$ gst-launch-0.10 -e v4l2src ! video/x-raw-yuv,  width=720, height=487, framerate=30000/1001, interlaced=true, format=UYVY ! ffmpegcolorspace ! x264enc speed-preset=ultrafast tune=zerolatency bitrate=5000 ! matroskamux ! filesink location=test.mkv
WARNING: erroneous pipeline: could not link v4l2src0 to ffmpegcsp0