A function that will be called when a (considered oldest) buffer can be muxed. If all pads have reached EOS, this function is called with %NULL @buffer and %NULL @data.
%GST_FLOW_OK for success
See Implementation
A function that will be called when a (considered oldest) buffer can be muxed. If all pads have reached EOS, this function is called with %NULL @buffer and %NULL @data.