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Grayscale video in DM365

Other Parts Discussed in Thread: TMS320DM365

Hello everyone!
I am using:
1) TMS320DM365 evoluation module EVMDM365 from Digital Spectrum (support.spectrumdigital.com/.../) with DVSDK 4.02
2) Analog grayscale videocamera 576i (625/50).
My GStreamer pipeline is
gst-launch -v v4l2src always-copy=FALSE input-src=COMPOSITE ! 'video/x-raw-yuv,format=(fourcc)NV12,width=736,height=576' ! TIVidenc1 codecName=h264enc engineName=codecServer contiguousInputFrame=TRUE ! filesink location=test.mp4
I get a color video with ugly colors.
How can I get a grayscale video?
Thank you in advance.
Sorry for my english.
Dmitry Ioffe