I'm going to call this a bug in gst-plugins-good1.0 too. Because it sounds like libvpx is failing to use transparency in libgstvpx.so, yet working in FFmpeg (ffmpeg -c:v libvpx-vp9).
I'm going to call this a bug in gst-plugins-good1.0 too. Because it sounds like libvpx is failing to use transparency in libgstvpx.so, yet working in FFmpeg (ffmpeg -c:v libvpx-vp9).