v4l2src does not support progressive interlacing

[Tim Harvey]

On Fri, Oct 19, 2018 at 1:31 PM Tim Harvey <tharvey at gateworks.com> wrote:
>
> On Fri, Oct 19, 2018 at 11:57 AM Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> >
> > Le vendredi 19 octobre 2018 à 11:27 -0700, Tim Harvey a écrit :
> > > On Thu, Oct 18, 2018 at 7:32 PM Nicolas Dufresne <
> > > nicolas at ndufresne.ca> wrote:
> > > >
> > > > Hi Tim,
> > > >
> > > > this felt familiar, this issue was fixed for colorimetry recently.
> > > > I
> > > > have filed this issue and attached a patch. If you could give this
> > > > patch a try to confirm it would be nice.
> > > >
> > > > https://bugzilla.gnome.org/show_bug.cgi?id=797306
> > > >
> > >
> > > Nicolas,
> > >
> > > Thanks - I'm working on testing this but building gstreamer on my
> > > target board is proving to be challenging. I gave up trying to
> > > understand the gst-build option and am now trying to gst-uninstalled
> > > option and stuck trying to figure out how to disable gl from
> > > gst-plugins-base as that's failing to build. Hopefully I will have
> > > some feedback after banging my head against the wall a bit more.
> >
> > Thanks, let me know, and don't harm yourself please ;-D
> >
>
> Nicolas,
>
> Indeed your patch does resolve this issue of v4l2src failing to
> negotiate my interlaced pipeline. Let me know if you need me to act on
> the bug directly or anything else that is needed to get this upstream.
>

Nicolas,

Sorry, I was mistaken. The patch didn't resolve the situation... I had
an invalid build environment.

With your patch:
# media-ctl --get-v4l2 '"adv7180 2-0020":0'
                [fmt:UYVY8_2X8/720x240 at 1001/30000 field:alternate
colorspace:smpte170m]
# gst-launch-1.0 v4l2src device=/dev/video7 !
video/x-raw,format=UYVY,interlace-mode=interleaved ! jpegenc !
rtpjpegpay ! udpsink host=$SERVER port=5000
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
0:00:00.644954667  7467  0x1ae3cc0 ERROR                   v4l2
gstv4l2object.c:1942:gst_v4l2_object_get_interlace_mode: Unknown enum
v4l2_field 6
0:00:00.645201000  7467  0x1ae3cc0 ERROR                   v4l2
gstv4l2object.c:1942:gst_v4l2_object_get_interlace_mode: Unknown enum
v4l2_field 6
0:00:00.645341334  7467  0x1ae3cc0 ERROR                   v4l2
gstv4l2object.c:1942:gst_v4l2_object_get_interlace_mode: Unknown enum
v4l2_field 6
0:00:00.645476667  7467  0x1ae3cc0 ERROR                   v4l2
gstv4l2object.c:1942:gst_v4l2_object_get_interlace_mode: Unknown enum
v4l2_field 6
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
'/dev/video7' does not support progressive interlacing
Additional debug info:
gstv4l2object.c(3838): gst_v4l2_object_set_format_full ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Device wants interleaved interlacing
Execution ended after 0:00:00.004613334
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

enabling gst-debug creates a massive slew of debug. Can you tell
what's happening from the above?

Tim