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Re: [Bino-list] Possible to use two v4l2 inputs?

From: Martin Lambers
Subject: Re: [Bino-list] Possible to use two v4l2 inputs?
Date: Fri, 6 Apr 2012 16:07:27 +0200

On Thu, 05 Apr 2012 15:24:59 -0600, Goetz Dapp wrote:
> On 04/05/2012 12:10 PM, Martin Lambers wrote:
> > Hi Goetz!
> >
> > On Thu, 05 Apr 2012 09:38:54 -0600, Goetz Dapp wrote:
> >> I was wondering if it is at all possible to add two input devices
> >> instead of one for 3D playback and designate them to one
> >> perspective, i.e. /dev/video0 = left and /dev/video1 = right, or
> >> something along those lines?
> > There was an arbitrary limitation for a single device. I just
> > removed this, and opening two devices for left/right now works, at
> > least with the X11 grabber pseudo device (I don't have any v4l2
> > devices).
> >
> > Can you test the latest version from the git repository?
> >
> > It should be possible to open the video devices from the command
> > line: $ bino --device-frame-size=800x600 /dev/video0 /dev/video1
> >
> > If this works for you, I'll change the GUI dialog to allow this,
> > too.
> >
> >> It would be awesome if it also were possible to manually adjust
> >> some of the v4l2 control ids for these devices.
> > Hm, we're going through FFmpeg to open v4l2 devices. What controls
> > would you like to adjust? Sorry, I don't know much about v4l2...
> >
> > Martin
> >
> Hi Martin,
> thanks for your quick reply! I'll compile Bino from git tonight and
> give it a shot.
> Regarding the v4l2 controls, I am not even sure if that is doable
> through ffmpeg. I am using a camera that has an autofocus
> (V4L2_CID_FOCUS_AUTO) and auto white balance feature
> (V4L2_CID_AUTO_WHITE_BALANCE), which sometimes messes up a video
> during recording. There are other controls, too, that might be
> interesting for my setup. I was thinking about presetting it, and
> then turn it off, hence my question about the controls.

FFmpeg does not seem to support these advanced controls, so I'm afraid
we cannot easily add support for them to Bino. Isn't there some V4L2
application that allows to tweak all these things while an application
uses the device?


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