Only first frame drawn gst-rtsp-server

[Shishigami]

I'm on Windows 10 using Gstreamer 1.16.1.

I'm trying to run two pipelines in parallel. Sender gets data from appsrc
(OpenCV) and writes them to UDP sink:

appsrc is-live=true format=time ! videoconvert ! video/x-raw, format=I420 !
x264enc speed-preset=superfast tune=zerolatency byte-stream=true
key-int-max=15 ! rtph264pay pt=96 config-interval=5 ! udpsink sync=false
host=localhost port=8553

Receiver reads from UDP source and uses gst-rtsp-server to provide an RTSP
stream:

udpsrc address=localhost port=8553 caps="application/x-rtp,
clock-rate=90000, payload=96" ! rtpjitterbuffer ! rtph264depay ! rtph264pay
name=pay0 pt=96

Opening the stream in VLC media player, the resulting frame from OpenCV does
show up, but it never changes. In Unreal Engine (target environment) the
stream opens fine, but it only shows a gray image.

I'm not sure if this is related, but I set GST_DEBUG and get the following
output from gst-rstp-server:

0:00:03.329599300  6124 0000024F68D88700 FIXME              rtspmedia
rtsp-media.c:4168:gst_rtsp_media_suspend: suspend for dynamic pipelines
needs fixing
0:00:03.329990500  6124 0000024F68D88700 WARN               rtspmedia
rtsp-media.c:4194:gst_rtsp_media_suspend: media 0000024F68DB3220 was not
prepared
0:00:03.339047900  6124 0000024F68D88700 FIXME             rtspclient
rtsp-client.c:1818:handle_play_request:<GstRTSPClient at 0000024F68D89850> Add
support for seek style (null)
0:00:03.339776300  6124 0000024F68D88700 FIXME              rtspmedia
rtsp-media.c:2684:gst_rtsp_media_seek_full:<GstRTSPMedia at 0000024F68DB3220>
Handle going back to 0 for none live not seekable streams.

I tried using fpsdisplaysink with the following pipeline (instead of
receiver) and that works:

gst-launch-1.0 -v udpsrc address=localhost port=8553
caps="application/x-rtp,clock-rate=90000,payload=96" ! rtpjitterbuffer !
rtph264depay ! decodebin ! videoconvert ! fpsdisplaysink

But the FPS is pretty bad, averaging at 2.29, which is a far cry from the 30
FPS I'm looking to achieve:
last-message = rendered: 240, dropped: 0, current: 2.25, average: 2.29

Why does it work with fpsdisplaysink but not RTSP? I'd highly highly
appreciate any help!



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