[gstreamer-bugs] [Bug 431252] Very simple & universal way to make serious hw acceleration.

[GStreamer (bugzilla.gnome.org)]

If you have any questions why you received this email, please see the text at
the end of this email. Replies to this email are NOT read, please see the text
at the end of this email. You can add comments to this bug at:
  http://bugzilla.gnome.org/show_bug.cgi?id=431252

  GStreamer | don't know | Ver: HEAD CVS

Jan Schmidt changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thaytan at mad.scientist.com




------- Comment #9 from Jan Schmidt  2007-05-24 14:23 UTC -------
The problem with the approach in the example code above is that glReadPixels is
notoriously slow. On modern cards with a PCI-X bus, it's less so, but on older
cards, reading back from the gfx card has always been a slow process. 

It's certainly not feasible to read the frames back and forth for several
processing steps - it very quickly saturates the bus.

In general, I think we can concoct a method where a glxcontext is passed
between elements using buffer_alloc somehow though, so that multiple processing
steps can be performed in a chain with the results being read back at the end,
either by an element which has the job of allocated the glx context and passing
it upstream, then reading the pixels at the end, or by having each element in
the chain recognise that downstream wants image/x-raw-rgb and taking the task
on itself.


-- 
See http://bugzilla.gnome.org/page.cgi?id=email.html for more info about why you received
this email, why you can't respond via email, how to stop receiving
emails (or reduce the number you receive), and how to contact someone
if you are having problems with the system.

You can add comments to this bug at http://bugzilla.gnome.org/show_bug.cgi?id=431252.