About combine v4l2 streams into one

[Tim Wood]

Hi

Perhaps try a couple things:
- run with --gst-debug-level=4 
(which may give more info).

I know when I ran 2 USB video cams with v4l2 source, there was a bandwidth problem trying to view them both at the same time. In that case I had to do a couple things:
--- set up 'quirks' for my video driver
#rmmod ucvvideo 
#modprobe ucvideo quirks=128

And even with that it, I have to set one of the cameras to 320x240 - otherwise it just halts.

Try the gst-debug-level setting above.  The output is verbose, but hopefully something in the output that will make it obvious

Cheers
Tim
>     Hi everybody!
>     I'm trying to combine two v4l2 streams into one with the latest
> gstreamer-1.4.3. First of all, I want to test the videomixer function with
> gst-launch-1.0 use the follow command:
>     gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw ! videobox
> left=0 border-alpha=0 ! alpha ! queue ! videomixer name=mix ! videoconvert !
> xvimagesink sync=false \
> v4l2src device=/dev/video1 ! video/x-raw ! alpha ! videobox left=-704
> border-alpha=0 ! queue ! mix.
> 
>      Unfortunately it not worked and appeared the follow error:
>      Setting pipeline to PAUSED ...
>      Pipeline is live and does not need PREROLL ...
>      Setting pipeline to PLAYING ...
>      New clock: GstSystemClock
>      ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> Internal data flow error.
>      Additional debug info:
>      gstbasesrc.c(2933): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
>      streaming task paused, reason not-negotiated (-4)
>      Execution ended after 0:00:00.000593582
>      Setting pipeline to PAUSED ...
>      Setting pipeline to READY ...
>      Setting pipeline to NULL ...
>      Freeing pipeline ...
> 
>      But if I test this function with gst-launch-0.10 as the follow
> commands:
>      gst-launch-0.10 v4l2src device=/dev/video0 ! video/x-raw-yuv !
> videobox left=0 border-alpha=0 ! alpha ! queue ! videomixer name=mix !
> ffmpegcolorspace ! xvimagesink sync=false v4l2src device=/dev/video1 !
> video/x-raw-yuv ! alpha ! videobox left=-704 border-alpha=0 ! queue ! mix.
> 
>      Miraculously, the video wall works well!
> 
>      So I guess maybe I should setup some parameters when use
> gst-launch-1.0 but I was not do it, so appeared the error. 
>       I need everyone's help! Tell me how to use gst-launch-1.0 to combine
> v4l2 streams into one! 
>       Thanks very much!
> 
> 
> 
> 
> 
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/About-combine-v4l2-streams-into-one-tp4669778.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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Tim Wood – Head of Game Development
Visionary iGaming
T: +61 413 845 417
M: +61 413 845 317
Skype: tjwo1976
tim at visionaryigaming.com  
www.visionaryigaming.com

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