Opening the file
AVFormatContext *formatContext;
if (avformat_open_input(&formatContext, "path/to/file.ext", nullptr, nullptr) != 0)
exit(1); // Couldn't open file
/// Retrieve stream information
if (avformat_find_stream_info(formatContext, nullptr) < 0)
exit(2); // Couldn't find stream information
Find the first video stream
int videoStreamIdx = -1;
for (int i
