I think I have answered my own question.
I found this code in aravis/gst/gstaravis.c
gs = gst_structure_empty_new ("video");
gst_structure_set_name (gs, "video/x-raw-gray");
gst_structure_set (gs,
"bpp", G_TYPE_INT, 8,
"depth", G_TYPE_INT, 8,
"width", G_TYPE_INT, width,
"height", G_TYPE_INT, height,
NULL);
I looked elsewhere for subsequent modifications, but did not find any.
From this I concluded that aravis only supports 8-bit gray.
Thanks,
Bert Douglas
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