Duration of stream changed
Sink has received EOS
Message contains an error
A media-info property has changed, message contains current #GstPlayMediaInfo
Audio muting flag has been toggled
Sink position changed
Any pending seeking operation has been completed
State changed, see #GstPlayState
Source element was initalized for set URI
Video sink received format in different dimensions than before
The volume of the audio ouput has changed
Message contains an error
Pipeline is in buffering state, message contains the percentage value of the decoding buffer