ffmpeg main函数

来源：互联网发布：mac桌面文件放哪里编辑：程序博客网时间：2024/06/05 03:52

int main(int argc, char **argv){    int64_t ti;    av_log_set_flags(AV_LOG_SKIP_REPEATED);    parse_loglevel(argc, argv, options);    avcodec_register_all();#if CONFIG_AVDEVICE    avdevice_register_all();#endif#if CONFIG_AVFILTER    avfilter_register_all();#endif    av_register_all();    avformat_network_init();    avio_set_interrupt_cb(decode_interrupt_cb);    init_opts();    show_banner();    av_log(NULL, AV_LOG_WARNING, "*** THIS PROGRAM IS DEPRECATED ***\n"                                 "This program is only provided for compatibility "                                 "and will be removed in a future release. Please "                                 "use avconv instead.\n");    /* parse options */    parse_options(NULL, argc, argv, options, opt_output_file);    if(nb_output_files <= 0 && nb_input_files == 0) {        show_usage();        fprintf(stderr, "Use -h to get full help or, even better, run 'man ffmpeg'\n");        exit_program(1);    }    /* file converter / grab */    if (nb_output_files <= 0) {        fprintf(stderr, "At least one output file must be specified\n");        exit_program(1);    }    if (nb_input_files == 0) {        fprintf(stderr, "At least one input file must be specified\n");        exit_program(1);    }    ti = getutime();    if (transcode(output_files, nb_output_files, input_files, nb_input_files,                  stream_maps, nb_stream_maps) < 0)        exit_program(1);    ti = getutime() - ti;    if (do_benchmark) {        int maxrss = getmaxrss() / 1024;        printf("bench: utime=%0.3fs maxrss=%ikB\n", ti / 1000000.0, maxrss);    }    exit_program(0);    return 0;}

接下来就开始逐行阅读，随着代码阅读的过程，会逐渐的完善注释

0 0