v4l2src does not support progressive interlacing

[avilleret]

Hi Nicolas, 

I do have the same issue with a BlueCherry capture card (BT878 - Provideo
PV150) and gsttreamer 1.14.1 on Ubuntu 18.04.

here is the pipeline :

GST_DEBUG_NO_COLOR=1 GST_DEBUG="v4l2*:7" gst-launch-1.0 v4l2src
name=video_source device=/dev/video0 !
video/x-raw,format=YUY2,width=768,height=512,framerate=25/1  ! videoconvert  
! autovideosink 2> gst.log

and the result is here :
https://gist.github.com/avilleret/db588687ce5121efc4125a5989a128c9

note the error on line 408 : 
ERREUR : de l’élément /GstPipeline:pipeline0/GstV4l2Src:video_source :
Device '/dev/video0' does not support progressive interlacing

I'll try to build gstreamer with your patch and let you know.

Best regards

Antoine



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