On Windows, if the path to gst-plugin-scanner.exe contained
whitespace, gstreamer would via CreateProcessW attempt to execute
several files "up" the path tree; e.g. if the scanner path was
"C:\Program Files\gstreamer app\gst-plugin-scanner.exe", it would try
to execute C:\Program, C:\Program.exe, C:\Program Files\gstreamer.exe"
and so on.
This is how CreateProcessW behaves with unquoted whitespace arguments
in lpCommandLine if lpApplicationName is NULL.
By passing the binary path as lpApplicationName instead, the problem
is avoided.
Also quote arguments to gst-plugin-scanner.exe as they are paths as well.
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8614>
External plugin loader support for Windows is introduced
in this dev cycle. Since helper binary was not required (useless)
before this version, people may not ship the binary
with new GStreamer version, then they will observe warning message.
Instead of displaying the warning at plugin loading time,
checks helper bin earlier and disable external plugin loader
if helper binary is not installed.
Fixes: https://gitlab.freedesktop.org/gstreamer/cerbero/-/issues/448
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6083>
Usually gst-plugin-scanner.exe will be located under libexec/gstreamer-1.0
or even somewhere user specified location via GST_PLUGIN_SCANNER
environment. So, in order for child process to be able to load
GStreamer DLLs, parent process will need to update PATH env
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3886>
