V4L2_PIX_FMT_MJPEG
sc->sc_fmtgrp[sc->sc_fmtgrp_idx].pixelformat = V4L2_PIX_FMT_MJPEG;
{ V4L2_PIX_FMT_MJPEG, "Motion-JPEG", V4L2_FMT_FLAG_COMPRESSED },
pixfmt = V4L2_PIX_FMT_MJPEG;