/**
* @brief check if file starts with a PKT_MAP header
*/
-static int gxf_probe(AVProbeData *p) {
+static int gxf_probe(const AVProbeData *p) {
static const uint8_t startcode[] = {0, 0, 0, 0, 1, 0xbc}; // start with map packet
static const uint8_t endcode[] = {0, 0, 0, 0, 0xe1, 0xe2};
if (!memcmp(p->buf, startcode, sizeof(startcode)) &&