Tries to find what type of data is contained in the given [gst::Buffer][crate::gst::Buffer], the
assumption being that the buffer represents the beginning of the stream or
file.
Tries to find if type of media contained in the given [gst::Buffer][crate::gst::Buffer], matches
caps specified, assumption being that the buffer represents the beginning
of the stream or file.
Tries to find what type of data is contained in the given [gst::Buffer][crate::gst::Buffer], the
assumption being that the buffer represents the beginning of the stream or
file.
Tries to find if type of media contained in the given data, matches the
caps specified, assumption being that the data represents the beginning
of the stream or file.