Multifilesink messages and unclear doc

[pisymbol .]

The doc states the following:

"If the post-messages
<https://gstreamer.freedesktop.org/documentation/multifile/multifilesink.html#multifilesink:post-messages>
property is TRUE
<https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS>,
it sends an application message named GstMultiFileSink after writing each
buffer.

The message's structure contains these fields:

   - int <https://docs.python.org/3/library/functions.html#int> *filename:
   the filename where the buffer was written.
   - int <https://docs.python.org/3/library/functions.html#int> index:
   index of the buffer.
   - int <https://docs.python.org/3/library/functions.html#int> timestamp:
   the timestamp of the buffer.
   - int <https://docs.python.org/3/library/functions.html#int> stream-time:
   the stream time of the buffer.
   - int <https://docs.python.org/3/library/functions.html#int>
   running-time`: the running_time of the buffer.
   - int <https://docs.python.org/3/library/functions.html#int> duration:
   the duration of the buffer.
   - int <https://docs.python.org/3/library/functions.html#int> offset: the
   offset of the buffer that triggered the message.
   - int <https://docs.python.org/3/library/functions.html#int> offset-end:
   the offset-end of the buffer that triggered the message"

Source:
https://gstreamer.freedesktop.org/documentation/multifile/multifilesink.html?gi-language=python#properties

But when my pipeline runs, the message I see on the bus is
Gst.MessageType.ELEMENT with the message.src set to a GstMultiFileSink.

Where can I get the application specific data? I need a callback after
every capture file is written via multifilesink.

Thanks!

-aps
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/gstreamer-devel/attachments/20190614/efce3da6/attachment.html>