码流取走不及时，导致venc繁忙

我在使用3519来获得uvc镜头图像并出流时遇见问题，将镜头数据发送给vpss，然后从vpss中取出数据，处理后发送给venc，venc收到了数据，打开h264e的日志发现

————————————————————module param——————————————————————————————————
one_pack h264_vb_src power_save_en mini_buf_mode qp_hist_en
0 private 1 0 0

————————————————————chn attr————————————————————————————————————
id max_width max_height width height profile color_to_grey buf_size by_frame gop_mode max_stream_cnt
0 256 192 256 192 base n 36864 y normal_p 200

————————————————————picture info——————————————————————————————————
id enc_start enc_succeed lost discard p_skip recode release_stream unread_stream
0 104 104 0 0 0 0 0 104

————————————————————stream buffer—————————————————————————————————-
id base read_tail read_head write_tail write_head data_len buf_free
0 0xffffffc0132c0000 0x0 0x8c40 0x8c40 0x8c40 0 896

————————————————————ref_param info—————————————————————————————————
id pred_en base enhance used_frame max_used_frame rcn_ref_share_buf_en frame_buf_ratio force_i_blk_cnt
0 y 1 0 2 2 y 70 0

————————————————————roi_bg info——————————————————————————————————-
id bg_src_frame_rate bg_dst_frame_rate
0 -1 -1

————————————————————syntax info1——————————————————————————————————
id slice_split_en split_mode slice_size slice_output_en intra_refresh_en refresh_mode refresh_num qp_idr
0 n n/a n/a n/a n n/a n/a n/a

————————————————————syntax info2——————————————————————————————————
id profile entrpy_i entrpy_p entrpy_b trans_i trans_p scaling_list_valid poc dblk_idc alpha beta
0 base cavlc cavlc cavlc 4x4 4x4 n 0 0 0 0

————————————————————pu info————————————————————————————————————-
id constrained_intra search_window hor ver
0 0 auto 0 0

但是venc获取数据的线程超时 get venc stream time out, exit thread，这里用的时venc例程中获取数据的线程，图像是256x192的，venc的基本设置入下：
static td_s32 start_venc(const ot_sample_svp_switch switch_ptr,
sample_vo_cfg vo_cfg)
{
td_s32 ret = TD_SUCCESS;
ot_venc_chn h264_chn = 0;
sample_comm_venc_chn_param chn_param;
// ot_size ven_size = {1280, 720};
//ot_size ven_size = {640, 480};
ot_size ven_size = {256, 192};
chn_param.frame_rate = 50; / 30 is a number /
chn_param.stats_time = 2; / 2 is a number /
chn_param.gop = 30; / 60 is a number /
chn_param.venc_size = ven_size;
// chn_param.size = PIC_720P;
chn_param.size = PIC_256X192;
//chn_param.size = PIC_640X480;
chn_param.profile = 0;
chn_param.is_rcn_ref_share_buf = TD_TRUE;

chn_param.type = OT_PT_H264;
chn_param.rc_mode = SAMPLE_RC_CBR;

if (switch_ptr->is_venc_open  == TD_TRUE) {
    ret = sample_comm_venc_get_gop_attr(OT_VENC_GOP_MODE_NORMAL_P, &chn_param.gop_attr);
    sample_svp_check_exps_goto(ret != TD_SUCCESS, end_0, SAMPLE_SVP_ERR_LEVEL_ERROR,
        "Error(%#x),sample_comm_venc_get_gop_attr failed!\n", ret);

    ret = sample_comm_venc_start(h264_chn, &chn_param);
    sample_svp_check_exps_goto(ret != TD_SUCCESS, end_0, SAMPLE_SVP_ERR_LEVEL_ERROR,
        "Error(%#x),sample_comm_venc_start failed!\n", ret);

    ret = sample_comm_venc_start_get_stream(&h264_chn, 0);
    sample_svp_check_exps_goto(ret != TD_SUCCESS, end_1, SAMPLE_SVP_ERR_LEVEL_ERROR,
        "Error(%#x),sample_comm_venc_start_get_stream failed!\n", ret);


   // printf("venc chn param.size.width is %d height is %d",chn_param.size.width,chn_param.size.height);
} 

新手使用3519 救救孩子吧