v4l2src does not support progressive interlacing

[Tim Harvey]

On Mon, Oct 29, 2018 at 11:58 AM Tim Harvey <tharvey at gateworks.com> wrote:
>
> On Mon, Oct 29, 2018 at 11:56 AM Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> >
> >
> >
> > Le lun. 29 oct. 2018 18 h 32, Tim Harvey <tharvey at gateworks.com> a écrit :
> >>
> >> On Sun, Oct 28, 2018 at 3:44 PM Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> >> >
> >> >
> >> >
> >> > Le dim. 28 oct. 2018 20 h 43, Antoine Villeret <antoine.villeret at gmail.com> a écrit :
> >> >>
> >> >> hi Nicolas,
> >> >>
> >> >> as far as i understand v4l2-compliance output (https://gist.github.com/avilleret/0eb894d58612d91aba7ab81f9d823dbf)
> >> >> bttv driver does support TRY_FMT
> >> >> but I might be wrong
> >> >>
> >> >> on the other side, I made further test with your path, and it seems to work.
> >> >> 'it seems' because strangely a test pipeline abord with the output you've already look at.
> >> >> But my program (based on OpenFrameworks) does work with your patch while it didn't with gstreamer 1.14 from Ubuntu 18.04 repo.
> >> >> I don't know actually what trigs the error you see and why the test pipeline abord before displaying anything,
> >> >> maybe I miss some extensions/plugins.
> >> >
> >> >
> >> > Ok, so it seems like the patch does something. I'll reread with the assumption TRY_FMT isn't supported, I might better understand. I always believed that without that, it would always fail.
> >> >
> >> >>
> >> >> Thanks for your time, and I might make further test tomorrow if you need.
> >> >>
> >>
> >> Nicolas,
> >>
> >> Did you receive the log I sent you regarding my experience with this
> >> issue? I can send again if needed.
> >>
> >> Regards,
> >
> >
> > I haven't I believe. Maybe the ML have eaten it, was it big ?
>
> I sent it off-list... it probably went to your spam :)
>
> I've attached it (135K) here.
>
> Tim

Nicolas,

Sorry to resurrect a fairly dated thread but this issue still exists
using gstreamer master.

root at imx6q-gw5404:~/gst/master# v4l2-ctl -d7 --get-fmt-video
Format Video Capture:
        Width/Height      : 720/480
        Pixel Format      : 'UYVY' (UYVY 4:2:2)
        Field             : Sequential Bottom-Top
        Bytes per Line    : 1440
        Size Image        : 691200
        Colorspace        : SMPTE 170M
        Transfer Function : Rec. 709
        YCbCr/HSV Encoding: ITU-R 601
        Quantization      : Limited Range
        Flags             :
root at imx6q-gw5404:~/gst/master# gst-launch-1.0 v4l2src
device=/dev/video7 ! video/x-raw,format=UYVY !  jpegenc ! rtpjpegpay !
udpsink host=172.24.20.19 port=5000
Setting pipeline to PAUSED ...
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
'/dev/video7' does not support progressive interlacing
Additional debug info:
gstv4l2object.c(3821): gst_v4l2_object_set_format_full ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Device wants interleaved interlacing
Execution ended after 0:00:00.003732076

I've put the GST_DEBUG log here:
https://gist.github.com/tharvey/fb3ef7ded7cb686739aeac1ba947a8ca

I've got a gstreamer devel environment handy now for testing if you
have some ideas.

Regards,

Tim

Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...