Using compositor with shmsrc

[Guru Govindan]

Hi,
I have the a few pipelines that send raw video shmsink like below

```
gst-launch-1.0 videotestsrc !
video/x-raw,format=I420,width=640,height=360,framerate=15/1 ! timeoverlay !
queue ! shmsink socket-path=/tmp/test1 shm-size=20000000 sync=true

gst-launch-1.0 videotestsrc !
video/x-raw,format=I420,width=640,height=360,framerate=15/1 ! timeoverlay !
queue ! shmsink socket-path=/tmp/test2 shm-size=20000000 sync=true

```

I am trying to mux the videos using the compositor plugin in another
process like this

```
gst-launch-1.0 shmsrc socket-path=/tmp/test1 is-live=true ! queue !
video/x-raw,format=I420,width=640,height=360 ! compositor name=comp
sink_1::xpos=860 ! videoconvert ! autovideosink \
shmsrc socket-path=/tmp/test2 is-live=true ! queue !
video/x-raw,format=I420,width=640,height=360 ! comp.
```

However I get an assertion error that GST_FORMAT_TIME is not available like
below.

```
ERROR:../subprojects/gst-plugins-base/gst-libs/gst/video/gstvideoaggregator.c:2322:gst_video_aggregator_sink_event:
assertion failed: (seg.format == GST_FORMAT_TIME)
Bail out!
ERROR:../subprojects/gst-plugins-base/gst-libs/gst/video/gstvideoaggregator.c:2322:gst_video_aggregator_sink_event:
assertion failed: (seg.format == GST_FORMAT_TIME)
[1]    268025 abort (core dumped)  GST_DEBUG=4 gst-launch-1.0 shmsrc
socket-path=/tmp/test1 is-live=true !
```

Is there a way to manually add GST_FORMAT_TIME?

I tried the videomixer element and have the same issue there. I tried
inserting identity sync=true but that doesnt seem to do the trick.

I appreciate any help in this!
Thanks a lot!
Guru


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