Quoting Tim Harvey (2023-07-12 00:45:10) > On Tue, Jul 11, 2023 at 3:49 PM Kieran Bingham > <kieran.bingham@xxxxxxxxxxxxxxxx> wrote: > > > > Hi Tim, > > <snip> > > > > > > Hi Adam, > > > > > > Thanks, this helped point me in the right direction and proves the > > > video capture device works with v4l2. > > > > > > For the imx219 which can capture 640x480 raw 8bit bayer: > > > # configure media entities for 8-bit raw bayer 640x480 > > > media-ctl -v -V "'imx219 3-0010':0 [fmt:SRGGB8/640x480 field:none]" > > > media-ctl -v -V "'crossbar':0 [fmt:SRGGB8/640x480 field:none]" > > > media-ctl -v -V "'mxc_isi.0':0 [fmt:SRGGB8/640x480 field:none]" > > > # configure for RGGB (8-bit bayer) 640x480 > > > v4l2-ctl --device /dev/video0 > > > --set-fmt-video=width=640,height=480,pixelformat=RGGB --verbose > > > # capture a frame > > > v4l2-ctl --device /dev/video0 --stream-mmap --stream-to=frame.raw > > > --stream-count=1 > > > convert -size 640x480 -depth 8 gray:frame.raw frame.png # convert to png > > > # stream to display > > > gst-launch-1.0 v4l2src ! \ > > > video/x-bayer,format=rggb,width=640,height=480,framerate=10/1 ! \ > > > bayer2rgb ! fbdevsink > > > > > > > I would expect if that's all working then libcamera with the ISI > > pipeline handler would be able to handle all of the media-ctl > > configuration for you. > > > > You should be able to use this directly (without needing calls to media-ctl): > > > > gst-launch-1.0 libcamerasrc ! \ > > video/x-bayer,format=rggb,width=640,height=480 ! \ > > bayer2rgb ! fbdevsink > > > > in the same way. > > > > If it does work, I'd be interested to hear that, and if it doesn't - > > then lets fix it! > > > > Note I removed the framerate=10/1 as that's the part I would suspect > > might cause issues in the libcamerasrc. It's likely worth trying both > > with and without it. > > Hi Kieran, > > I've never looked into libcamera before but I love the idea of not > needing to deal with media-ctl pipelines. I don't see a libcamerasrc Indeed, that's one of the key points of libcamera - to handle all this complexity of routing, configuration, and format propogation for every platform on behalf of each application. (As well as manage any connected ISP). There's a few out of tree patches I believe, but it doesn't take much to get libcamera running the ISP on the i.MX8MP as well so then you can have hardware accelerated debayering and image processing too. > in gstreamer 1.20.3 which I'm using. A quick look at the libcamera > docs [1] seems to indicate building from source isn't necessary when > libcamera is installed but I've installed libcamera-tools/libcamera0 > and there is still no libcamerasrc shown in gstreamer? libcamerasrc is currently built as part of the libcamera project, not gstreamer. I don't know what package libcamera-tools/libcamera0 refers to - but look to see if your distribution package the gstreamer component of libcamera separately. Once that's installed it should be available. Feel free to find us in the IRC/Matrix channels too if you get stuck for a realtime support channel to get things running. -- Kieran > > best regards, > > Tim > [1] https://libcamera.org/getting-started.html
