gstpad: Don't spam INFO when default-chaining a buffer list
This is being logged for each buffer, so it should not use INFO.
I suspect the reason why it's INFO is so that it's noticed more readily, but this has been the behaviour for a very long time, so I don't think it's going to surprise anyone today if the buffer list is pushed out as separate buffers when there's no chain impl.
Else, we could add something like a GST_INFO_ONCE()
, similar to g_warning_once()
.