matroskademux: Defer seeks received before GST_MATROSKA_READ_STATE_DATA
This patch enables matroskademux to receive seeks before it reaches GST_MATROSKA_READ_STATE_DATA. This fixes the following regression:
This also enables receiving seeks in the element READY state.
When such a seek is received, it is stored to be later handled when GST_MATROSKA_READ_STATE_DATA is reached.
Edited by Alicia Boya García