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What is the gstreamer caps syntax?


What is the gstreamer caps syntax?

By : user3851627
Date : October 16 2020, 11:12 AM
hope this fix your issue What is the syntax for caps, specifying media capabilities, in gstreamer? Caps are strings that specify the type of media allowed and look like "audio/x-raw-int,..." but I haven't been able to find good documentation on exactly what is allowed in a caps string. , The syntax is:
code :


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Gstreamer mux, caps refused

Gstreamer mux, caps refused


By : mjcc
Date : March 29 2020, 07:55 AM
With these it helps Ok solved it my self: The video caps above don't contain sprop-parameter-sets which aren't needed for playback. For encoding however they are needed since various properties of the stream are encoded within these:
code :
udpsrc ! 
application/x-rtp, media=(string)video, clock-rate=(int)90000, 
encoding-name=(string)H264, 
sprop-parameter-sets= (string)\"Z0LADdkBQfsBEAAAAwAQAAADAyjxQqSA\\,aMuMTIA\\=\", 
payload=(int)96, 
ssrc (uint)2332354585, 
clock-base=(uint)1158355497, 
seqnum-base=(uint)10049 !
gstrtpjitterbuffer latency=200 ! rtph264depay ! tee name=h264Tee 

...
Gstreamer - opus caps parsing error, anyone know how to fix it?

Gstreamer - opus caps parsing error, anyone know how to fix it?


By : Vincente TranLuc
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I don't think special escaping is needed. If your pipeline is correct then this should work:
code :
gst-launch-0.10 -v gstrtpbin name=rtpbin latency=100 udpsrc caps="application/x-rtp, media=(string)audio, clock-rate=(int)48000, encoding-name=(string)X-GST-OPUS-DRAFT-SPITTKA-00, caps=(string)audio/x-opus, multistream=(boolean)false, streamheader=(buffer)<4f707573486561640101000080bb0000000000,4f707573546167731e000000456e636f6465642077697468204753747265616d6572204f707573656e63010000001a0000004445534352495054494f4e3d617564696f74657374207761766501>, ssrc=(uint)3090172512, payload=(int)96, clock-base=(uint)4268257583, seqnum-base=(uint)10001" port=5002 ! rtpbin.recv_rtp_sink_1 rtpbin. ! rtpopusdepay ! opusdec ! audioconvert ! audioresample ! alsasink device=2 name=uudpsink0 udpsrc port=5003 ! rtpbin.recv_rtcp_sink_1 rtpbin.send_rtcp_src_1 ! udpsink port=5007 host=%s sync=false async=false
import subprocess                                                                                                                                                                                  

args=[  'gst-launch-0.10',
        '-v',
        'gstrtpbin',
        'name=rtpbin',
        'latency=100',
        'udpsrc',
        'caps="application/x-rtp, media=(string)audio, clock-rate=(int)48000, encoding-name=(string)X-GST-OPUS-DRAFT-SPITTKA-00, caps=(string)audio/x-opus, multistream=(boolean)false, streamheader=(buffer)<4f707573486561640101000080bb0000000000,4f707573546167731e000000456e636f6465642077697468204753747265616d6572204f707573656e63010000001a0000004445534352495054494f4e3d617564696f74657374207761766501>, ssrc=(uint)3090172512, payload=(int)96, clock-base=(uint)4268257583, seqnum-base=(uint)10001"',
        'port=5002',
        '!',
        'rtpbin.recv_rtp_sink_1',
        'rtpbin.',
        '!',
        'rtpopusdepay',
        '!',
        'opusdec',
        '!',
        'audioconvert',
        '!',
        'audioresample',
        '!',
        'alsasink',
        'device=2',
        'name=uudpsink0',
        'udpsrc',
        'port=5003',
        '!',
        'rtpbin.recv_rtcp_sink_1',
        'rtpbin.send_rtcp_src_1',
        '!',
        'udpsink',
        'port=5007',
        'host=%s',
        'sync=false',
        'async=false',

        ]

child = subprocess.Popen(args, stdout=subprocess.PIPE)
streamdata = child.communicate()[0] # streamdata will contain output of gst-launch-0.10
rc = child.returncode # rc will contain the returncode of gst-launch-0.10

print streamdata
print "\nprocess returned %d" %(rc)
Using caps on videoscale element in Gstreamer C API

Using caps on videoscale element in Gstreamer C API


By : user2983084
Date : March 29 2020, 07:55 AM
I hope this helps . First of I would recommend to use gst_parse_launch(). You can create pipelines for you application like you would run via gst-launch-1.0. You can then access individual elements by iterating or searching for them if needed - most of the stuff can be described with the pipeline string though.
For your code. You have set the caps before the scaler. Which means the scaler input should have these caps. However the ximagesrc defines the actual size. If it isn't the exact the one you have given it will fail.
why is gstreamer caps is blocking pipeline

why is gstreamer caps is blocking pipeline


By : greyrik
Date : March 29 2020, 07:55 AM
To fix the issue you can do It may be late to answer but you maybe forgot to do the dynamic pad link between some elements and you never call the on_pad_added function. I had the same problem.
Have you tried to add it since then? For example this line to dynamically link two elements instead of the gst_element_link:
Gstreamer: How to set videomixer sink_0 caps in C

Gstreamer: How to set videomixer sink_0 caps in C


By : Dowon Cha
Date : March 29 2020, 07:55 AM
will help you Here's an answer to my own question.
First caveat. I think when bad data is fetched from the camera (usually at startup) there is not enough data to file the video stream and the code segfaults. My experience is: if you run again, it will be fine.
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