[Bug 679522] isomp4: Export transformation matrix

Sat May 31 05:43:05 PDT 2014

https://bugzilla.gnome.org/show_bug.cgi?id=679522
  GStreamer | gst-plugins-good | git

--- Comment #27 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-05-31 12:43:02 UTC ---
(In reply to comment #26)
> That's IMHO a problem of cluttersink. If the overlay composition needs to be
> rotated or not should be independent of the transformation matrix of the video
> (it should have its own metadata for the orientation).

I'm not convinced by this. I think sub-titles should render in the same
direction the video is. I think there is a relation to make. If the image is
recorded 90 degree, hence has a transformation (right now an orientation tag),
the renderer of the overlay should take this into account. Otherwise you'll
never get these straight and readable, and most likely not at the centre and
slightly outside the screen. Though, I agree that if offloading though
composition meta, it might be more flexible to make it so it have its own
transformation (99% of the time will be a copy of the original). Though, right
now we don't have a transformation matrix meta, we have a tag, which apply to
all buffers, including the buffer in the composition meta. That would be my
interpretation.

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