the playback rate of the segment is set in response to a seek event and, without any seek, the value should be 1.0. This value is used by elements that synchronize buffer [running times](additional/design/synchronisation.md#running-time) on the clock (usually the sink elements), leading to consuming buffers faster (for a value > 1.0) or slower (for `0.0 < value < 1.0`) than normal playback speed. The rate also defines the playback direction, meaning that when the value is lower than 0.0, the playback happens in reverse, and the stream-time
is going backward. The rate value should never be 0.0.
Get rate field.