CameraBin start-capture triggers auto-focus, making captured image blurry

[Dimitrios Katsaros]

Hello,

The camerabin in its self does not have support for autofocus, at least
none that I am aware of. Are you using v4l2src with wrappercamerabinsrc? If
that is the case I would suspect that the problem is renegotiation on
capture. When a new capture is performed, the pipeline is dynamically
changed to feed the image output path. That procs a renegotiaion. If the
caps on the video/image output are different than the viewfinder, a new
set_fmt is performed in v4l2, which resets the v4l2 controls and in turn
resets the focus. to verify/fix that you can do something like:

  g_object_set (camerabin_object,
    "viewfinder-caps", gst_caps_from_string(caps),
    "image-capture-caps", gst_caps_from_string(caps),
    "video-capture-caps", gst_caps_from_string(caps),
    NULL);


Make sure the caps string is the same for all 3.


Dimitrios

On Wed, Mar 16, 2016 at 5:07 PM, Robert Hailey <gstreamer at osndok.com> wrote:

>
> Greetings.
>
> I'm trying to understand what is causing an auto-focus event in
> response to the CameraBin receiving a 'start-capture' (or
> 'capture-start') signal.
>
> Fedora 22
> gstreamer1-1.4.5-1.fc22.x86_64
> Ziggi HD Plus Document Camera
> kernel-4.3.6-201.fc22.x86_64
>
> Does anyone know off-hand:
>
> * if-or-where there is an intentional focus being done in gstreamer,
>
> * if-or-where there is any re-initialization needed during still image
>   capture (e.g. when handling different view-finder & capture output
>   pixel sizes), or
>
> * if this (or a similar) issue has been addressed between 1.4.x and
>   1.6.x ?
>
> Thanks in advance!
>
> --
> Robert Hailey
>
>
> More details/narrative from cheese-list:
> https://mail.gnome.org/archives/cheese-list/2016-March/msg00000.html
>
> _______________________________________________
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> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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