Gstreamer One Liners

kind of.

Stereo video casting

Capture & send synchronized video streams

gst-launch-0.10 -v gstrtpbin name=rtpbin\
\ # Capture video0\
v4l2src device=/dev/video0 !\
'image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)30/1' !\
\ # Session 0: Create\
rtpjpegpay ! rtpbin.send_rtp_sink_0\
rtpbin.send_rtp_src_0 ! multiudpsink clients="127.0.0.1:9996"\
\ # Session 0: Send RTCP packets\
rtpbin.send_rtcp_src_0 ! multiudpsink clients="127.0.0.1:9997" sync=false async=false\
\ # Session 0: Receive RTCP packets\
udpsrc port=10000 ! rtpbin.recv_rtcp_sink_0\
\ # Capture video1\
v4l2src device=/dev/video1 !\
'image/jpeg, width=(int)640, height=(int)480, framerate=(fraction)30/1' !\
\ # Session 1: Create\
rtpjpegpay ! rtpbin.send_rtp_sink_1\
rtpbin.send_rtp_src_1 ! multiudpsink clients="127.0.0.1:9998"\
\ # Session 1: Receive RTCP packets\
rtpbin.send_rtcp_src_1 ! multiudpsink clients="127.0.0.1:9999" sync=false async=false\
\ # Session 1: Send RTCP packets\
udpsrc port=10001 ! rtpbin.recv_rtcp_sink_1

Receive & dump synchronized video streams

gst-launch-0.10 -v gstrtpbin name=rtpbin\
\ # Session 0: join \
udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)JPEG, ssrc=(guint)469657143, payload=(int)96, clock-base=(guint)2841649723, seqnum-base=(guint)39869" port=9996 !\
rtpbin.recv_rtp_sink_0 \
rtpbin. ! rtpjpegdepay !\
\ # Session 0: Dump video\
filesink location=session0.mjpeg\
\ # Session 0: Receive RTCP packets\
udpsrc port=9997 ! rtpbin.recv_rtcp_sink_0\
\ # Session 0: Send RTCP packets\
rtpbin.send_rtcp_src_0 ! multiudpsink clients="127.0.0.1:10000" sync=false async=false\
\ # Session 1: join\
udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)JPEG, ssrc=(guint)469657143, payload=(int)96, clock-base=(guint)2841649723, seqnum-base=(guint)39869" port=9998 !\
rtpbin.recv_rtp_sink_1 \
rtpbin. ! rtpjpegdepay !\
\ # Session 1: Dump video\
filesink location=session1.mjpeg\
\ # Session 1: Receive RTCP packets\
udpsrc port=9999 ! rtpbin.recv_rtcp_sink_1\
\ # Session 1: Send RTCP packets\
rtpbin.send_rtcp_src_1 ! multiudpsink clients="127.0.0.1:10001" sync=false async=false

Receive & play synchronized video streams

gst-launch-0.10 -v gstrtpbin name=rtpbin\
\ # Session 0: Join\
udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)JPEG, ssrc=(guint)469657143, payload=(int)96, clock-base=(guint)2841649723, seqnum-base=(guint)39869" port=9996 !\
rtpbin.recv_rtp_sink_0 \
rtpbin. ! rtpjpegdepay !\
\ # Session 1: Decode video & adjust framerate\
jpegdec ! videorate ! video/x-raw-yuv,framerate=15/1 !\
\ # Session 0: Play video\
xvimagesink\
\ # Session 0: Receive RTCP packets\
udpsrc port=9997 ! rtpbin.recv_rtcp_sink_0\
\ # Session 0: Send RTCP packets\
rtpbin.send_rtcp_src_0 ! multiudpsink clients="127.0.0.1:10000" sync=false async=false \

gst-launch-0.10 -v gstrtpbin name=rtpbin\
\ # Session 1: Join\
udpsrc caps="application/x-rtp, media=(string)video, clock-rate=(int)90000, encoding-name=(string)JPEG, ssrc=(guint)469657143, payload=(int)96, clock-base=(guint)2841649723, seqnum-base=(guint)39869" port=9998 !\
rtpbin.recv_rtp_sink_1\
rtpbin. ! rtpjpegdepay !\
\ # Session 1: Decode video & adjust framerate\
jpegdec ! videorate ! video/x-raw-yuv,framerate=15/1 !\
\ # Session 1: Play video\
xvimagesink\
\ # Session 1: Receive RTCP packets\
udpsrc port=9999 ! rtpbin.recv_rtcp_sink_1\
\ # Session 1: Send RTCP packets\
rtpbin.send_rtcp_src_1 ! multiudpsink clients="127.0.0.1:10001" sync=false async=false

Play dumped videos

gst-launch-0.10 -v\
\ # Open session0.mjpeg\
filesrc location=session0.mjpeg !\
\ # Decode video & adjust framerate\
jpegdec ! videorate ! video/x-raw-yuv,framerate=15/1 !\
\ # Play video\
xvimagesink\
\ # Open session1.mjpeg\
filesrc location=session1.mjpeg !\
\ # Decode video & adjust framerate\
jpegdec ! videorate ! video/x-raw-yuv,framerate=15/1 !\
\ # Play video\
xvimagesink

Greenbox

Realtime alpha blending with colorkey

gst-launch-0.10 -v\
\ # V4l2: Open\
v4l2src device=/dev/video0 ! 'video/x-raw-yuv, format=(fourcc)YUY2, width=(int)640, height=(int)480, framerate=(fraction)15/2' !\
\ # v4l2: Apply alpha\
ffmpegcolorspace ! alpha method=custom target-r=0 target-g=255 target-b=0 angle=40 !\
\ # v4l2: mix\
videomixer name=mix !\
\ # Mixer: display\
ffmpegcolorspace ! xvimagesink\
\ # Background: open\
filesrc location=bg.avi ! decodebin !\
\ # Background: mix\
ffmpegcolorspace ! mix.

Creates pretty nice results even with crappy equipment. i used green paper a webcam and usual table lamp. video

Control multiple channels

Decode the src and tee it. deinterleave both stream copies and edit (equalizer & volume) every channel independently. write to 2 different alsa devices.

gst-launch-0.10 -v filesrc name=src ! decodebin ! tee name=t1\
t1. !  queue ! deinterleave name=deint1\
interleave name=int1 ! alsasink device=hw:1\
deint1.src1 ! queue ! equalizer-3bands name=eq11 ! volume name=v11 ! int1.sink1\
deint1.src0 ! queue ! equalizer-3bands name=eq10 ! volume name=v10 ! int1.sink2\
t1. ! queue ! deinterleave name=deint0\
interleave name=int0 ! alsasink device=hw:0\
deint0.src1 ! queue !  equalizer-3bands name=eq01 ! volume name=v01 ! int0.sink1\
deint0.src0 ! queue !  equalizer-3bands name=eq00 ! volume name=v00 ! int0.sink2