Using Gstd
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The following is an example of how to insert metadata and receive a signal using gstd and the GstOBU plugin. Make sure you have gstd plugin to perform this example.
Start the Gstd daemon:
gstd -e
Create the pipeline inserting and extracting metadata
gst-client pipeline_create test videotestsrc is-live=true ! av1enc cpu-used=8 ! obuinject metadata="Hello-World" ! obuextract signal-new-metadata=true name=extract ! av1dec ! xvimagesink sync=false async=true
Expect for the signal:
gst-client signal_connect test extract new-metadata
In other terminal, play the pipeline:
gst-client pipeline_play test
The signal will be receive with and will show the size of the injected message and the data as a gpointer. The expected output similar to:
{
"code" : 0,
"description" : "Success",
"response" : {
"name" : "new-metadata",
"arguments" : [
{
"type" : "GstObuExtract",
"value" : "(GstObuExtract) extract"
},
{
"type" : "guint",
"value" : 11
},
{
"type" : "gpointer",
"value" : "((gpointer) 0x7f0c4ffb9d60)"
}
]
}
}
Stop the pipeline and kill the Gstd daemon
gst-client pipeline_stop test gstd -k