gst_element_set_state blocks when setting GST_STATE_NULL when using vaapisink and QWidget

[Nirbheek Chauhan]

On Wed, Nov 10, 2021 at 6:10 PM Viljar Hera <viljar.hera at gmail.com> wrote:
>
> Well because I need vaapi for hw acclerated decoding (vaapih264dec & vaapih265dec)

Vaapi can be transferred zerocopy to GL memory, so you do not need to
use a vaapi sink to do hw accelerated rendering of hw decoded buffers.

> and the project does not use qml at all.
>
> Actually I have not tested qmlglsink before. My distro (arch linux) doesn't even provide the package. So I'm not sure how well it integrates with regular QWidgets.
>

You can always render to glimagesink and render to a GL surface with
Qt. There are examples for this:

https://gitlab.freedesktop.org/gstreamer/gstreamer/-/tree/main/subprojects/gst-plugins-base/tests/examples/gl/qt

Cheers,
Nirbheek