[gst-devel] v4l2loopback and gstreamer

[Stefan Kost]

Am 28.01.2011 16:16, schrieb giorgino:
> 
> Hi All I need your support in order to solve an issue. I had a usb camera
> that has to be used at the same time by two different application. This it
> is obviously a problem because when I launch the second application, system
> says me that the resource is busy. I thought that the solution can be to
> install v4l2loopback and execute it. In this way I have two devices that are
> /dev/video0 and /dev/video1. So I launched
> 
> gst-launch v4l2src device=/dev/video0 ! autovideosink
> 
> and after
>   
> gst-launch v4l2src device=/dev/video1 ! autovideosink
> 
> The first pipe works well but the second one goes on error with the
> following message
> 
> Impostazione della pipeline a PAUSED ...
> libv4l2: error getting pixformat: Argomento non valido
> ERRORE: la pipeline non vuole mettersi in pausa.
> ERRORE: dall'elemento /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Could not
> negotiate format
> Informazioni di debug aggiuntive:
> gstbasesrc.c(2755): gst_base_src_start ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> Check your filtered caps, if any
> Impostazione della pipeline a NULL ...
> Esecuzione di free sulla pipeline...
> 
> 
> How I can solve this issue?
> 

Please file a bug and attatch:
- information of how to setup the v4l2loopback device
- a (compressed) log for the 2nd GST_DEBUG="':5" gst-launch 2>debug.log v4l2src
device=/dev/video1 ! autovideosink

Stefan