trackobject: Implement the GESMetaContainerInterface
trackobject: Implement the GESMetaContainerInterface

cfoch/gst-editing-services,cfoch/gst-editing-services,cfoch/ges,cfoch/ges,pitivi/gst-editing-services,pitivi/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,cfoch/ges,pitivi/gst-editing-services,cfoch/gst-editing-services,pitivi/gst-editing-services