问题:AVFormatContext :: nb_streams的价值太高了。 我的C ++代码(错误处理,包括等等以减少列表):
void printA(AVFormatContext* _a)
{
std::cout << "duration " << (unsigned long)_a->duration << "\n";
std::cout << "streams " << _a->nb_streams << "\n";
std::cout << "format name " << _a->iformat->name << "\n";
std::cout << "bit_rate " << _a->bit_rate << "\n";
std::cout << "long name " << _a->iformat->long_name << "\n";
}
int main(int argc, char **argv)
{
if ( argc < 2 )
{
std::cout << "Usage: " << argv[0] << " <file>\n";
return 1;
}
av_register_all();
AVFormatContext *pFormatCtx = avformat_alloc_context();
avformat_open_input (&pFormatCtx, argv[1], NULL, NULL);
avformat_find_stream_info(pFormatCtx, NULL);
printA( pFormatCtx );
return 0;
}
运行:
xx@xx /tmp/avlib $ ./avlibtest /ar/video/Nauka.Sna.2006.HDRip.AVC.mkv
[matroska,webm @ 0x804c040] max_analyze_duration reached
[matroska,webm @ 0x804c040] Estimating duration from bitrate, this may be inaccurate
duration 134741408
streams 134531840 <---- !!! :-O
format name matroska,webm
bit_rate 0
long name Matroska/WebM file format
但“avplay”计划运作良好。