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I want to play 2 video files using a GStreamer pipeline on my screen. The first video is without an embedded alpha channel and I want the second video with an embedded alpha channel to be overlaid over the first one.

The alpha plugin seems to be for adding an alpha channel to a video stream initially lacking it, but it's not what I want. How do I compose videos with embedded alpha channels in gstreamer?

Here are 2 samples: betina.flv (A420 color format) and betina.mov (BGRA color format).

My task is not to create such files but to overlay them on top of plain non-alpha movies.

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  • So you want to do something like this? jakearchibald.com/scratch/alphavid but with gstreamer?
    – justbrowsing
    Sep 8, 2013 at 0:39
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    And over another video as opposed to a static background image. BTW the .ogv file there seems to have an alpha channel embedded so if it turns out to be true the part of my question about video samples is answered.
    – nponeccop
    Sep 8, 2013 at 9:17

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You will want to use videomixer, I just added auto conversion support with respect to alpha channels, it is in git master but not yet released.

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    can you please elaborate on why should the QA choose that software over another? what are its key features? also, please be clear if you used it before and if you had a positive experience.
    – Lorenzo Von Matterhorn
    Sep 14, 2013 at 18:36
  • OP asked a question about gstreamer, not sure I need to market it to him.
    – Mathieu_Du
    Sep 15, 2013 at 14:29
  • its not about marketing. check here: meta.superuser.com/questions/5329/…
    – Lorenzo Von Matterhorn
    Sep 15, 2013 at 14:46
  • I'm not recommending software, I'm explaining how to achieve his goal with the software he already uses.
    – Mathieu_Du
    Sep 15, 2013 at 15:15
  • @LorenzoVonMatterhorn: I explicitly stated in my question that I'm only interested in gstreamer-based solutions, so no software recommendations is taking place. MathieuDu: your pipeline generates a Y444 movie without an alpha channel so it's not helpful. I added examples of movies with embedded alpha to my question.
    – nponeccop
    Sep 15, 2013 at 19:15

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