unable to record desktop using latest gstreamer in ubuntu 22.04

I can broadcast my desktop to a rtmp server successfully using

> ```
> gst-launch-1.0 ximagesrc use-damage=0 show-pointer=false !
> video/x-raw,framerate=30/1 ! videoconvert ! queue ! x264enc ! queue !
> flvmux name=mux ! queue ! progressreport ! queue ! rtmpsink sync=false
> async=true location="rtmp://xxxxxx" pulsesrc do-timestamp=true
> device="alsa_output.pci-0000_00_1b.0.analog-stereo.monitor" ! queue !
> audioconvert ! queue ! voaacenc bitrate=128000 ! queue ! mux.
> ```
>


But If I try to do same using hw acceleration vaapi then it does not work
!!

```
> gst-launch-1.0 ximagesrc use-damage=0 show-pointer=false !
> video/x-raw,framerate=30/1 ! videoconvert ! queue ! vaapih264enc
> dct8x8=true cabac=true rate-control=cbr bitrate=1000 keyframe-period=30
> max-bframes=1 ! queue ! flvmux name=mux ! queue ! progressreport ! queue !
> rtmpsink sync=false async=true location="rtmp://xxxx" pulsesrc
> do-timestamp=true
> device="alsa_output.pci-0000_00_1b.0.analog-stereo.monitor" ! queue !
> audioconvert ! queue ! voaacenc bitrate=128000 ! queue ! mux.
> ```
>

It is just stuck at below if i use hw acceleration:

> letting pipeline to PAUSED ... Pipeline is live and does not need
> > PREROLL ... Got context from element 'vaapiencodeh264-0':
> > gst.vaapi.Display=context,
> > gst.vaapi.Display=(GstVaapiDisplay)"\(GstVaapiDisplayGLX\)\
> > vaapidisplayglx0"; Pipeline is PREROLLED ... Setting pipeline to
> > PLAYING ... Redistribute latency... New clock: GstPulseSrcClock
>