Map chroma_format_idc == 3 (which means 4:4:4 subsampling) correctly, also pass coded bitdepth for decoder initialization instead of inferring it from output format since they can be different. Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/949 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1612>