Implement parsing of vbv buffering info in RTSP.

        br.skipBits(2);  // chroma_format

        br.skipBits(1);  // low_delay

        if (br.getBits(1)) {  // vbv_parameters

            TRESPASS();

            br.skipBits(15);  // first_half_bit_rate

            CHECK(br.getBits(1));  // marker_bit

            br.skipBits(15);  // latter_half_bit_rate

            CHECK(br.getBits(1));  // marker_bit

            br.skipBits(15);  // first_half_vbv_buffer_size

            CHECK(br.getBits(1));  // marker_bit

            br.skipBits(3);  // latter_half_vbv_buffer_size

            br.skipBits(11);  // first_half_vbv_occupancy

            CHECK(br.getBits(1));  // marker_bit

            br.skipBits(15);  // latter_half_vbv_occupancy

            CHECK(br.getBits(1));  // marker_bit

        }

    }

    unsigned video_object_layer_shape = br.getBits(2);