v4l2src does not support progressive interlacing

[Nicolas Dufresne]

I forgot, to capture the logs, append 2> GST.log and send me the file. Put
my email in CC as the mailing list will strip the attachment.

Le ven. 19 oct. 2018 22 h 03, Nicolas Dufresne <nicolas at ndufresne.ca> a
écrit :

>
>
> Le ven. 19 oct. 2018 19 h 12, Tim Harvey <tharvey at gateworks.com> a écrit :
>
>> 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
>>
>
> V4l2 field 6 is V4L2_FIELD_SEQ_BT, which we never supported in GStreamer
> V4L2. Though we used to let it stream. The following trace was misleading,
> since the device does not really wants interleaved and you didn't request
> progressive. Can you attach a trace when ran with environment
> GST_DEBUG="v4l2*:7". That will give me more data to verify. I'll try and
> improve the error, though I might not have enough time to enable
> interlace-mode=field, as it's a bit complicated the way it's defined in
> GStreamer (requires two video meta !). There is pending patches for
> interlace-mode=alternate which is equally complex.
>
> 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
>>
>
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