WARN(ret, "failed to get mbus_fmt for output %s\n", sd->name);
ret = v4l2_subdev_call(sd, video, s_stream, 1);
WARN(ret, "starting stream failed for output %s\n", sd->name);
WARN(ret, "failed to get mbus_fmt for output %s\n", sd->name);
ret = v4l2_subdev_call(sd, video, s_stream, 1);
WARN(ret, "starting stream failed for output %s\n", sd->name);