output_codec_ctx->bit_rate = 400000;
    output_codec_ctx->width = 1920;
    output_codec_ctx->height = 1200;
    output_codec_ctx->time_base.num = 1;
    output_codec_ctx->time_base.den = 12;
    output_codec_ctx->gop_size = 8;
    output_codec_ctx->max_b_frames = 1;
    output_codec_ctx->pix_fmt = AV_PIX_FMT_YUV420P;