the accept caps query
the buffer allocation properties
the bitrate query (since 1.16)
query available media for efficient seeking.
the caps query
query the pipeline-local context from downstream or upstream (since 1.2)
convert values between formats
a custom application or element defined query.
wait till all serialized data is consumed downstream
total duration of the stream
query supported formats for convert
current jitter of stream
latency of stream
current position in stream
current rate of the stream
the scheduling properties
seeking capabilities
segment start/stop positions
Query stream selection capability.
unknown query type
query the URI of the source or sink.
Standard predefined Query types