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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: Sat, 7 Apr 2012 12:58:08 +0200

Hi Goetz!

On Fri, 06 Apr 2012 14:23:58 -0600, Götz Dapp wrote:
> >>>>> 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.
> >>
> >> thanks, that's what I suspected. I compiled bino last night and the
> >> two input work! The resolution is limited to 800x600, I suspect
> >> that's because of bandwidth issues. Do you know if ffmpeg supports
> >> controlling the input data type / chroma, i.e. MJPG, which the
> >> camera can run natively? When I use cvlc and set the v4l2-chroma
> >> to MJPG it supports two cameras as 1280x800.
> > This seems to be supported by FFmpeg, but I'm not sure how to use
> > it. Can you add the following to line 815 in src/media_object.cpp?
> > 'av_dict_set(&iparams, "input_format", "mjpeg", 0);'
> > (Or apply the attached patch.)
> >
> > Does this work?
> >
> > If so, I can add a command line and GUI option "request mjpeg
> > format" or similar.
> >
> Works like a charm! Sweet! Thanks so much!

The latest version now has an option --device-format to request MJPEG
format, and the GUI "Open device" dialog was improved to allow opening
two devices and requesting MJPEG format.

Can you test this?

Best regards,

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