There is a problem when v4l2src + compositor

[uil uil]

Thanks for your replies.

I try to set start-time-selection to first. It can output the video now
with 10fps, which is 30fps.

And i found that this problem only occurs in the input video with HD. When
it change to FHD or other resolution,
It can output as the input fps normally.

I am confused now, why does FHD work?🙃

I will try it on 1.18.2.



Nicolas Dufresne <nicolas at ndufresne.ca> 于2021年4月15日周四 上午4:28写道：

> Le mardi 13 avril 2021 à 22:14 -0500, inaho330 a écrit :
> > Hi
> >
> > I make a program which pipeline like this:
> >
> > gst-launch-1.0 v4l2src  ! video/x-raw,format=YV12,width=1280,height=720 !
> > timeoverlay  ! queue  ! videomixer ! vaapih264enc rate-control=vbr
> > bitrate=1000 ! video/x-h264 ! h264parse config-interval=1  ! mpegtsmux !
> > udpsink host=172.16.6.109 port=23333
> >
> > It work fine. But If I use compositor instead of videomixer like this:
> >
> > gst-launch-1.0 v4l2src  ! video/x-raw,format=YV12,width=1280,height=720 !
> > timeoverlay  ! queue  ! compositor ! vaapih264enc rate-control=vbr
> > bitrate=1000 ! video/x-h264 ! h264parse config-interval=1  ! mpegtsmux !
> > udpsink host=172.16.6.109 port=23333
> >
> > The compositor just only output the first frame it get .
>
> Works here on 1.18.2, but the start is bursty, which I can fix adding
> start-
> time-selection=first to the compositor. That's because v4l2src is live and
> the
> very first timestamp isn't going to be zero. My camera is pretty fast to
> start,
> but I've seen UVC camera taking up to 10s to start.
>
> >
> > But if i use videotestsrc or appsrc , it work fine.
> >
> > Does anyone know where the problem is?
> > Is there any way to debug it?
> >
> > THanks!
> >
> >
> >
> > --
> > Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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