void RenderEnginePixo::video_init_params(x264_param_t* params) {
    ZeroMemory(&x264_params, sizeof(x264_params));
    if(x264_param_default_preset(params, "veryfast", "zerolatency")) {
        x264Error::throw_("x264_param_default_preset() failed");
    }
    const char* parms[] = {
        "vbv-maxrate", "500",
        "vbv-bufsize", "1666",
        "intra-refresh", NULL,
        //"fps", "30",
        "slice-max-size", "1500",
        "bitrate", "500",
        0,0
    };
    const char** p = parms;
    while(p[0]) {
        if(x264_param_parse(params, p[0], p[1])) {
            x264Error::throw_("x264_param_parse(\"%s\", \"%s\") failed", p[0], p[1]);
        }
        p += 2;
    }
}

...

    if(!x264_encoder) {
        first_frame = true;
        video_init_params(&x264_params);
        x264_params.i_width = (buffer->BufferWidth+1)&~1;
        x264_params.i_height = (buffer->BufferHeight+1)&~1;
        x264_params.i_timebase_num = 1000;
        x264_params.i_timebase_den = 15000;

...

    if(first_frame) {
        video_encode_starttime = systemTimeProvider.getCurrentTime();
        x264_picture.i_pts = 0;
    } else {
        //unsigned long millis = systemTimeProvider.getCurrentTime() - video_encode_starttime;
        //x264_picture.i_pts += millis;
        //x264_picture.i_pts += 10;
        x264_picture.i_pts += 1;
    }
    x264_picture.i_type = X264_TYPE_AUTO;
    x264_picture.i_qpplus1 = 0;

    x264_nal_t* nals;
    int num_nals;
    x264_picture_t pic_out;
    int n = x264_encoder_encode(x264_encoder, &nals, &num_nals, &x264_picture, &pic_out);
    //LOG("encoded: %d %d", n, num_nals);
    if(n<0) {
        x264Error::throw_("x264_encoder_encode() failed");
    }
    write_nals(nals, num_nals, x264_file);