Is videoscale affecting alpha value?

[Sebastian Dröge]

On Fr, 2013-12-27 at 14:24 +0100, Peter Maersk-Moller wrote:
> Hi Sebastian.
> 
> Please see comments inline.
> 
> On Mon, Dec 23, 2013 at 2:57 PM, Sebastian Dröge
> <sebastian at centricular.com>wrote:
> 
> > On Mo, 2013-12-23 at 13:55 +0100, Sebastian Dröge wrote:
> > > On Fr, 2013-12-20 at 16:29 +0100, Peter Maersk-Moller wrote:
> > > > Hi Sebastian.
> > > > Thanks for answering. Please see replies inline.
> > > > [...]
> > > Thanks for the testcase, I can reproduce this here. Interesting bug :)
> > This fixes it:
> >
> > http://cgit.freedesktop.org/gstreamer/gst-plugins-base/commit/?id=cd4602ecfa1622a8261cfb180af82af3d8ae7709
> >
> 
> Thanks for the fix. I believe the bug was first introduced in 1.2 and not
> 1.0?
> 
> Doing video mixing with Snowmix, the alpha channel does carry some
> importance :-) What is the first version of GStreamer do you think the fix
> will be in?

It will be in 1.2.2, which will be released in a few minutes :)

> Right now I'm in a bit of a mess because users of Snowmix using a newer
> Linux distro may in many cases have shiftet to GStreamer 1.2 as recommended
> and now that's kind of not working well with Snowmix, if decoding/scaling
> is involved. Difficult to find a workaround that does not include heavy CPU
> usage.
> 
> Interestingly enough, I could not replicate the bug when using
> videotestsrc, format=I420 and videoscale. Any idea why?

I don't know, sorry. I think I was able to reproduce it with
videotestsrc. The problem is in videoconvert btw, not videoscale.

-- 
Sebastian Dröge, Centricular Ltd - http://www.centricular.com
Expertise, Straight from the Source
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