v4l2src does not support progressive interlacing

[Nicolas Dufresne]

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.
>
> Best
>
> Antoine
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