[Bug 721701] Performance penalty for videoscale and I420 to BGRA for 1.2.0-1.2.2 and common ubuntu

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=721701
  GStreamer | gst-plugins-base | 1.2.2

--- Comment #3 from Andoni Morales <ylatuya at gmail.com> 2014-01-07 16:07:09 UTC ---
(In reply to comment #2)
> I420 -> BGRA is not implemented correctly in 0.10, it uses the fast path but
> with the wrong color matrix and wrong chroma upsampling.
> 
> In 1.0, it is implemented correctly but uses a slow path. Implementing a fast
> path with wrong upsampling would easy to add.

But how do you explain that using the developers ppa instead of the default
version provided with Ubuntu was on par with 0.10?

I did run some tests with cachegrind comparing 0.10, 1.0 from Ubuntu and 1.2
from the developers ppa.
0.10 and 1.2 from the ppa was more or less the same number of CPU cycles
(around 20M for the colorspace conversion function) while the version from
Ubuntu was using 50M cycles more the colorspace conversion.

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