ffmpeg_opt.c

                    if(ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) ost->avfilter = av_strdup("anull");
                    if(ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) ost->avfilter = av_strdup("null");
                    ist->discard = 0;
                    ist->st->discard = ist->user_set_discard;
                    break;
                }
            }
            if(!ost->sync_ist){
                av_log(NULL, AV_LOG_FATAL, "Missing %s stream which is required by this ffm\n", av_get_media_type_string(ost->st->codec->codec_type));
                exit_program(1);
            }
        }
    } else if (!o->nb_stream_maps) {
        char *subtitle_codec_name = NULL;
        /* pick the "best" stream of each type */

        /* video: highest resolution */
        if (!o->video_disable && av_guess_codec(oc->oformat, NULL, filename, NULL, AVMEDIA_TYPE_VIDEO) != AV_CODEC_ID_NONE) {
            int area = 0, idx = -1;
            int qcr = avformat_query_codec(oc->oformat, oc->oformat->video_codec, 0);
            for (i = 0; i < nb_input_streams; i++) {
                int new_area;
                ist = input_streams[i];
                new_area = ist->st->codec->width * ist->st->codec->height + 100000000*!!ist->st->codec_info_nb_frames;
                if((qcr!=MKTAG('A', 'P', 'I', 'C')) && (ist->st->disposition & AV_DISPOSITION_ATTACHED_PIC))
                    new_area = 1;
                if (ist->st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
                    new_area > area) {
                    if((qcr==MKTAG('A', 'P', 'I', 'C')) && !(ist->st->disposition & AV_DISPOSITION_ATTACHED_PIC))
                        continue;
                    area = new_area;
                    idx = i;
                }
            }
            if (idx >= 0)
                new_video_stream(o, oc, idx);
        }

        /* audio: most channels */
        if (!o->audio_disable && av_guess_codec(oc->oformat, NULL, filename, NULL, AVMEDIA_TYPE_AUDIO) != AV_CODEC_ID_NONE) {
            int best_score = 0, idx = -1;
            for (i = 0; i < nb_input_streams; i++) {
                int score;
                ist = input_streams[i];
                score = ist->st->codec->channels + 100000000*!!ist->st->codec_info_nb_frames;
                if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
                    score > best_score) {
                    best_score = score;
                    idx = i;
                }
            }
            if (idx >= 0)
                new_audio_stream(o, oc, idx);
        }

        /* subtitles: pick first */
        MATCH_PER_TYPE_OPT(codec_names, str, subtitle_codec_name, oc, "s");
        if (!o->subtitle_disable && (avcodec_find_encoder(oc->oformat->subtitle_codec) || subtitle_codec_name)) {
            for (i = 0; i < nb_input_streams; i++)
                if (input_streams[i]->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
                    AVCodecDescriptor const *input_descriptor =
                        avcodec_descriptor_get(input_streams[i]->st->codec->codec_id);
                    AVCodecDescriptor const *output_descriptor = NULL;
                    AVCodec const *output_codec =
                        avcodec_find_encoder(oc->oformat->subtitle_codec);
                    int input_props = 0, output_props = 0;
                    if (output_codec)
                        output_descriptor = avcodec_descriptor_get(output_codec->id);
                    if (input_descriptor)
                        input_props = input_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
                    if (output_descriptor)
                        output_props = output_descriptor->props & (AV_CODEC_PROP_TEXT_SUB | AV_CODEC_PROP_BITMAP_SUB);
                    if (subtitle_codec_name ||
                        input_props & output_props ||
                        // Map dvb teletext which has neither property to any output subtitle encoder
                        input_descriptor && output_descriptor &&
                        (!input_descriptor->props ||
                         !output_descriptor->props)) {
                        new_subtitle_stream(o, oc, i);
                        break;
                    }
                }
        }
        /* Data only if codec id match */
        if (!o->data_disable ) {
            enum AVCodecID codec_id = av_guess_codec(oc->oformat, NULL, filename, NULL, AVMEDIA_TYPE_DATA);
            for (i = 0; codec_id != AV_CODEC_ID_NONE && i < nb_input_streams; i++) {
                if (input_streams[i]->st->codec->codec_type == AVMEDIA_TYPE_DATA
                    && input_streams[i]->st->codec->codec_id == codec_id )
                    new_data_stream(o, oc, i);
            }
        }
    } else {
        for (i = 0; i < o->nb_stream_maps; i++) {
            StreamMap *map = &o->stream_maps[i];

            if (map->disabled)
                continue;

            if (map->linklabel) {
                FilterGraph *fg;
                OutputFilter *ofilter = NULL;
                int j, k;

                for (j = 0; j < nb_filtergraphs; j++) {
                    fg = filtergraphs[j];
                    for (k = 0; k < fg->nb_outputs; k++) {
                        AVFilterInOut *out = fg->outputs[k]->out_tmp;
                        if (out && !strcmp(out->name, map->linklabel)) {
                            ofilter = fg->outputs[k];
                            goto loop_end;
                        }
                    }
                }
loop_end:
                if (!ofilter) {
                    av_log(NULL, AV_LOG_FATAL, "Output with label '%s' does not exist "
                           "in any defined filter graph, or was already used elsewhere.\n", map->linklabel);
                    exit_program(1);
                }
                init_output_filter(ofilter, o, oc);
            } else {
                int src_idx = input_files[map->file_index]->ist_index + map->stream_index;

                ist = input_streams[input_files[map->file_index]->ist_index + map->stream_index];
                if(o->subtitle_disable && ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE)
                    continue;
                if(o->   audio_disable && ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
                    continue;
                if(o->   video_disable && ist->st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
                    continue;
                if(o->    data_disable && ist->st->codec->codec_type == AVMEDIA_TYPE_DATA)
                    continue;

                ost = NULL;
                switch (ist->st->codec->codec_type) {
                case AVMEDIA_TYPE_VIDEO:      ost = new_video_stream     (o, oc, src_idx); break;
                case AVMEDIA_TYPE_AUDIO:      ost = new_audio_stream     (o, oc, src_idx); break;
                case AVMEDIA_TYPE_SUBTITLE:   ost = new_subtitle_stream  (o, oc, src_idx); break;
                case AVMEDIA_TYPE_DATA:       ost = new_data_stream      (o, oc, src_idx); break;
                case AVMEDIA_TYPE_ATTACHMENT: ost = new_attachment_stream(o, oc, src_idx); break;
                case AVMEDIA_TYPE_UNKNOWN:
                    if (copy_unknown_streams) {
                        ost = new_unknown_stream   (o, oc, src_idx);
                        break;
                    }
                default:
                    av_log(NULL, ignore_unknown_streams ? AV_LOG_WARNING : AV_LOG_FATAL,
                           "Cannot map stream #%d:%d - unsupported type.\n",
                           map->file_index, map->stream_index);
                    if (!ignore_unknown_streams) {
                        av_log(NULL, AV_LOG_FATAL,
                               "If you want unsupported types ignored instead "
                               "of failing, please use the -ignore_unknown option\n"
                               "If you want them copied, please use -copy_unknown\n");
                        exit_program(1);
                    }
                }
                if (ost)
                    ost->sync_ist = input_streams[  input_files[map->sync_file_index]->ist_index
                                                  + map->sync_stream_index];
            }
        }
    }

    /* handle attached files */
    for (i = 0; i < o->nb_attachments; i++) {
        AVIOContext *pb;
        uint8_t *attachment;
        const char *p;
        int64_t len;

        if ((err = avio_open2(&pb, o->attachments[i], AVIO_FLAG_READ, &int_cb, NULL)) < 0) {
            av_log(NULL, AV_LOG_FATAL, "Could not open attachment file %s.\n",
                   o->attachments[i]);
            exit_program(1);
        }
        if ((len = avio_size(pb)) <= 0) {
            av_log(NULL, AV_LOG_FATAL, "Could not get size of the attachment %s.\n",
                   o->attachments[i]);
            exit_program(1);
        }
        if (!(attachment = av_malloc(len))) {
            av_log(NULL, AV_LOG_FATAL, "Attachment %s too large to fit into memory.\n",
                   o->attachments[i]);
            exit_program(1);
        }
        avio_read(pb, attachment, len);

        ost = new_attachment_stream(o, oc, -1);
        ost->stream_copy               = 1;
        ost->attachment_filename       = o->attachments[i];
        ost->finished                  = 1;
        ost->st->codec->extradata      = attachment;
        ost->st->codec->extradata_size = len;

        p = strrchr(o->attachments[i], '/');
        av_dict_set(&ost->st->metadata, "filename", (p && *p) ? p + 1 : o->attachments[i], AV_DICT_DONT_OVERWRITE);
        avio_closep(&pb);
    }

    for (i = nb_output_streams - oc->nb_streams; i < nb_output_streams; i++) { //for all streams of this output file
        AVDictionaryEntry *e;
        ost = output_streams[i];

        if ((ost->stream_copy || ost->attachment_filename)
            && (e = av_dict_get(o->g->codec_opts, "flags", NULL, AV_DICT_IGNORE_SUFFIX))
            && (!e->key[5] || check_stream_specifier(oc, ost->st, e->key+6)))
            if (av_opt_set(ost->st->codec, "flags", e->value, 0) < 0)
                exit_program(1);
    }

    if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
        av_dump_format(oc, nb_output_files - 1, oc->filename, 1);
        av_log(NULL, AV_LOG_ERROR, "Output file #%d does not contain any stream\n", nb_output_files - 1);
        exit_program(1);
    }

    /* check if all codec options have been used */
    unused_opts = strip_specifiers(o->g->codec_opts);
    for (i = of->ost_index; i < nb_output_streams; i++) {
        e = NULL;
        while ((e = av_dict_get(output_streams[i]->encoder_opts, "", e,
                                AV_DICT_IGNORE_SUFFIX)))
            av_dict_set(&unused_opts, e->key, NULL, 0);
    }

    e = NULL;
    while ((e = av_dict_get(unused_opts, "", e, AV_DICT_IGNORE_SUFFIX))) {
        const AVClass *class = avcodec_get_class();
        const AVOption *option = av_opt_find(&class, e->key, NULL, 0,
                                             AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
        const AVClass *fclass = avformat_get_class();
        const AVOption *foption = av_opt_find(&fclass, e->key, NULL, 0,
                                              AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ);
        if (!option || foption)
            continue;


        if (!(option->flags & AV_OPT_FLAG_ENCODING_PARAM)) {
            av_log(NULL, AV_LOG_ERROR, "Codec AVOption %s (%s) specified for "
                   "output file #%d (%s) is not an encoding option.\n", e->key,
                   option->help ? option->help : "", nb_output_files - 1,
                   filename);
            exit_program(1);
        }

        // gop_timecode is injected by generic code but not always used
        if (!strcmp(e->key, "gop_timecode"))
            continue;

        av_log(NULL, AV_LOG_WARNING, "Codec AVOption %s (%s) specified for "
               "output file #%d (%s) has not been used for any stream. The most "
               "likely reason is either wrong type (e.g. a video option with "
               "no video streams) or that it is a private option of some encoder "
               "which was not actually used for any stream.\n", e->key,
               option->help ? option->help : "", nb_output_files - 1, filename);
    }
    av_dict_free(&unused_opts);

    /* set the encoding/decoding_needed flags */
    for (i = of->ost_index; i < nb_output_streams; i++) {
        OutputStream *ost = output_streams[i];

        ost->encoding_needed = !ost->stream_copy;
        if (ost->encoding_needed && ost->source_index >= 0) {
            InputStream *ist = input_streams[ost->source_index];
            ist->decoding_needed |= DECODING_FOR_OST;
        }
    }

    /* check filename in case of an image number is expected */
    if (oc->oformat->flags & AVFMT_NEEDNUMBER) {
        if (!av_filename_number_test(oc->filename)) {
            print_error(oc->filename, AVERROR(EINVAL));
            exit_program(1);
        }
    }

    if (!(oc->oformat->flags & AVFMT_NOSTREAMS) && !input_stream_potentially_available) {
        av_log(NULL, AV_LOG_ERROR,
               "No input streams but output needs an input stream\n");
        exit_program(1);
    }

    if (!(oc->oformat->flags & AVFMT_NOFILE)) {
        /* test if it already exists to avoid losing precious files */
        assert_file_overwrite(filename);

        /* open the file */
        if ((err = avio_open2(&oc->pb, filename, AVIO_FLAG_WRITE,
                              &oc->interrupt_callback,
                              &of->opts)) < 0) {
            print_error(filename, err);
            exit_program(1);
        }
    } else if (strcmp(oc->oformat->name, "image2")==0 && !av_filename_number_test(filename))
        assert_file_overwrite(filename);

    if (o->mux_preload) {
        av_dict_set_int(&of->opts, "preload", o->mux_preload*AV_TIME_BASE, 0);
    }
    oc->max_delay = (int)(o->mux_max_delay * AV_TIME_BASE);

    /* copy metadata */
    for (i = 0; i < o->nb_metadata_map; i++) {
        char *p;
        int in_file_index = strtol(o->metadata_map[i].u.str, &p, 0);

        if (in_file_index >= nb_input_files) {
            av_log(NULL, AV_LOG_FATAL, "Invalid input file index %d while processing metadata maps\n", in_file_index);
            exit_program(1);
        }
        copy_metadata(o->metadata_map[i].specifier, *p ? p + 1 : p, oc,
                      in_file_index >= 0 ?
                      input_files[in_file_index]->ctx : NULL, o);
    }

    /* copy chapters */
    if (o->chapters_input_file >= nb_input_files) {
        if (o->chapters_input_file == INT_MAX) {
            /* copy chapters from the first input file that has them*/
            o->chapters_input_file = -1;
            for (i = 0; i < nb_input_files; i++)
                if (input_files[i]->ctx->nb_chapters) {
                    o->chapters_input_file = i;
                    break;
                }
        } else {
            av_log(NULL, AV_LOG_FATAL, "Invalid input file index %d in chapter mapping.\n",
                   o->chapters_input_file);
            exit_program(1);
        }
    }
    if (o->chapters_input_file >= 0)
        copy_chapters(input_files[o->chapters_input_file], of,
                      !o->metadata_chapters_manual);

    /* copy global metadata by default */
    if (!o->metadata_global_manual && nb_input_files){
        av_dict_copy(&oc->metadata, input_files[0]->ctx->metadata,
                     AV_DICT_DONT_OVERWRITE);
        if(o->recording_time != INT64_MAX)
            av_dict_set(&oc->metadata, "duration", NULL, 0);
        av_dict_set(&oc->metadata, "creation_time", NULL, 0);
    }
    if (!o->metadata_streams_manual)
        for (i = of->ost_index; i < nb_output_streams; i++) {
            InputStream *ist;
            if (output_streams[i]->source_index < 0)         /* this is true e.g. for attached files */
                continue;
            ist = input_streams[output_streams[i]->source_index];
            av_dict_copy(&output_streams[i]->st->metadata, ist->st->metadata, AV_DICT_DONT_OVERWRITE);
            if (!output_streams[i]->stream_copy) {
                av_dict_set(&output_streams[i]->st->metadata, "encoder", NULL, 0);
                if (ist->autorotate)
                    av_dict_set(&output_streams[i]->st->metadata, "rotate", NULL, 0);
            }
        }

    /* process manually set programs */
    for (i = 0; i < o->nb_program; i++) {
        const char *p = o->program[i].u.str;
        int progid = i+1;
        AVProgram *program;

        while(*p) {
            const char *p2 = av_get_token(&p, ":");
            char *key;
            if (!p2)
                break;
            if(*p) p++;

            key = av_get_token(&p2, "=");
            if (!key || !*p2)
                break;
            p2++;

            if (!strcmp(key, "program_num"))
                progid = strtol(p2, NULL, 0);
        }

        program = av_new_program(oc, progid);

        p = o->program[i].u.str;
        while(*p) {
            const char *p2 = av_get_token(&p, ":");
            char *key;
            if (!p2)
                break;
            if(*p) p++;

            key = av_get_token(&p2, "=");
            if (!key) {
                av_log(NULL, AV_LOG_FATAL,
                       "No '=' character in program string %s.\n",
                       p2);
                exit_program(1);
            }
            if (!*p2)
                exit_program(1);
            p2++;

            if (!strcmp(key, "title")) {
                av_dict_set(&program->metadata, "title", p2, 0);
            } else if (!strcmp(key, "program_num")) {
            } else if (!strcmp(key, "st")) {
                int st_num = strtol(p2, NULL, 0);
                av_program_add_stream_index(oc, progid, st_num);
            } else {
                av_log(NULL, AV_LOG_FATAL, "Unknown program key %s.\n", key);
                exit_program(1);
            }
        }
    }

    /* process manually set metadata */
    for (i = 0; i < o->nb_metadata; i++) {
        AVDictionary **m;
        char type, *val;
        const char *stream_spec;
        int index = 0, j, ret = 0;
        char now_time[256];

        val = strchr(o->metadata[i].u.str, '=');
        if (!val) {
            av_log(NULL, AV_LOG_FATAL, "No '=' character in metadata string %s.\n",
                   o->metadata[i].u.str);
            exit_program(1);
        }
        *val++ = 0;

        if (!strcmp(o->metadata[i].u.str, "creation_time") &&
            !strcmp(val, "now")) {
            time_t now = time(0);
            struct tm *ptm, tmbuf;
            ptm = localtime_r(&now, &tmbuf);
            if (ptm) {
                if (strftime(now_time, sizeof(now_time), "%Y-%m-%d %H:%M:%S", ptm))
                    val = now_time;
            }
        }

        parse_meta_type(o->metadata[i].specifier, &type, &index, &stream_spec);
        if (type == 's') {
            for (j = 0; j < oc->nb_streams; j++) {
                ost = output_streams[nb_output_streams - oc->nb_streams + j];
                if ((ret = check_stream_specifier(oc, oc->streams[j], stream_spec)) > 0) {
                    av_dict_set(&oc->streams[j]->metadata, o->metadata[i].u.str, *val ? val : NULL, 0);
                    if (!strcmp(o->metadata[i].u.str, "rotate")) {
                        ost->rotate_overridden = 1;
                    }
                } else if (ret < 0)
                    exit_program(1);
            }
        }
        else {
            switch (type) {
            case 'g':
                m = &oc->metadata;
                break;
            case 'c':
                if (index < 0 || index >= oc->nb_chapters) {
                    av_log(NULL, AV_LOG_FATAL, "Invalid chapter index %d in metadata specifier.\n", index);
                    exit_program(1);
                }
                m = &oc->chapters[index]->metadata;
                break;
            case 'p':
                if (index < 0 || index >= oc->nb_programs) {
                    av_log(NULL, AV_LOG_FATAL, "Invalid program index %d in metadata specifier.\n", index);
                    exit_program(1);
                }
                m = &oc->programs[index]->metadata;
                break;
            default:
                av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", o->metadata[i].specifier);
                exit_program(1);
            }
            av_dict_set(m, o->metadata[i].u.str, *val ? val : NULL, 0);
        }
    }

    return 0;
}

static int opt_target(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    enum { PAL, NTSC, FILM, UNKNOWN } norm = UNKNOWN;
    static const char *const frame_rates[] = { "25", "30000/1001", "24000/1001" };

    if (!strncmp(arg, "pal-", 4)) {
        norm = PAL;
        arg += 4;
    } else if (!strncmp(arg, "ntsc-", 5)) {
        norm = NTSC;
        arg += 5;
    } else if (!strncmp(arg, "film-", 5)) {
        norm = FILM;
        arg += 5;
    } else {
        /* Try to determine PAL/NTSC by peeking in the input files */
        if (nb_input_files) {
            int i, j, fr;
            for (j = 0; j < nb_input_files; j++) {
                for (i = 0; i < input_files[j]->nb_streams; i++) {
                    AVCodecContext *c = input_files[j]->ctx->streams[i]->codec;
                    if (c->codec_type != AVMEDIA_TYPE_VIDEO ||
                        !c->time_base.num)
                        continue;
                    fr = c->time_base.den * 1000 / c->time_base.num;
                    if (fr == 25000) {
                        norm = PAL;
                        break;
                    } else if ((fr == 29970) || (fr == 23976)) {
                        norm = NTSC;
                        break;
                    }
                }
                if (norm != UNKNOWN)
                    break;
            }
        }
        if (norm != UNKNOWN)
            av_log(NULL, AV_LOG_INFO, "Assuming %s for target.\n", norm == PAL ? "PAL" : "NTSC");
    }

    if (norm == UNKNOWN) {
        av_log(NULL, AV_LOG_FATAL, "Could not determine norm (PAL/NTSC/NTSC-Film) for target.\n");
        av_log(NULL, AV_LOG_FATAL, "Please prefix target with \"pal-\", \"ntsc-\" or \"film-\",\n");
        av_log(NULL, AV_LOG_FATAL, "or set a framerate with \"-r xxx\".\n");
        exit_program(1);
    }

    if (!strcmp(arg, "vcd")) {
        opt_video_codec(o, "c:v", "mpeg1video");
        opt_audio_codec(o, "c:a", "mp2");
        parse_option(o, "f", "vcd", options);

        parse_option(o, "s", norm == PAL ? "352x288" : "352x240", options);
        parse_option(o, "r", frame_rates[norm], options);
        opt_default(NULL, "g", norm == PAL ? "15" : "18");

        opt_default(NULL, "b:v", "1150000");
        opt_default(NULL, "maxrate:v", "1150000");
        opt_default(NULL, "minrate:v", "1150000");
        opt_default(NULL, "bufsize:v", "327680"); // 40*1024*8;

        opt_default(NULL, "b:a", "224000");
        parse_option(o, "ar", "44100", options);
        parse_option(o, "ac", "2", options);

        opt_default(NULL, "packetsize", "2324");
        opt_default(NULL, "muxrate", "1411200"); // 2352 * 75 * 8;

        /* We have to offset the PTS, so that it is consistent with the SCR.
           SCR starts at 36000, but the first two packs contain only padding
           and the first pack from the other stream, respectively, may also have
           been written before.
           So the real data starts at SCR 36000+3*1200. */
        o->mux_preload = (36000 + 3 * 1200) / 90000.0; // 0.44
    } else if (!strcmp(arg, "svcd")) {

        opt_video_codec(o, "c:v", "mpeg2video");
        opt_audio_codec(o, "c:a", "mp2");
        parse_option(o, "f", "svcd", options);

        parse_option(o, "s", norm == PAL ? "480x576" : "480x480", options);
        parse_option(o, "r", frame_rates[norm], options);
        parse_option(o, "pix_fmt", "yuv420p", options);
        opt_default(NULL, "g", norm == PAL ? "15" : "18");

        opt_default(NULL, "b:v", "2040000");
        opt_default(NULL, "maxrate:v", "2516000");
        opt_default(NULL, "minrate:v", "0"); // 1145000;
        opt_default(NULL, "bufsize:v", "1835008"); // 224*1024*8;
        opt_default(NULL, "scan_offset", "1");

        opt_default(NULL, "b:a", "224000");
        parse_option(o, "ar", "44100", options);

        opt_default(NULL, "packetsize", "2324");

    } else if (!strcmp(arg, "dvd")) {

        opt_video_codec(o, "c:v", "mpeg2video");
        opt_audio_codec(o, "c:a", "ac3");
        parse_option(o, "f", "dvd", options);

        parse_option(o, "s", norm == PAL ? "720x576" : "720x480", options);
        parse_option(o, "r", frame_rates[norm], options);
        parse_option(o, "pix_fmt", "yuv420p", options);
        opt_default(NULL, "g", norm == PAL ? "15" : "18");

        opt_default(NULL, "b:v", "6000000");
        opt_default(NULL, "maxrate:v", "9000000");
        opt_default(NULL, "minrate:v", "0"); // 1500000;
        opt_default(NULL, "bufsize:v", "1835008"); // 224*1024*8;

        opt_default(NULL, "packetsize", "2048");  // from www.mpucoder.com: DVD sectors contain 2048 bytes of data, this is also the size of one pack.
        opt_default(NULL, "muxrate", "10080000"); // from mplex project: data_rate = 1260000. mux_rate = data_rate * 8

        opt_default(NULL, "b:a", "448000");
        parse_option(o, "ar", "48000", options);

    } else if (!strncmp(arg, "dv", 2)) {

        parse_option(o, "f", "dv", options);

        parse_option(o, "s", norm == PAL ? "720x576" : "720x480", options);
        parse_option(o, "pix_fmt", !strncmp(arg, "dv50", 4) ? "yuv422p" :
                          norm == PAL ? "yuv420p" : "yuv411p", options);
        parse_option(o, "r", frame_rates[norm], options);

        parse_option(o, "ar", "48000", options);
        parse_option(o, "ac", "2", options);

    } else {
        av_log(NULL, AV_LOG_ERROR, "Unknown target: %s\n", arg);
        return AVERROR(EINVAL);
    }

    av_dict_copy(&o->g->codec_opts,  codec_opts, AV_DICT_DONT_OVERWRITE);
    av_dict_copy(&o->g->format_opts, format_opts, AV_DICT_DONT_OVERWRITE);

    return 0;
}

static int opt_vstats_file(void *optctx, const char *opt, const char *arg)
{
    av_free (vstats_filename);
    vstats_filename = av_strdup (arg);
    return 0;
}

static int opt_vstats(void *optctx, const char *opt, const char *arg)
{
    char filename[40];
    time_t today2 = time(NULL);
    struct tm *today = localtime(&today2);

    if (!today) { // maybe tomorrow
        av_log(NULL, AV_LOG_FATAL, "Unable to get current time: %s\n", strerror(errno));
        exit_program(1);
    }

    snprintf(filename, sizeof(filename), "vstats_%02d%02d%02d.log", today->tm_hour, today->tm_min,
             today->tm_sec);
    return opt_vstats_file(NULL, opt, filename);
}

static int opt_video_frames(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "frames:v", arg, options);
}

static int opt_audio_frames(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "frames:a", arg, options);
}

static int opt_data_frames(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "frames:d", arg, options);
}

static int opt_default_new(OptionsContext *o, const char *opt, const char *arg)
{
    int ret;
    AVDictionary *cbak = codec_opts;
    AVDictionary *fbak = format_opts;
    codec_opts = NULL;
    format_opts = NULL;

    ret = opt_default(NULL, opt, arg);

    av_dict_copy(&o->g->codec_opts , codec_opts, 0);
    av_dict_copy(&o->g->format_opts, format_opts, 0);
    av_dict_free(&codec_opts);
    av_dict_free(&format_opts);
    codec_opts = cbak;
    format_opts = fbak;

    return ret;
}

static int opt_preset(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    FILE *f=NULL;
    char filename[1000], line[1000], tmp_line[1000];
    const char *codec_name = NULL;

    tmp_line[0] = *opt;
    tmp_line[1] = 0;
    MATCH_PER_TYPE_OPT(codec_names, str, codec_name, NULL, tmp_line);

    if (!(f = get_preset_file(filename, sizeof(filename), arg, *opt == 'f', codec_name))) {
        if(!strncmp(arg, "libx264-lossless", strlen("libx264-lossless"))){
            av_log(NULL, AV_LOG_FATAL, "Please use -preset <speed> -qp 0\n");
        }else
            av_log(NULL, AV_LOG_FATAL, "File for preset '%s' not found\n", arg);
        exit_program(1);
    }

    while (fgets(line, sizeof(line), f)) {
        char *key = tmp_line, *value, *endptr;

        if (strcspn(line, "#\n\r") == 0)
            continue;
        av_strlcpy(tmp_line, line, sizeof(tmp_line));
        if (!av_strtok(key,   "=",    &value) ||
            !av_strtok(value, "\r\n", &endptr)) {
            av_log(NULL, AV_LOG_FATAL, "%s: Invalid syntax: '%s'\n", filename, line);
            exit_program(1);
        }
        av_log(NULL, AV_LOG_DEBUG, "ffpreset[%s]: set '%s' = '%s'\n", filename, key, value);

        if      (!strcmp(key, "acodec")) opt_audio_codec   (o, key, value);
        else if (!strcmp(key, "vcodec")) opt_video_codec   (o, key, value);
        else if (!strcmp(key, "scodec")) opt_subtitle_codec(o, key, value);
        else if (!strcmp(key, "dcodec")) opt_data_codec    (o, key, value);
        else if (opt_default_new(o, key, value) < 0) {
            av_log(NULL, AV_LOG_FATAL, "%s: Invalid option or argument: '%s', parsed as '%s' = '%s'\n",
                   filename, line, key, value);
            exit_program(1);
        }
    }

    fclose(f);

    return 0;
}

static int opt_old2new(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    char *s = av_asprintf("%s:%c", opt + 1, *opt);
    int ret = parse_option(o, s, arg, options);
    av_free(s);
    return ret;
}

static int opt_bitrate(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;

    if(!strcmp(opt, "ab")){
        av_dict_set(&o->g->codec_opts, "b:a", arg, 0);
        return 0;
    } else if(!strcmp(opt, "b")){
        av_log(NULL, AV_LOG_WARNING, "Please use -b:a or -b:v, -b is ambiguous\n");
        av_dict_set(&o->g->codec_opts, "b:v", arg, 0);
        return 0;
    }
    av_dict_set(&o->g->codec_opts, opt, arg, 0);
    return 0;
}

static int opt_qscale(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    char *s;
    int ret;
    if(!strcmp(opt, "qscale")){
        av_log(NULL, AV_LOG_WARNING, "Please use -q:a or -q:v, -qscale is ambiguous\n");
        return parse_option(o, "q:v", arg, options);
    }
    s = av_asprintf("q%s", opt + 6);
    ret = parse_option(o, s, arg, options);
    av_free(s);
    return ret;
}

static int opt_profile(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    if(!strcmp(opt, "profile")){
        av_log(NULL, AV_LOG_WARNING, "Please use -profile:a or -profile:v, -profile is ambiguous\n");
        av_dict_set(&o->g->codec_opts, "profile:v", arg, 0);
        return 0;
    }
    av_dict_set(&o->g->codec_opts, opt, arg, 0);
    return 0;
}

static int opt_video_filters(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "filter:v", arg, options);
}

static int opt_audio_filters(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "filter:a", arg, options);
}

static int opt_vsync(void *optctx, const char *opt, const char *arg)
{
    if      (!av_strcasecmp(arg, "cfr"))         video_sync_method = VSYNC_CFR;
    else if (!av_strcasecmp(arg, "vfr"))         video_sync_method = VSYNC_VFR;
    else if (!av_strcasecmp(arg, "passthrough")) video_sync_method = VSYNC_PASSTHROUGH;
    else if (!av_strcasecmp(arg, "drop"))        video_sync_method = VSYNC_DROP;

    if (video_sync_method == VSYNC_AUTO)
        video_sync_method = parse_number_or_die("vsync", arg, OPT_INT, VSYNC_AUTO, VSYNC_VFR);
    return 0;
}

static int opt_timecode(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    char *tcr = av_asprintf("timecode=%s", arg);
    int ret = parse_option(o, "metadata:g", tcr, options);
    if (ret >= 0)
        ret = av_dict_set(&o->g->codec_opts, "gop_timecode", arg, 0);
    av_free(tcr);
    return 0;
}

static int opt_channel_layout(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    char layout_str[32];
    char *stream_str;
    char *ac_str;
    int ret, channels, ac_str_size;
    uint64_t layout;

    layout = av_get_channel_layout(arg);
    if (!layout) {
        av_log(NULL, AV_LOG_ERROR, "Unknown channel layout: %s\n", arg);
        return AVERROR(EINVAL);
    }
    snprintf(layout_str, sizeof(layout_str), "%"PRIu64, layout);
    ret = opt_default_new(o, opt, layout_str);
    if (ret < 0)
        return ret;

    /* set 'ac' option based on channel layout */
    channels = av_get_channel_layout_nb_channels(layout);
    snprintf(layout_str, sizeof(layout_str), "%d", channels);
    stream_str = strchr(opt, ':');
    ac_str_size = 3 + (stream_str ? strlen(stream_str) : 0);
    ac_str = av_mallocz(ac_str_size);
    if (!ac_str)
        return AVERROR(ENOMEM);
    av_strlcpy(ac_str, "ac", 3);
    if (stream_str)
        av_strlcat(ac_str, stream_str, ac_str_size);
    ret = parse_option(o, ac_str, layout_str, options);
    av_free(ac_str);

    return ret;
}

static int opt_audio_qscale(void *optctx, const char *opt, const char *arg)
{
    OptionsContext *o = optctx;
    return parse_option(o, "q:a", arg, options);
}

static int opt_filter_complex(void *optctx, const char *opt, const char *arg)
{
    GROW_ARRAY(filtergraphs, nb_filtergraphs);
    if (!(filtergraphs[nb_filtergraphs - 1] = av_mallocz(sizeof(*filtergraphs[0]))))
        return AVERROR(ENOMEM);
    filtergraphs[nb_filtergraphs - 1]->index      = nb_filtergraphs - 1;
    filtergraphs[nb_filtergraphs - 1]->graph_desc = av_strdup(arg);
    if (!filtergraphs[nb_filtergraphs - 1]->graph_desc)
        return AVERROR(ENOMEM);

    input_stream_potentially_available = 1;

    return 0;
}

static int opt_filter_complex_script(void *optctx, const char *opt, const char *arg)
{
    uint8_t *graph_desc = read_file(arg);
    if (!graph_desc)
        return AVERROR(EINVAL);

    GROW_ARRAY(filtergraphs, nb_filtergraphs);
    if (!(filtergraphs[nb_filtergraphs - 1] = av_mallocz(sizeof(*filtergraphs[0]))))
        return AVERROR(ENOMEM);
    filtergraphs[nb_filtergraphs - 1]->index      = nb_filtergraphs - 1;
    filtergraphs[nb_filtergraphs - 1]->graph_desc = graph_desc;

    input_stream_potentially_available = 1;

    return 0;
}

void show_help_default(const char *opt, const char *arg)
{
    /* per-file options have at least one of those set */
    const int per_file = OPT_SPEC | OPT_OFFSET | OPT_PERFILE;
    int show_advanced = 0, show_avoptions = 0;

    if (opt && *opt) {
        if (!strcmp(opt, "long"))
            show_advanced = 1;
        else if (!strcmp(opt, "full"))
            show_advanced = show_avoptions = 1;
        else
            av_log(NULL, AV_LOG_ERROR, "Unknown help option '%s'.\n", opt);
    }

    show_usage();

    printf("Getting help:\n"
           "    -h      -- print basic options\n"
           "    -h long -- print more options\n"
           "    -h full -- print all options (including all format and codec specific options, very long)\n"
           "    -h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter\n"
           "    See man %s for detailed description of the options.\n"
           "\n", program_name);

    show_help_options(options, "Print help / information / capabilities:",
                      OPT_EXIT, 0, 0);

    show_help_options(options, "Global options (affect whole program "
                      "instead of just one file:",
                      0, per_file | OPT_EXIT | OPT_EXPERT, 0);
    if (show_advanced)
        show_help_options(options, "Advanced global options:", OPT_EXPERT,
                          per_file | OPT_EXIT, 0);

    show_help_options(options, "Per-file main options:", 0,
                      OPT_EXPERT | OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE |
                      OPT_EXIT, per_file);
    if (show_advanced)
        show_help_options(options, "Advanced per-file options:",
                          OPT_EXPERT, OPT_AUDIO | OPT_VIDEO | OPT_SUBTITLE, per_file);

    show_help_options(options, "Video options:",
                      OPT_VIDEO, OPT_EXPERT | OPT_AUDIO, 0);
    if (show_advanced)
        show_help_options(options, "Advanced Video options:",
                          OPT_EXPERT | OPT_VIDEO, OPT_AUDIO, 0);

    show_help_options(options, "Audio options:",
                      OPT_AUDIO, OPT_EXPERT | OPT_VIDEO, 0);
    if (show_advanced)
        show_help_options(options, "Advanced Audio options:",
                          OPT_EXPERT | OPT_AUDIO, OPT_VIDEO, 0);
    show_help_options(options, "Subtitle options:",
                      OPT_SUBTITLE, 0, 0);
    printf("\n");

    if (show_avoptions) {
        int flags = AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_ENCODING_PARAM;
        show_help_children(avcodec_get_class(), flags);
        show_help_children(avformat_get_class(), flags);
#if CONFIG_SWSCALE
        show_help_children(sws_get_class(), flags);
#endif
        show_help_children(swr_get_class(), AV_OPT_FLAG_AUDIO_PARAM);
        show_help_children(avfilter_get_class(), AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM);
    }
}

void show_usage(void)
{
    av_log(NULL, AV_LOG_INFO, "Hyper fast Audio and Video encoder\n");
    av_log(NULL, AV_LOG_INFO, "usage: %s [options] [[infile options] -i infile]... {[outfile options] outfile}...\n", program_name);
    av_log(NULL, AV_LOG_INFO, "\n");
}

enum OptGroup {
    GROUP_OUTFILE,
    GROUP_INFILE,
};

static const OptionGroupDef groups[] = {
    [GROUP_OUTFILE] = { "output file",  NULL, OPT_OUTPUT },
    [GROUP_INFILE]  = { "input file",   "i",  OPT_INPUT },
};

static int open_files(OptionGroupList *l, const char *inout,
                      int (*open_file)(OptionsContext*, const char*))
{
    int i, ret;

    for (i = 0; i < l->nb_groups; i++) {
        OptionGroup *g = &l->groups[i];
        OptionsContext o;

        init_options(&o);
        o.g = g;

        ret = parse_optgroup(&o, g);
        if (ret < 0) {
            av_log(NULL, AV_LOG_ERROR, "Error parsing options for %s file "