[Bug 796769] ksvideosrc: fails to initialize Datapath VisionRGB-E2S

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796769

--- Comment #9 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Sorry, I guess I need to wake up a little. So, according to
https://docs.microsoft.com/en-us/windows/desktop/directshow/uncompressed-rgb-video-subtypes
RGB8 is a 8 bit palette format, no wonder no one cared integrating that. I
think it's fine to ignore that part.

Ok this time looking at the logs you provided, the selected format is odd:

 video/x-raw, format=(string)YUY2, width=(int)2048, height=(int)4096,
framerate=(fraction)10000/1, pixel-aspect-ratio=(fraction)12/11

It's probably a bug in the constraint calculated by ksvideosrc. The problem
being pixel-aspect-ratio (not-negotatiated) but the framerate would make
everything unusable, also I doubt the capture will work if the resolution does
not match the remotely connected device (but the device may be scaling, I don't
know).

So I'd check this up with the following caps filter:

  ksvideosrc !
video/x-raw,width=1920,height=1080,pixel-aspect-ratio=1/1,framerate=60/1 ! ...

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