Using videomixer and alpha channel

[Sebastian Dröge]

On Di, 2013-11-26 at 13:19 -0200, Lautaro Woites wrote:
> Hi Eric,
>              I had the same problem on gst 0.10. My pipeline had a
> videomixer with 2 inputs (an mkv file and a png with alpha).
> My solution was to fix all the mixer's input caps to  "video/x-raw-rgb,
> alpha=255".

That's only accidentially working for you and is the problem I mentioned
first. A converter dropping the alpha channel before videomixer. What
you tell it there is to create a RGB stream with alpha in the first byte
of each pixel.

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