OBS Studio 28 no longer supports Windows 7, 8, or 8.1, and Qt 6 will
fail to run on those versions. Users on those systems being offered the
update will end up in a state where OBS will not run if they install the
update. Let's prevent the updater executable from running on those
versions to avoid that scenario.
Do to multithreading the update process, files of the same hash can
sometimes collide due to race. Ensure the filenames are all unique by
appending an incremented value for each file.
Request / response latency dominates the download time of small
files and patches, especially the locale files. Increasing this to
4 doesn't consume many more resources and basically doubles the
download speed, especially on higher latency connections.
Unfortunately WinHTTP doesn't support multiplexing with HTTP2, but there
is still some minor benefit to enabling it. Windows 10 21H1 will enable
TLS 1.3 client support in Schannel, so let's get ready for it.
On a modern Windows OS, you can rename an in-use file despite not being
able to write to it. With the introduction of the virtual camera, it is
now quite common that users will have in-use files when updating. This
commit renames in-use files, allowing the new version to be installed.
Upon a reboot, the previously in-use file will be deleted.
Adds a virtual camera button to the main user interface. If virtual
camera is not installed, it will not add the button. On Windows, it
detects whether the virtual camera filters are properly registered, and
will only add the button if the virtual camera filter is confirmed
registered.
Also adds a virtual camera option to the auto-configuration wizard,
which will just simply set the user's resolution/scale to 1920x1080 at
30 FPS.
In rare cases, "runas" would somehow launch the updater as a non-admin user
again, resulting in a loop where the updater constantly spawns processes.
Fixes https://github.com/obsproject/obs-studio/issues/2984
A long standing lack of synchronization on the elevated process handle
made the non-elevated process always exit, so the updater would assume
it was started elevated and launch OBS from the elevated context.
Also applies the altered working directory to the non-elevated code
path so it can find the OBS executable properly.
derrod