Is videoscale affecting alpha value?

[Sebastian Dröge]

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 :)

> > Does it
> > contain an alpha channel already, and what's the size of the input
> > video?
> >
> 
> No it does not have an alpha channel when leaving decodebin. How could
> it? I haven't heard of an encoded video with an alpha track saved and
> to the best of my knowledge, decodebin can not output raw video with
> an alpha channel nor does it include videoconvert.

There are some, like VP6A or Dirac but it's uncommon, yes.

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