client

// Make with:
// g++ -std=c++0x tutorial.cpp $(pkg-config --libs --cflags libavformat) -lstdc++ -o test

#include <stdio.h>

extern "C" {
  #include <libavcodec/avcodec.h>
  #include <libavformat/avformat.h>
  #include <libavutil/avutil.h>
}
#include <mutex>

int main(int argc, char *argv[]) {
  // initialize av decoders
  static std::once_flag initFlag;
  std::call_once(initFlag, []() { av_register_all(); });

  // shared_ptr make it exception-safe
  std::shared_ptr<AVFormatContext> avFormat(avformat_alloc_context(),
            &avformat_free_context);

  // open and parse header information
  auto avFormatPtr = avFormat.get();
  avformat_network_init();
  if (avformat_open_input( &avFormatPtr, "rtp://localhost:5000",
              nullptr, nullptr) != 0)
    throw std::runtime_error("Error while calling avformat_open_input (probably invalid file format)" );


  fprintf(stderr, "past\n");

  if (avformat_find_stream_info(avFormat.get(), nullptr) < 0)
    throw std::runtime_error("Error while calling avformat_find_stream_info");

  fprintf(stderr, "past\n");

  return 0;
}