Streaming Magic

streaming.md

Streaming Magic

This gist contains cmd line streaming magic.

Create a virtual cam with the desktop as the input

For a 1280x1024 desktop:

sudo modprobe v4l2loopback devices=1

gst-launch-0.10 -v ximagesrc startx=0 starty=0 endx=1279 endy=1023 ! videoscale \
  ! ffmpegcolorspace ! "video/x-raw-yuv,width=1280,height=1024,framerate=10/1" \
  ! v4l2sink device=/dev/video1

# not working if encode to video4linux2 is missing
# avconv -f x11grab -r 15 -s 1280x720 -i :0.0+0,0 -vcodec rawvideo \
#   -pix_fmt yuv420p -threads 0 -f video4linux2 /dev/video1
# "Requested output format 'video4linux2' is not a suitable output format"

Other Inputs

static image, etc.: https://github.com/umlaeute/v4l2loopback/wiki

Conference Systems

Call a conference room via cmd line and send your audio + video

simpleopal h323:<Number>@<IP> --rx-video --tx-video \
  --grabber "Integrated Camera" -s "Default"

using --grabber "#<Number>" indexed 1+ should work, too for video input.

to do: test to send a second stream with the desktop to share presentations, etc. Might be as simple as:

simpleopal h323:<Number>@<IP> --tx-video --grabber "#2" -S