gst-launch-0.10  videotestsrc is-live=true pattern=18 ! queue leaky=2 max-size-buffers=5 !  videoscale add-borders=1 ! video/x-raw-yuv,width=1024,height=768,pixel-aspect-ratio=\(fraction\)1/1 ! queue !  videoscale ! video/x-raw-yuv,width=720,height=480,pixel-aspect-ratio=\(fraction\)10/11 ! queue !  videorate ! video/x-raw-yuv,framerate=\(fraction\)30000/1001 ! ffmpegcolorspace ! ffenc_dvvideo ! mux.   audiotestsrc ! ffmux_dv name=mux ! queue  ! filesink location=/tmp/tmpxR0Xeo/fifo.dv

gst-launch-0.10  videotestsrc is-live=true pattern=18
! queue leaky=2 max-size-buffers=5
!  videoscale add-borders=1
! video/x-raw-yuv,width=1024,height=768,pixel-aspect-ratio=\(fraction\)1/1
! queue
!  videoscale
! video/x-raw-yuv,width=720,height=480,pixel-aspect-ratio=\(fraction\)10/11
! queue
!  videorate
! video/x-raw-yuv,framerate=\(fraction\)30000/1001
! ffmpegcolorspace
! ffenc_dvvideo
! mux.   audiotestsrc
! ffmux_dv name=mux
! queue
! filesink location=/tmp/tmpxR0Xeo/fifo.dv

INFO: Reading from /tmp/tmpxR0Xeo/fifo.dv

Setting pipeline to PAUSED ...
INFO: Connecting to 0.0.0.0:2000
INFO: Connected.
Pipeline is live and does not need PREROLL ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
ERROR: from element /GstPipeline:pipeline0/ffmux_dv:mux: Could not configure supporting library.
Additional debug info:
gstffmpegmux.c(665): gst_ffmpegmux_collected (): /GstPipeline:pipeline0/ffmux_dv:mux:
Failed to write file header - check codec settings