[PATCH 0/5] MR61: winegstreamer: Dynamic transform stream format change support.

[Rémi Bernon (＠rbernon)]

Compared to last attempt, I moved the format pointer to a dedicated `wg_transform_read_data` parameter instead of a property of the sample. Most of the transforms use `NULL` there as they don't expect or support format change. H264 decoder passes a transform format member where it tracks the current stream format.