[gst-devel] Getting random results trying to split and combine video

[Sean Truman]

All,

I am trying to split a 640x320 web camera into two streams and then
recombine the streams into one stream.

Here is what I have so far. (Please be aware I am running Fedora Core 12
with the latest gstreamer libraries compiled from source and everything is
running on the same machine). I wanted to do proof of concept from command
line before I code it.

Capure Webcamera and stream via MPEG2/TS to port 1234

gst-launch v4l2src ! video/x-raw-yuv,width=640,height=480 ! ffenc_mpeg2video
! mpegtsmux ! udpsink host=192.168.1.2 port=1234

Next I start the each zone that does the cropping from the original stream.

Zone 1:
gst-launch -v udpsrc port=1234 ! mpegtsdemux ! ffdec_mpeg2video ! videocrop
top=0 left=0 right=320 bottom=0 ! ffenc_mpeg2video ! mpegtsmux ! udpsink
host=192.168.1.2 port=20001

Zone 2:
 gst-launch -v udpsrc port=1234 ! mpegtsdemux ! ffdec_mpeg2video ! videocrop
top=0 left=320 right=0 bottom=0 ! ffenc_mpeg2video ! mpegtsmux ! udpsink
host=192.168.1.2 port=20002

Now when I try to use the following command to view each stream, sometimes
it works sometimes it doesn't

View Zone 1:
gst-launch udpsrc port=20001 ! mpegtsdemux ! ffdec_mpeg2video !
ffmpegcolorspace ! xvimagesink sync=false

View Zone 2:
gst-launch udpsrc port=20002 ! mpegtsdemux ! ffdec_mpeg2video !
ffmpegcolorspace ! xvimagesink sync=false


Here is how I am trying to combine the two streams and view them as one.

gst-launch -v udpsrc port=20001 ! mpegtsdemux ! ffdec_mpeg2video ! videobox
left=0 top=0 ! videomixer name=zone1 ! videomixer name=zone2 ! alpha !
ffmpegcolorspace ! xvimagesink sync=false udpsrc port=20002 ! mpegtsdemux !
ffdec_mpeg2video ! videobox left=-320 top=0 ! zone2.

Am I forgetting something? I have scanned the email archieve to see if
anyone has tried to do the same thing but have found nothing.

Sean
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