13 #include <libavformat/avformat.h>
16 #include <QApplication>
18 #include "mainwindow.h"
19 #include "ffmpeg_raii.h"
21 #define MAX_STREAMS 16
24 using namespace std::chrono;
26 string filename_for_frame(unsigned stream_idx, int64_t pts)
29 snprintf(filename, sizeof(filename), "frames/cam%d-pts%09ld.jpeg", stream_idx, pts);
34 vector<int64_t> frames[MAX_STREAMS];
38 int main(int argc, char **argv)
41 avformat_network_init();
43 QApplication app(argc, argv);
44 MainWindow mainWindow;
47 thread(thread_func).detach();
54 auto format_ctx = avformat_open_input_unique("example.mp4", nullptr, nullptr);
55 if (format_ctx == nullptr) {
56 fprintf(stderr, "%s: Error opening file\n", "example.mp4");
62 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
63 &pkt, av_packet_unref);
67 if (av_read_frame(format_ctx.get(), &pkt) != 0) {
70 fprintf(stderr, "Got a frame from camera %d, pts = %ld, size = %d\n",
71 pkt.stream_index, pkt.pts, pkt.size);
72 string filename = filename_for_frame(pkt.stream_index, pkt.pts);
73 FILE *fp = fopen(filename.c_str(), "wb");
75 perror(filename.c_str());
78 fwrite(pkt.data, pkt.size, 1, fp);
81 assert(pkt.stream_index < MAX_STREAMS);
82 frames[pkt.stream_index].push_back(pkt.pts);
84 this_thread::sleep_for(milliseconds(1000) / 120);