multimedia/video/recorder example shows a gstreamer error at startup and "streaming stopped"

 Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
"DBUS_SESSION_BUS_ADDRESS" "unix:path=/run/user/0/dbus_session_socket"
"FB_MULTI_BUFFER" "2"
"QTWEBENGINE_DISABLE_SANDBOX" "1"
"QT_IM_MODULE" "qtvirtualkeyboard"
"QT_QPA_EGLFS_FORCEVSYNC" "1"
"QT_QPA_EGLFS_KMS_ATOMIC" "1"
"QT_QPA_EGLFS_KMS_CONFIG" "/etc/kms.conf"
"QT_QPA_PLATFORM" "eglfs"
"QT_WAYLAND_HARDWARE_INTEGRATION" "linux-dmabuf-unstable-v1"
"WAYLAND_DISPLAY" "/run/wayland-0"
"XDG_RUNTIME_DIR" "/run/user/0"
"/usr/examples/multimedia/video/recorder/recorder" QList()
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
QGstElement: failed to query position
QGstPipeline: failed to query position, using previous position
QGstreamerMediaCapture: received error from gstreamer Failed to allocate required memory. ../gst-plugins-good-1.20.7/sys/v4l2/gstv4l2src.c(777): gst_v4l2src_decide_allocation (): /GstPipeline:mediaCapturePipeline/GstBin:camerabin/GstV4l2Src:camerasrc:
Buffer pool activation failed
QGstreamerMediaCapture: received error from gstreamer Internal data stream error. ../gstreamer-1.20.7/libs/gst/base/gstbasesrc.c(3127): gst_base_src_loop (): /GstPipeline:mediaCapturePipeline/GstBin:camerabin/GstV4l2Src:camerasrc:
streaming stopped, reason not-negotiated (-4)