[Bug 741420] videopool: should reset buffer size to buffer pool as video alignment will change buffer size

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741420
  GStreamer | gst-plugins-base | 1.4.1

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2014-12-15 02:43:03 UTC ---
Ok, I understand this one is rather critical as it makes a GstVideoPool useless
in the context where it has been video aligned. A real life example:

source ! avdec_videcodec ! element_with_videopool

This will result in continuous reallocation of buffers. Clearly the size should
be kept in sync. My only concern is again the _set_config() documentation and
the negotiation pattern describe there. I apology for the delay, there is a
slightly lack in the design around these. I wonder if GstV4l2BufferPool isn't
already doing this behind the scene, as I have not observed this issue, even
though the drivers rarely use prescribed alignment.

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