On Thu 26 September 2013 13:47:26 Steve Cookson wrote: > On 26/09/2013 08:32, Hans Verkuil wrote: > > Typically the video standard needs to be correct (e.g. PAL vs NTSC), > > and the video format produced by the video capture card must be > > supported by the application. > > > > Ask them to run 'v4l2-ctl -d /dev/video0 --all', that gives a good > > overview of the video settings/capabilities. > Hi Hans, > > Thanks for your quick response. > > Video Standard I understand, in fact I usually do it too, but what is > format, are you saying YUV or whatever?
It's how the actual pixels of the image are laid out in memory. YUV 4:4:4, YUV 4:2:0, YUV 4:1:0, planar, interleaved, RGB, etc. Run 'v4l2-ctl --help-vidcap' (if you have a sufficiently recent v4l2-ctl version) to see all the format-related options. v4l2-ctl -w --list-formats lists the supported video formats. The '-w' option makes v4l2-ctl use the libv4l2 library, which can convert obscure formats to more familiar ones. I assume gstreamer uses libv4l2 as well. See also the documentation on formats here: http://hverkuil.home.xs4all.nl/spec/media.html#pixfmt Regards, Hans -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
