GitLab

Likely extremely bitrotten, and we should not ship this anyway.

Fixes "clang: error: argument unused during compilation: '-pthread'"

GST_PKG_CONFIG_PATH is used in docs/plugins directory, so
AG_GST_PKG_CONFIG_PATH must be called to set it.

https://bugzilla.gnome.org/show_bug.cgi?id=768787

Most of those have V4L2 drivers these days enabling it make sure that it
this code is enabled in major distribution, hence that HW accelerated
decoder/encoder can be used on platforms that support it. The probes are
slightly increasing the first init of gstreamer library, though the
result is cached in the registry for later use.

While this is more useful for libraries, some of our plugins with multiple
files and some internal API can also benefit from this.

https://bugzilla.gnome.org/show_bug.cgi?id=750709

With the VPX decoders it's not simple to use downstream buffer pool,
because we don't know the image size and alignment when buffers get
allocated. We can though use GstAllocator (for downstream, or the system
allocator) to avoid a copy before pushing if downstream supports
GstVideoMeta. This would still cause a copy for sink that requires
specialized memory and does not have a GstAllocator for that, though
it will greatly improve performance for sink like glimagesink and
cluttersink. To avoid allocating for every buffer, we also use a
internal buffer pool.

https://bugzilla.gnome.org/show_bug.cgi?id=745372

If something in /dev/video* get added, removed or replaced, we need to
probe the devices again in order to ensure the dynamic devices are up to
date.

https://bugzilla.gnome.org/show_bug.cgi?id=758085

https://bugzilla.gnome.org/show_bug.cgi?id=756870

https://bugzilla.gnome.org/show_bug.cgi?id=753670

This is only required for builds from git, people can still
build tarballs if they only have older autotools.

https://bugzilla.gnome.org//show_bug.cgi?id=747624