void open_output_stream();
static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
void open_output_stream();
static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);