I forgot to mention that FFmpeg supports ZMQ (although it has to be
enabled in the build). To encode and send your desktop as a test, try
the following:
ffmpeg -video_size 1920x1080 -framerate 25 -f x11grab -i :0.0 -f alsa -i
pulse -c:v libx264 -preset ultrafast -pix_fmt yuv420p -profile:v high
-level 4.0 -f mpegts -muxrate 16085561 zmq:tcp://10.0.1.116.1234
You have to match the muxrate to your DTV flow graph TS bitrate.
Ron
On 4/4/21 02:50, Ron Economos wrote:
The ZMQ blocks seem to work well.
https://wiki.gnuradio.org/index.php/Understanding_ZMQ_Blocks
The required IP address at both ends is the address of the source. For
example:
tcp://10.0.1.116:1234
Here's what I'm running right now as a test. The first flow graph is
running locally on host 10.0.1.116 and the second flow graph is
running remotely on another host. The source is a file, so the
appropriate blocks are the REP sink and the REQ source. That way, the
REQ source only requests the data it needs and the connection is
throttled.
For a camera or other real-time feed, the PUSH and PULL blocks should
be used instead since the camera or real-time feed itself will be
throttling the connection.
Ron
On 4/4/21 00:53, Ralf Gorholt wrote:
Hi Marcus,
as I have written, I have tried to use a UDP source (and to connect it
to a UDP sink with a different IP address and port) but it does not seem
to work. As I am quite new to GNU radio, I have certainly made a mistake
somewhere. If I only needed a TS source (no matter which one) I could
stick with a file. I have already done that and it worked.
Could somebody please direct me to the documentation where the basic
principle of how GNU Radio works is explained? I know that there are
blocks that you can connect together but there must be a "controller"
somewhere and I would like to understand how this controller works and
how the blocks are called. What I have read until now does not answer my
questions :-)
Happy Easter,
Ralf
Am 03.04.2021 um 21:52 schrieb Marcus D Leech:
If you want VLC to produce a stream and Gnu Radio to consume it, you
need a UDP *source* rather than a *sink*.
Sent from my iPhone
On Apr 3, 2021, at 3:48 PM, Ralf Gorholt <[email protected]> wrote:
Dear all,
instead of using a file source, I would like to get data from a video
stream into GNU Radio. Is this possible?
With VLC, I can connect to the stream using a URL like
udp://230.0.0.10:1234. How can I do this in GNU Radio? I have tried to
use a UDP source with this address and payload size 1316 (needed
for VLC
when it connects to a UDP sink in GNU Radio) and to pass the data to a
UDP sink at address 230.0.0.20:10000 and payload size 1316 to which I
can connect with VLC to see if it works but when I start the flow
graph,
nothing seems to come out, VLC tries in vain to connect.
Thank you very much and happy easter!
Kind regards,
Ralf
