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

[Götz Dapp]

Hi Martin,

On 04/07/2012 04:58 AM, Martin Lambers wrote:
> 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,
> Martin
just tested it, it works just fine! Thanks so much!

I actually noticed something interesting: on a fresh booted computer the 
two streams are actually pretty much synchronous, while if I stop it and 
try it several times they are quite noticeably apart. This was to be 
expected, but I guess what I am saying is how surprised I am that it 
runs synchronous on a fresh boot.

This is pretty cool stuff.

Just out of curiosity: is there any way to record the bino output stream?

Thanks again and happy Easter!
Goetz