ffmpeg.c

    for(i=0; i<CODEC_TYPE_NB; i++){
        avcodec_opts[i]= avcodec_alloc_context2(i);
    }
    avformat_opts = avformat_alloc_context();
    sws_opts = sws_getContext(16,16,0, 16,16,0, sws_flags, NULL,NULL,NULL);

    show_banner();

    /* parse options */
    parse_options(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");
        av_exit(1);
    }

    /* file converter / grab */
    if (nb_output_files <= 0) {
        fprintf(stderr, "At least one output file must be specified\n");
        av_exit(1);
    }

    if (nb_input_files == 0) {
        fprintf(stderr, "At least one input file must be specified\n");
        av_exit(1);
    }

    ti = getutime();
    if (av_encode(output_files, nb_output_files, input_files, nb_input_files,
                  stream_maps, nb_stream_maps) < 0)
        av_exit(1);
    ti = getutime() - ti;
    if (do_benchmark) {
        printf("bench: utime=%0.3fs\n", ti / 1000000.0);
    }

    return av_exit(0);
}