Unexpectedly expensive conversion from BGRA to BGR

[Tyler Compton]

Hi everyone,

I have a pipeline that, at some point, needs to convert video frames from
BGRA to BGR. I was surprised to see about a ~17% increase in CPU usage just
from doing this conversion. I wouldn't expect it to be that expensive,
considering it's just a matter of stripping off some data for each pixel.

In my application, I have BGRA frames, but never any actual alpha
information. Is there perhaps an optimization opportunity because of that?

On average I see about 17% CPU usage when running this pipeline:

videotestsrc is-live=true !
"video/x-raw,format=BGRA,width=1920,height=1080,framerate=30/1" ! fakesink

However, I see around 38% CPU usage just by adding a videoconvert to go
from BGRA to BGR:

videotestsrc is-live=true !
"video/x-raw,format=BGRA,width=1920,height=1080,framerate=30/1" !
videoconvert ! "video/x-raw,format=BGR" ! fakesink

I'm running GStreamer 1.18.0 on Ubuntu 20.04.

Thanks,
Tyler
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