[Bug 797306] New: v4l2object: Read driver selected interlace mode

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797306

            Bug ID: 797306
           Summary: v4l2object: Read driver selected interlace mode
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is to fix a bug reported by Tim Harvey on the mailing list. His
original message was:

I've got a v4l2src capture pipeline using an interlaced video source
which used to work on GStreamer 1.8.3 that I've found no longer
negotiates on GStreamer 1.14.1:

root at bionic-armhf:~# 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 bionic-armhf:~# gst-launch-1.0 --version
gst-launch-1.0 version 1.14.1
GStreamer 1.14.1
https://launchpad.net/distros/ubuntu/+source/gstreamer1.0
root at bionic-armhf:~# gst-launch-1.0 v4l2src device=/dev/video7 !
video/x-raw,format=UYVY ! 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
ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Device
'/dev/video7' does not support progressive interlacing
Additional debug info:
gstv4l2object.c(3768): gst_v4l2_object_set_format_full ():
/GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
Device wants interleaved interlacing
Execution ended after 0:00:00.003064667
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

Any idea what changed here that causes this?

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