default value of max-buffers in appsink not match documentation
In the Appsink (gst-libs/gst/app/gstappsink.c) the following define sets the default value of the max_buffers
#define DEFAULT_PROP_MAX_BUFFERS 0
In the current doc the value is
Default value : 10485760
https://gstreamer.freedesktop.org/documentation/coreelements/queue.html?gi-language=c#properties