreamer-rs#gstreamer-binaries-1). Note that the MinGW binaries will not work, so make sure that you install the MSVC the ones.
+4. Install `pkg-config` either via [Chocolatey](https://chocolatey.org/install#installing-chocolatey)(`choco install pkgconfiglite`) or from [here](https://sourceforge.net/projects/pkgconfiglite/).
+
+5. Install the most recent [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) MSVC packages. You need to download the two `.msi` files for your platform from the [GStreamer](https://gstreamer.freedesktop.org/data/pkg/windows/) website and install them. The currently recommended version is 1.16.0. i.e.:
+
+- [gstreamer-1.0-msvc-x86_64-1.16.0.msi](https://gstreamer.freedesktop.org/data/pkg/windows/1.16.0/gstreamer-1.0-msvc-x86_64-1.16.0.msi)
+- [gstreamer-1.0-devel-msvc-x86_64-1.16.0.msi](https://gstreamer.freedesktop.org/data/pkg/windows/1.16.0/gstreamer-1.0-devel-msvc-x86_64-1.16.0.msi)
+
+Note that the MinGW binaries will not work, so make sure that you install the MSVC the ones.
 
 Note that you should ensure that _all_ components are installed from gstreamer, as we require many of the optional libraries that are not installed by default.
 
-4. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
+6. Install Git for Windows (https://git-scm.com/download/win). DO allow it to add git.exe to the PATH (default
 settings for the installer are fine).
 
-5. Install Visual Studio Community 2017 (https://www.visualstudio.com/vs/community/). You MUST add "Visual C++" to the
+7. Install Visual Studio Community 2017 (https://www.visualstudio.com/vs/community/). You MUST add "Visual C++" to the
 list of installed components. It is not on by default. Visual Studio 2017 MUST installed to the default location or mach.bat will not find it.
 
 ##### [Optional] Install LLVM for faster link times