Gstreamer Demo with udp src

[darvin]

I try to start a demo stream based on gst-launch-1.0. It is a udp H.264 stream by using a udpsink host=<IP> port=12345 and it can be shown on the desktop. So the udp pipeline works.

Now I load the GStreamer.dproj located at RVMediaFMX\Demos\Delphi.FMX\Cameras\GStreamer. The gst-libs are loaded properly. In the window I click on [Add...] and enter the video source "udp://127.0.0.1:12345" and video source H264. But nothing happens. Same happens if I try it by using "rtp://127.0.0.1:12345".

I assume to use the wrong video URL string.
Please help - cause the strange thing is that this worked somehow before reinstalling Delphi on my notebook.

Thanks a lot!

[Sergey Tkachenko]

A quote from RVMedia 8 announcement:

We implemented a special processing for UDP video streams in GStreamer. There is no UDP option in DeviceType, but you can specify rvdtRTSP or rvdtHTTP, UDP will be recognized by 'udp://' in URL.
If you want to listen the specific port for UDP video stream, you can specify an empty URL host name, only a port, e.g. 'udp://:5000'.
Two formats of UDP streams are supported:
- MJPEG (if VideoFormat = rvvfMJPEG)
- H.264 (otherwise)

[darvin]

Thank you for your quick reply!

The original gst source stream is:

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gst-launch-1.0 -v videotestsrc ! video/x-raw,width=(int)1280, height=(int)720, framerate=20/1 ! videoscale ! videoconvert ! x264enc tune=zerolatency bitrate=2048 speed-preset=superfast ! rtph264pay config-interval=1 pt=96 ! udpsink host=127.0.0.1 port=[b]12345[/b]

We started the Demo project GStreamer both on VLC and FMX subdirectory, started the program and entered

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udp://:12345

But nothing happened?!

A start of

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gst-launch-1.0 -v udpsrc port=12345 caps = "application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)H264, payload=(int)96" ! rtph264depay ! decodebin ! videoconvert ! autovideosink sync=false

works properly as expected! The libraries are loaded correct and the program shows no error.

Whats wrong here?

[darvin]

Ok, I found the problem. The gstreamer library was not compatible - used the latest version 1.22 which did not work for some reasons.

I uninstalled gstreamer completely and re-installed the former version

MinGW 32-bit 1.20.5 runtime installer

.
This worked for me - the udp://:12345 video came up instantly!