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