mixed video background color

[Johan Basore]

Hello everyone,

I composed 2 video streams into one video. So it works well.
But the problem is that the background of mixed video is transparent.
I want a solid black background.
Is there any way?
Here are source codes and screenshots.

***********************************************************
    gst_element_link(source1, decodebin1);
    gst_element_link(source2, decodebin2);
    
    g_signal_connect(decodebin1, "pad-added",
G_CALLBACK(on_pad_added_video1), clrspace1);
    g_signal_connect(decodebin2, "pad-added",
G_CALLBACK(on_pad_added_video2), clrspace2);

    gst_element_link_many(clrspace1, videoscale1, filter1, videomixer, nil);
    gst_element_link_many(clrspace2, videoscale2, filter2, videomixer, nil);
    gst_element_link_many(videomixer, outfilter, clrspace, h264enc,
mpegtsmux, sink, nil);
***********************************************************
<http://gstreamer-devel.966125.n4.nabble.com/file/n4677353/videomixer.png> 

Thanks



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