hi35169dv500平台使用http协议推拉流UVC摄像头，帧率问题

拉流端用了很多工具测试，结果都是一样的

修改VUI，参考

if (encode_type == ENCODE_TYPE_H265) {
        ot_venc_h265_vui h265_vui = {0};
        ret = ss_mpi_venc_get_h265_vui(venc_chn, &h265_vui);
        if (ret != TD_SUCCESS) {
            LOGE("ss_mpi_vi_disable_chn failed!\n");
        }

        h265_vui.vui_time_info.timing_info_present_flag = 1;
        h265_vui.vui_time_info.num_ticks_poc_diff_one_minus1 =1;
        h265_vui.vui_time_info.num_units_in_tick = 1;
        h265_vui.vui_time_info.time_scale = venc_frate;
        ret = ss_mpi_venc_set_h265_vui(venc_chn, &h265_vui);
        if (ret != TD_SUCCESS) {
            LOGE("ss_mpi_vi_disable_chn failed!\n");
        }
    } else {
        ot_venc_h264_vui h264_vui;
        ret = ss_mpi_venc_get_h264_vui(venc_chn, &h264_vui);
        if (ret != TD_SUCCESS) {
            LOGE("ss_mpi_vi_disable_chn failed!\n");
        }

        h264_vui.vui_time_info.timing_info_present_flag = 1;
        h264_vui.vui_time_info.fixed_frame_rate_flag =1;
        h264_vui.vui_time_info.num_units_in_tick = 1;
        h264_vui.vui_time_info.time_scale = venc_frate*2;
        ret = ss_mpi_venc_set_h264_vui(venc_chn, &h264_vui);
        if (ret != TD_SUCCESS) {
            LOGE("ss_mpi_vi_disable_chn failed!\n");
        }
    }

修改3516dv500上面的uvc配置