AW: Displaying camera not working

[Nicolas Dufresne]

Le mar. 24 avr. 2018 09:27, Iñigo Huguet <inigohuguet at fanamoel.com> a
écrit :

> I don't have playbin2, but I do have playbin.
>
> It doesn't work right now, I think it is because the driver doesn't
> report correctly its available framesizes (width X height). That's why I
> had to specify them with video/x-raw width=720,height=576
>
> There is any way to specify the framesize with playbin? If not, I will
> try to fix the driver.
>

If that is an option for you, then it's best thing to do. By the way, are
you aware of the v4l2-compliance test ? This test, which is part of
v4l2-utils helps a lot to ensure your driver is usable across most
userapace.

>
>
> El 24/04/18 a las 12:45, Bernhard Graaf escribió:
> > Have you try to use playbin2 instead?
> > Something like 'gst-launch-1.0 playbin2 uri=v4l2:///dev/video1'.
> > If its works, have a look into the log and see what playbin2 had done.
> >
> > Bernhard
> >
> > -----Ursprüngliche Nachricht-----
> > Von: gstreamer-devel [mailto:
> gstreamer-devel-bounces at lists.freedesktop.org]
> > Im Auftrag von Iñigo Huguet
> > Gesendet: Dienstag, 24. April 2018 11:13
> > An: Antonio Ospite; gstreamer-devel at lists.freedesktop.org
> > Betreff: Re: Displaying camera not working
> >
> > Hi.
> >
> > I have gotten one frame as you told me
> >
> > gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video1 !
> > video/x-raw,format=NV12,width=720,height=576 ! filesink
> > location=raw_frame.bin
> >
> > Then, in my computer, I converted it to png:
> >
> > gst-launch-1.0 -v filesrc location=raw_frame.bin ! videoparse width=720
> > height=576 format=GST_VIDEO_FORMAT_NV12 ! videoconvert ! pngenc !
> > filesink location=raw_frame.png
> >
> > I can see the .png image correctly, so it seems that the driver outputs
> > NV12. What can I try now? Maybe I need any additional plugin? (I'm using
> > a custom build using Buildroot so I don't have all plugins installed)
> >
> > El 23/04/18 a las 17:09, Antonio Ospite escribió:
> >> On Mon, 23 Apr 2018 16:26:42 +0200
> >> Iñigo Huguet <inigohuguet at fanamoel.com> wrote:
> >>
> >>> I have managed to solve a problem: it seems that the sprite was not
> well
> >>> reported by the driver (it said it was 1080 instead of 720). Now I
> think
> >>> it gives the correct values for a 720x576px NV12 frame: sprite 720,
> size
> >>> 622080
> >>>
> >>> However, I still doesn't have a good output, and I don't know what to
> do
> >>> to find what's wrong (I have no previous experience with video nor
> >>> gstreamer).
> >>>
> >>> With this pipeline: gst-launch-1.0 v4l2src device=/dev/video1 !
> >>> video/x-raw,format=NV12,width=720,
> >>> height=576 ! videoconvert ! xvimagesink sync=false
> >>>
> >>> I only get an output with very colorful lines (almost horizontal
> lines).
> >>>
> >>> I attach the output of the driver and gstreamer with
> >>> GST_DEBUG=*videosink*:6,*imagesink*:6,*v4l2*:6
> >>>
> >>> Any hint? Thanks!
> >>>
> >> If you cannot trust the driver to report the correct data format (I am
> >> thinking to the pixelformat in particular), then GStreamer videoconvert
> >> won't be able to use the caps in any meaningful way.
> >>
> >> You could analyze a raw frame to confirm that it's actually NV12.
> >>
> >> A sample pipeline which (hopefully) dumps one frame is:
> >>
> >>     gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video1 ! filesink
> > location=raw_frame.bin
> >> Upload the raw data somewhere and maybe someone will take a look
> >> if they have time.
> >>
> >> Ciao,
> >>      Antonio
> >>
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