It allow one instance only

[seekfor]

static int rtp_decode_h264(RtpDecoder* rtp_decoder, uint8_t* buf, size_t size) {
static const uint32_t nalu_start_4bytecode = 0x01000000;
static uint8_t nalu_buf[CONFIG_MAX_NALU_SIZE];
static int offset = 0;

nalu_buf[] can't be "static".