Re: Kernel error "Unknown pixelformat 0x00000000" occurs when I start capture video

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Tuesday, 8 January 2019 17:16:21 EET Mauro Carvalho Chehab wrote:
> Em Tue, 08 Jan 2019 16:54:41 +0200 Laurent Pinchart escreveu:
> > On Tuesday, 8 January 2019 16:45:37 EET Mauro Carvalho Chehab wrote:
> >> Em Sun, 6 Jan 2019 01:05:16 +0500 Mikhail Gavrilov escreveu:
> >>> Hi folks!
> >>> Every time when I start capture video from external capture card
> >>> Avermedia Live Gamer ULTRA GC553
> >>> (https://www.avermedia.com/gaming/product/game_capture/live_gamer_ultr
> >>> a_gc553)
> >> 
> >> What's the driver used by this device?
> >> 
> >> A quick browsing at the Avermedia page you pointed, it indicates that
> >> this should be using the UVC driver:
> >> 
> >> 	"The LGU takes full advantage of UVC technology, which
> >> 	 basically standardizes video drivers across Windows and Mac.
> >> 	 In other words, all you need to do is plug your LGU to
> >> 	 your PC or Mac and it’s ready to record and stream."
> >> 
> >> So, I *suspect* that it uses the uvcvideo driver, but better to
> >> double check.
> > 
> > Given the full kernel log part of the original message,
> > 
> > [    5.184850] uvcvideo: Unknown video format
> > 30313050-0000-0010-8000-00aa00389b71
> 
> Hmm... according with:
> 	https://gix.github.io/media-types/
> 
> It seems to be this one ('P010'):
> 
> {30313050-0000-0010-8000-00AA00389B71} (MFVideoFormat_P010)MFMS
> {30313050-0000-0010-8000-00AA00389B71} (MEDIASUBTYPE_P010)DSMS
> 
> YUV planar 4:2:0 10 bits.
> 
> If so, there's a description here:
> 
> 	https://docs.microsoft.com/en-us/windows/desktop/medfound/10-bit-and-16-bit
> -yuv-video-formats

That seems to match. The problem should then be easy to fix, but we need to 
add a corresponding fourcc to the V4L2 API, and matching documentation. Any 
volunteer ? :-)

-- 
Regards,

Laurent Pinchart