Unable to set Capabilities on v4l2src using C
iotsystek at gmail.com
Thu Mar 18 19:05:59 UTC 2021
I am using GStreamer 1.18.2 on embedded Linux with a couple of USB cameras
and sending the video to Windows.
I have a working pipeline.
USB Cameras attached to the embedded computer using the following command
gst-launch-1.0 v4l2src device=/dev/video0 ! \
'video/x-raw, width=640, height=480' ! \
videorate max-rate=6 ! \
videoconvert ! \
x264enc pass=qual quantizer=20 tune=zerolatency ! \
rtph264pay ! \
udpsink host=192.168.168.32 port=1234
The PC receives and displays the streams with no issue.
Now I am attempting to translate the gst-launch-1.0 command into C code. I
have been totally unsuccessful in setting the capabilities ('video/x-raw,
width=640, height=480') on the v4l2src, which does not have a ‘caps’
I would be grateful for both a code snippet / example detailing the C source
code needed to do this and guidance as to where I might look to find this
kind of answer directly. Is there a repository of GStreamer version 1.0 C
Also related to the above. Once I have this working I will need to be able
to change these camera height and width capabilities.
I also have a socket connection (totally unrelated to GStreamer) to the
embedded Linux system and use it for control and feedback of additional
hardware. I will need to raise and lower the cameras width and height while
it is running via this socket connection. Will I have to totally stop the
video flow or is there a way to adjust these setting on the fly.
Again the code snippet would be greatly appreciated.
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