$ gst-launch-0.10 -e v4l2src ! video/x-raw-yuv, width=720, height=480, framerate=2997/100, format=UYVY ! ffmpegcolorspace ! x264enc speed-preset=ultrafast tune=zerolatency bitrate=5000 ! matroskamux ! filesink location=test.mkv GST_DEBUG=3
WARNING: erroneous pipeline: no property "GST_DEBUG" in element "filesink0"

$ gst-launch-0.10 -e v4l2src ! video/x-raw-yuv, GST_DEBUG=3, width=720, height=480, framerate=2997/100, 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

$ gst-launch-0.10 -e v4l2src GST_DEBUG=3 ! video/x-raw-yuv,  width=720, height=480, framerate=2997/100, format=UYVY ! ffmpegcolorspace ! x264enc speed-preset=ultrafast tune=zerolatency bitrate=5000 ! matroskamux ! filesink location=test.mkv
WARNING: erroneous pipeline: no property "GST_DEBUG" in element "v4l2src0"

$ gst-launch-0.10 GST_DEBUG=3 -e v4l2src ! video/x-raw-yuv,  width=720, height=480, framerate=2997/100, format=UYVY ! ffmpegcolorspace ! x264enc speed-preset=ultrafast tune=zerolatency bitrate=5000 ! matroskamux ! filesink location=test.mkv
ERROR: pipeline could not be constructed: Unrecoverable syntax error while parsing pipeline GST_DEBUG=3 v4l2src ! video/x-raw-yuv, width=720, height=480, framerate=2997/100, format=UYVY ! ffmpegcolorspace ! x264enc speed-preset=ultrafast tune=zerolatency bitrate=5000 ! matroskamux ! filesink location=test.mkv .