ffmpeg.c

    return 0;
}

static int opt_video_channel(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -channel.\n");
    return opt_default("channel", arg);
}

static int opt_video_standard(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -standard.\n");
    return opt_default("standard", arg);
}

static int opt_codec(const char *opt, const char *arg)
{
    int *pstream_copy; char **pcodec_name; enum AVMediaType codec_type;

    if      (!strcmp(opt, "acodec")) { pstream_copy = &audio_stream_copy;    pcodec_name = &audio_codec_name;    codec_type = AVMEDIA_TYPE_AUDIO;    }
    else if (!strcmp(opt, "vcodec")) { pstream_copy = &video_stream_copy;    pcodec_name = &video_codec_name;    codec_type = AVMEDIA_TYPE_VIDEO;    }
    else if (!strcmp(opt, "scodec")) { pstream_copy = &subtitle_stream_copy; pcodec_name = &subtitle_codec_name; codec_type = AVMEDIA_TYPE_SUBTITLE; }
    else if (!strcmp(opt, "dcodec")) { pstream_copy = &data_stream_copy;     pcodec_name = &data_codec_name;     codec_type = AVMEDIA_TYPE_DATA;     }

    av_freep(pcodec_name);
    if (!strcmp(arg, "copy")) {
        *pstream_copy = 1;
    } else {
        *pcodec_name = av_strdup(arg);
    }
    return 0;
}

static int opt_codec_tag(const char *opt, const char *arg)
{
    char *tail;
    uint32_t *codec_tag;

    codec_tag = !strcmp(opt, "atag") ? &audio_codec_tag :
                !strcmp(opt, "vtag") ? &video_codec_tag :
                !strcmp(opt, "stag") ? &subtitle_codec_tag : NULL;
    if (!codec_tag)
        return -1;

    *codec_tag = strtol(arg, &tail, 0);
    if (!tail || *tail)
        *codec_tag = AV_RL32(arg);

    return 0;
}

static int opt_map(const char *opt, const char *arg)
{
    StreamMap *m;
    char *p;

    stream_maps = grow_array(stream_maps, sizeof(*stream_maps), &nb_stream_maps, nb_stream_maps + 1);
    m = &stream_maps[nb_stream_maps-1];

    m->file_index = strtol(arg, &p, 0);
    if (*p)
        p++;

    m->stream_index = strtol(p, &p, 0);
    if (*p) {
        p++;
        m->sync_file_index = strtol(p, &p, 0);
        if (*p)
            p++;
        m->sync_stream_index = strtol(p, &p, 0);
    } else {
        m->sync_file_index = m->file_index;
        m->sync_stream_index = m->stream_index;
    }
    return 0;
}

static void parse_meta_type(char *arg, char *type, int *index)
{
    if (*arg == ':') {
        *type = *(++arg);
        switch (*arg) {
        case 'g':
            break;
        case 's':
        case 'c':
        case 'p':
            if (*(++arg) == ':')
                *index = strtol(++arg, NULL, 0);
            break;
        default:
            fprintf(stderr, "Invalid metadata type %c.\n", *arg);
            exit_program(1);
        }
    } else
        *type = 'g';
}

static int opt_map_metadata(const char *opt, const char *arg)
{
    MetadataMap *m, *m1;
    char *p;

    meta_data_maps = grow_array(meta_data_maps, sizeof(*meta_data_maps),
                                &nb_meta_data_maps, nb_meta_data_maps + 1);

    m = &meta_data_maps[nb_meta_data_maps - 1][1];
    m->file = strtol(arg, &p, 0);
    parse_meta_type(p, &m->type, &m->index);

    m1 = &meta_data_maps[nb_meta_data_maps - 1][0];
    if (p = strchr(opt, ':'))
        parse_meta_type(p, &m1->type, &m1->index);
    else
        m1->type = 'g';

    if (m->type == 'g' || m1->type == 'g')
        metadata_global_autocopy = 0;
    if (m->type == 's' || m1->type == 's')
        metadata_streams_autocopy = 0;
    if (m->type == 'c' || m1->type == 'c')
        metadata_chapters_autocopy = 0;

    return 0;
}

static int opt_map_meta_data(const char *opt, const char *arg)
{
    fprintf(stderr, "-map_meta_data is deprecated and will be removed soon. "
                    "Use -map_metadata instead.\n");
    return opt_map_metadata(opt, arg);
}

static int opt_input_ts_scale(const char *opt, const char *arg)
{
    unsigned int stream;
    double scale;
    char *p;

    stream = strtol(arg, &p, 0);
    if (*p)
        p++;
    scale= strtod(p, &p);

    if(stream >= MAX_STREAMS)
        exit_program(1);

    ts_scale = grow_array(ts_scale, sizeof(*ts_scale), &nb_ts_scale, stream + 1);
    ts_scale[stream] = scale;
    return 0;
}

static int opt_recording_time(const char *opt, const char *arg)
{
    recording_time = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_start_time(const char *opt, const char *arg)
{
    start_time = parse_time_or_die(opt, arg, 1);
    return 0;
}

static int opt_recording_timestamp(const char *opt, const char *arg)
{
    char buf[128];
    int64_t recording_timestamp = parse_time_or_die(opt, arg, 0) / 1E6;
    struct tm time = *gmtime((time_t*)&recording_timestamp);
    strftime(buf, sizeof(buf), "creation_time=%FT%T%z", &time);
    opt_metadata("metadata", buf);

    av_log(NULL, AV_LOG_WARNING, "%s is deprecated, set the 'creation_time' metadata "
                                 "tag instead.\n", opt);
    return 0;
}

static int opt_input_ts_offset(const char *opt, const char *arg)
{
    input_ts_offset = parse_time_or_die(opt, arg, 1);
    return 0;
}

static enum CodecID find_codec_or_die(const char *name, int type, int encoder)
{
    const char *codec_string = encoder ? "encoder" : "decoder";
    AVCodec *codec;

    if(!name)
        return CODEC_ID_NONE;
    codec = encoder ?
        avcodec_find_encoder_by_name(name) :
        avcodec_find_decoder_by_name(name);
    if(!codec) {
        fprintf(stderr, "Unknown %s '%s'\n", codec_string, name);
        exit_program(1);
    }
    if(codec->type != type) {
        fprintf(stderr, "Invalid %s type '%s'\n", codec_string, name);
        exit_program(1);
    }
    return codec->id;
}

static int opt_input_file(const char *opt, const char *filename)
{
    AVFormatContext *ic;
    AVInputFormat *file_iformat = NULL;
    int err, i, ret, rfps, rfps_base;
    int64_t timestamp;
    uint8_t buf[128];
    AVDictionary **opts;
    int orig_nb_streams;                     // number of streams before avformat_find_stream_info

    if (last_asked_format) {
        if (!(file_iformat = av_find_input_format(last_asked_format))) {
            fprintf(stderr, "Unknown input format: '%s'\n", last_asked_format);
            exit_program(1);
        }
        last_asked_format = NULL;
    }

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    using_stdin |= !strncmp(filename, "pipe:", 5) ||
                    !strcmp(filename, "/dev/stdin");

    /* get default parameters from command line */
    ic = avformat_alloc_context();
    if (!ic) {
        print_error(filename, AVERROR(ENOMEM));
        exit_program(1);
    }
    if (audio_sample_rate) {
        snprintf(buf, sizeof(buf), "%d", audio_sample_rate);
        av_dict_set(&format_opts, "sample_rate", buf, 0);
    }
    if (audio_channels) {
        snprintf(buf, sizeof(buf), "%d", audio_channels);
        av_dict_set(&format_opts, "channels", buf, 0);
    }
    if (frame_rate.num) {
        snprintf(buf, sizeof(buf), "%d/%d", frame_rate.num, frame_rate.den);
        av_dict_set(&format_opts, "framerate", buf, 0);
    }
    if (frame_width && frame_height) {
        snprintf(buf, sizeof(buf), "%dx%d", frame_width, frame_height);
        av_dict_set(&format_opts, "video_size", buf, 0);
    }
    if (frame_pix_fmt != PIX_FMT_NONE)
        av_dict_set(&format_opts, "pixel_format", av_get_pix_fmt_name(frame_pix_fmt), 0);

    ic->video_codec_id   =
        find_codec_or_die(video_codec_name   , AVMEDIA_TYPE_VIDEO   , 0);
    ic->audio_codec_id   =
        find_codec_or_die(audio_codec_name   , AVMEDIA_TYPE_AUDIO   , 0);
    ic->subtitle_codec_id=
        find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 0);
    ic->flags |= AVFMT_FLAG_NONBLOCK;

    if (loop_input) {
        av_log(NULL, AV_LOG_WARNING, "-loop_input is deprecated, use -loop 1\n");
        ic->loop_input = loop_input;
    }

    /* open the input file with generic libav function */
    err = avformat_open_input(&ic, filename, file_iformat, &format_opts);
    if (err < 0) {
        print_error(filename, err);
        exit_program(1);
    }
    assert_avoptions(format_opts);

    if(opt_programid) {
        int i, j;
        int found=0;
        for(i=0; i<ic->nb_streams; i++){
            ic->streams[i]->discard= AVDISCARD_ALL;
        }
        for(i=0; i<ic->nb_programs; i++){
            AVProgram *p= ic->programs[i];
            if(p->id != opt_programid){
                p->discard = AVDISCARD_ALL;
            }else{
                found=1;
                for(j=0; j<p->nb_stream_indexes; j++){
                    ic->streams[p->stream_index[j]]->discard= AVDISCARD_DEFAULT;
                }
            }
        }
        if(!found){
            fprintf(stderr, "Specified program id not found\n");
            exit_program(1);
        }
        opt_programid=0;
    }

    /* Set AVCodecContext options for avformat_find_stream_info */
    opts = setup_find_stream_info_opts(ic, codec_opts);
    orig_nb_streams = ic->nb_streams;

    /* If not enough info to get the stream parameters, we decode the
       first frames to get it. (used in mpeg case for example) */
    ret = avformat_find_stream_info(ic, opts);
    if (ret < 0 && verbose >= 0) {
        fprintf(stderr, "%s: could not find codec parameters\n", filename);
        av_close_input_file(ic);
        exit_program(1);
    }

    timestamp = start_time;
    /* add the stream start time */
    if (ic->start_time != AV_NOPTS_VALUE)
        timestamp += ic->start_time;

    /* if seeking requested, we execute it */
    if (start_time != 0) {
        ret = av_seek_frame(ic, -1, timestamp, AVSEEK_FLAG_BACKWARD);
        if (ret < 0) {
            fprintf(stderr, "%s: could not seek to position %0.3f\n",
                    filename, (double)timestamp / AV_TIME_BASE);
        }
        /* reset seek info */
        start_time = 0;
    }

    /* update the current parameters so that they match the one of the input stream */
    for(i=0;i<ic->nb_streams;i++) {
        AVStream *st = ic->streams[i];
        AVCodecContext *dec = st->codec;
        InputStream *ist;

        dec->thread_count = thread_count;

        input_streams = grow_array(input_streams, sizeof(*input_streams), &nb_input_streams, nb_input_streams + 1);
        ist = &input_streams[nb_input_streams - 1];
        ist->st = st;
        ist->file_index = nb_input_files;
        ist->discard = 1;
        ist->opts = filter_codec_opts(codec_opts, ist->st->codec->codec_id, ic, st);

        if (i < nb_ts_scale)
            ist->ts_scale = ts_scale[i];

        switch (dec->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            ist->dec = avcodec_find_decoder_by_name(audio_codec_name);
            if(!ist->dec)
                ist->dec = avcodec_find_decoder(dec->codec_id);
            if(audio_disable)
                st->discard= AVDISCARD_ALL;
            break;
        case AVMEDIA_TYPE_VIDEO:
            ist->dec= avcodec_find_decoder_by_name(video_codec_name);
            if(!ist->dec)
                ist->dec = avcodec_find_decoder(dec->codec_id);
            rfps      = ic->streams[i]->r_frame_rate.num;
            rfps_base = ic->streams[i]->r_frame_rate.den;
            if (dec->lowres) {
                dec->flags |= CODEC_FLAG_EMU_EDGE;
            }
            if(me_threshold)
                dec->debug |= FF_DEBUG_MV;

            if (dec->time_base.den != rfps*dec->ticks_per_frame || dec->time_base.num != rfps_base) {

                if (verbose >= 0)
                    fprintf(stderr,"\nSeems stream %d codec frame rate differs from container frame rate: %2.2f (%d/%d) -> %2.2f (%d/%d)\n",
                            i, (float)dec->time_base.den / dec->time_base.num, dec->time_base.den, dec->time_base.num,

                    (float)rfps / rfps_base, rfps, rfps_base);
            }

            if(video_disable)
                st->discard= AVDISCARD_ALL;
            else if(video_discard)
                st->discard= video_discard;
            break;
        case AVMEDIA_TYPE_DATA:
            break;
        case AVMEDIA_TYPE_SUBTITLE:
            ist->dec = avcodec_find_decoder_by_name(subtitle_codec_name);
            if(!ist->dec)
                ist->dec = avcodec_find_decoder(dec->codec_id);
            if(subtitle_disable)
                st->discard = AVDISCARD_ALL;
            break;
        case AVMEDIA_TYPE_ATTACHMENT:
        case AVMEDIA_TYPE_UNKNOWN:
            break;
        default:
            abort();
        }
    }

    /* dump the file content */
    if (verbose >= 0)
        av_dump_format(ic, nb_input_files, filename, 0);

    input_files = grow_array(input_files, sizeof(*input_files), &nb_input_files, nb_input_files + 1);
    input_files[nb_input_files - 1].ctx        = ic;
    input_files[nb_input_files - 1].ist_index  = nb_input_streams - ic->nb_streams;
    input_files[nb_input_files - 1].ts_offset  = input_ts_offset - (copy_ts ? 0 : timestamp);
    input_files[nb_input_files - 1].nb_streams = ic->nb_streams;

    top_field_first = -1;
    frame_rate    = (AVRational){0, 0};
    frame_pix_fmt = PIX_FMT_NONE;
    frame_height = 0;
    frame_width  = 0;
    audio_sample_rate = 0;
    audio_channels    = 0;
    audio_sample_fmt  = AV_SAMPLE_FMT_NONE;
    av_freep(&ts_scale);
    nb_ts_scale = 0;

    for (i = 0; i < orig_nb_streams; i++)
        av_dict_free(&opts[i]);
    av_freep(&opts);
    av_freep(&video_codec_name);
    av_freep(&audio_codec_name);
    av_freep(&subtitle_codec_name);
    uninit_opts();
    init_opts();
    return 0;
}

static void check_inputs(int *has_video_ptr,
                         int *has_audio_ptr,
                         int *has_subtitle_ptr,
                         int *has_data_ptr)
{
    int has_video, has_audio, has_subtitle, has_data, i, j;
    AVFormatContext *ic;

    has_video = 0;
    has_audio = 0;
    has_subtitle = 0;
    has_data = 0;

    for(j=0;j<nb_input_files;j++) {
        ic = input_files[j].ctx;
        for(i=0;i<ic->nb_streams;i++) {
            AVCodecContext *enc = ic->streams[i]->codec;
            switch(enc->codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                has_audio = 1;
                break;
            case AVMEDIA_TYPE_VIDEO:
                has_video = 1;
                break;
            case AVMEDIA_TYPE_SUBTITLE:
                has_subtitle = 1;
                break;
            case AVMEDIA_TYPE_DATA:
            case AVMEDIA_TYPE_ATTACHMENT:
            case AVMEDIA_TYPE_UNKNOWN:
                has_data = 1;
                break;
            default:
                abort();
            }
        }
    }
    *has_video_ptr = has_video;
    *has_audio_ptr = has_audio;
    *has_subtitle_ptr = has_subtitle;
    *has_data_ptr = has_data;
}

static void new_video_stream(AVFormatContext *oc, int file_idx)
{
    AVStream *st;
    OutputStream *ost;
    AVCodecContext *video_enc;
    enum CodecID codec_id = CODEC_ID_NONE;
    AVCodec *codec= NULL;

    if(!video_stream_copy){
        if (video_codec_name) {
            codec_id = find_codec_or_die(video_codec_name, AVMEDIA_TYPE_VIDEO, 1);
            codec = avcodec_find_encoder_by_name(video_codec_name);
        } else {
            codec_id = av_guess_codec(oc->oformat, NULL, oc->filename, NULL, AVMEDIA_TYPE_VIDEO);
            codec = avcodec_find_encoder(codec_id);
        }
    }

    ost = new_output_stream(oc, file_idx, codec);
    st  = ost->st;
    if (!video_stream_copy) {
        ost->frame_aspect_ratio = frame_aspect_ratio;
        frame_aspect_ratio = 0;
#if CONFIG_AVFILTER
        ost->avfilter = vfilters;
        vfilters = NULL;
#endif
    }

    ost->bitstream_filters = video_bitstream_filters;
    video_bitstream_filters= NULL;

    st->codec->thread_count= thread_count;

    video_enc = st->codec;

    if(video_codec_tag)
        video_enc->codec_tag= video_codec_tag;

    if(oc->oformat->flags & AVFMT_GLOBALHEADER) {
        video_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }

    video_enc->codec_type = AVMEDIA_TYPE_VIDEO;
    if (video_stream_copy) {
        st->stream_copy = 1;
        video_enc->sample_aspect_ratio =
        st->sample_aspect_ratio = av_d2q(frame_aspect_ratio*frame_height/frame_width, 255);
    } else {
        const char *p;
        int i;

        if (frame_rate.num)
            ost->frame_rate = frame_rate;
        video_enc->codec_id = codec_id;

        video_enc->width = frame_width;
        video_enc->height = frame_height;
        video_enc->pix_fmt = frame_pix_fmt;
        video_enc->bits_per_raw_sample = frame_bits_per_raw_sample;
        st->sample_aspect_ratio = video_enc->sample_aspect_ratio;

        if (intra_only)
            video_enc->gop_size = 0;
        if (video_qscale || same_quality) {
            video_enc->flags |= CODEC_FLAG_QSCALE;
            video_enc->global_quality = FF_QP2LAMBDA * video_qscale;
        }

        if(intra_matrix)
            video_enc->intra_matrix = intra_matrix;
        if(inter_matrix)
            video_enc->inter_matrix = inter_matrix;

        p= video_rc_override_string;
        for(i=0; p; i++){
            int start, end, q;
            int e=sscanf(p, "%d,%d,%d", &start, &end, &q);
            if(e!=3){
                fprintf(stderr, "error parsing rc_override\n");
                exit_program(1);
            }
            video_enc->rc_override=
                av_realloc(video_enc->rc_override,
                           sizeof(RcOverride)*(i+1));
            video_enc->rc_override[i].start_frame= start;
            video_enc->rc_override[i].end_frame  = end;
            if(q>0){
                video_enc->rc_override[i].qscale= q;
                video_enc->rc_override[i].quality_factor= 1.0;
            }
            else{
                video_enc->rc_override[i].qscale= 0;
                video_enc->rc_override[i].quality_factor= -q/100.0;
            }
            p= strchr(p, '/');
            if(p) p++;
        }
        video_enc->rc_override_count=i;
        if (!video_enc->rc_initial_buffer_occupancy)
            video_enc->rc_initial_buffer_occupancy = video_enc->rc_buffer_size*3/4;
        video_enc->me_threshold= me_threshold;
        video_enc->intra_dc_precision= intra_dc_precision - 8;

        if (do_psnr)
            video_enc->flags|= CODEC_FLAG_PSNR;

        /* two pass mode */
        if (do_pass) {
            if (do_pass == 1) {
                video_enc->flags |= CODEC_FLAG_PASS1;
            } else {
                video_enc->flags |= CODEC_FLAG_PASS2;
            }
        }

        if (forced_key_frames)
            parse_forced_key_frames(forced_key_frames, ost, video_enc);
    }
    if (video_language) {
        av_dict_set(&st->metadata, "language", video_language, 0);
        av_freep(&video_language);
    }

    /* reset some key parameters */
    video_disable = 0;
    av_freep(&video_codec_name);
    av_freep(&forced_key_frames);
    video_stream_copy = 0;
    frame_pix_fmt = PIX_FMT_NONE;
}

static void new_audio_stream(AVFormatContext *oc, int file_idx)
{
    AVStream *st;
    OutputStream *ost;
    AVCodec *codec= NULL;
    AVCodecContext *audio_enc;
    enum CodecID codec_id = CODEC_ID_NONE;

    if(!audio_stream_copy){
        if (audio_codec_name) {
            codec_id = find_codec_or_die(audio_codec_name, AVMEDIA_TYPE_AUDIO, 1);
            codec = avcodec_find_encoder_by_name(audio_codec_name);
        } else {
            codec_id = av_guess_codec(oc->oformat, NULL, oc->filename, NULL, AVMEDIA_TYPE_AUDIO);
            codec = avcodec_find_encoder(codec_id);
        }
    }
    ost = new_output_stream(oc, file_idx, codec);
    st  = ost->st;

    ost->bitstream_filters = audio_bitstream_filters;
    audio_bitstream_filters= NULL;

    st->codec->thread_count= thread_count;

    audio_enc = st->codec;
    audio_enc->codec_type = AVMEDIA_TYPE_AUDIO;

    if(audio_codec_tag)
        audio_enc->codec_tag= audio_codec_tag;

    if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
        audio_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }
    if (audio_stream_copy) {
        st->stream_copy = 1;
    } else {
        audio_enc->codec_id = codec_id;

        if (audio_qscale > QSCALE_NONE) {
            audio_enc->flags |= CODEC_FLAG_QSCALE;
            audio_enc->global_quality = FF_QP2LAMBDA * audio_qscale;
        }
        if (audio_channels)
            audio_enc->channels = audio_channels;
        if (audio_sample_fmt != AV_SAMPLE_FMT_NONE)
            audio_enc->sample_fmt = audio_sample_fmt;
        if (audio_sample_rate)
            audio_enc->sample_rate = audio_sample_rate;
    }
    if (audio_language) {
        av_dict_set(&st->metadata, "language", audio_language, 0);
        av_freep(&audio_language);
    }

    /* reset some key parameters */
    audio_disable = 0;
    av_freep(&audio_codec_name);
    audio_stream_copy = 0;
}

static void new_data_stream(AVFormatContext *oc, int file_idx)
{
    AVStream *st;
    OutputStream *ost;
    AVCodecContext *data_enc;

    ost = new_output_stream(oc, file_idx, NULL);
    st  = ost->st;
    data_enc = st->codec;
    if (!data_stream_copy) {
        fprintf(stderr, "Data stream encoding not supported yet (only streamcopy)\n");
        exit_program(1);
    }

    data_enc->codec_type = AVMEDIA_TYPE_DATA;

    if (data_codec_tag)
        data_enc->codec_tag= data_codec_tag;

    if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
        data_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }
    if (data_stream_copy) {
        st->stream_copy = 1;
    }

    data_disable = 0;
    av_freep(&data_codec_name);
    data_stream_copy = 0;
}

static void new_subtitle_stream(AVFormatContext *oc, int file_idx)
{
    AVStream *st;
    OutputStream *ost;
    AVCodec *codec=NULL;
    AVCodecContext *subtitle_enc;
    enum CodecID codec_id = CODEC_ID_NONE;

    if(!subtitle_stream_copy){
        if (subtitle_codec_name) {
            codec_id = find_codec_or_die(subtitle_codec_name, AVMEDIA_TYPE_SUBTITLE, 1);
            codec = avcodec_find_encoder_by_name(subtitle_codec_name);
        } else {
            codec_id = av_guess_codec(oc->oformat, NULL, oc->filename, NULL, AVMEDIA_TYPE_SUBTITLE);
            codec = avcodec_find_encoder(codec_id);
        }
    }
    ost = new_output_stream(oc, file_idx, codec);
    st  = ost->st;
    subtitle_enc = st->codec;

    ost->bitstream_filters = subtitle_bitstream_filters;
    subtitle_bitstream_filters= NULL;

    subtitle_enc->codec_type = AVMEDIA_TYPE_SUBTITLE;

    if(subtitle_codec_tag)
        subtitle_enc->codec_tag= subtitle_codec_tag;

    if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
        subtitle_enc->flags |= CODEC_FLAG_GLOBAL_HEADER;
    }
    if (subtitle_stream_copy) {
        st->stream_copy = 1;
    } else {
        subtitle_enc->codec_id = codec_id;
    }

    if (subtitle_language) {
        av_dict_set(&st->metadata, "language", subtitle_language, 0);
        av_freep(&subtitle_language);
    }

    subtitle_disable = 0;
    av_freep(&subtitle_codec_name);
    subtitle_stream_copy = 0;
}

static int opt_new_stream(const char *opt, const char *arg)
{
    AVFormatContext *oc;
    int file_idx = nb_output_files - 1;
    if (nb_output_files <= 0) {
        fprintf(stderr, "At least one output file must be specified\n");
        exit_program(1);
    }
    oc = output_files[file_idx];

    if      (!strcmp(opt, "newvideo"   )) new_video_stream   (oc, file_idx);
    else if (!strcmp(opt, "newaudio"   )) new_audio_stream   (oc, file_idx);
    else if (!strcmp(opt, "newsubtitle")) new_subtitle_stream(oc, file_idx);
    else if (!strcmp(opt, "newdata"    )) new_data_stream    (oc, file_idx);
    else av_assert0(0);
    return 0;
}

/* arg format is "output-stream-index:streamid-value". */
static int opt_streamid(const char *opt, const char *arg)
{
    int idx;
    char *p;
    char idx_str[16];

    av_strlcpy(idx_str, arg, sizeof(idx_str));
    p = strchr(idx_str, ':');
    if (!p) {
        fprintf(stderr,
                "Invalid value '%s' for option '%s', required syntax is 'index:value'\n",
                arg, opt);
        exit_program(1);
    }
    *p++ = '\0';
    idx = parse_number_or_die(opt, idx_str, OPT_INT, 0, MAX_STREAMS-1);
    streamid_map = grow_array(streamid_map, sizeof(*streamid_map), &nb_streamid_map, idx+1);
    streamid_map[idx] = parse_number_or_die(opt, p, OPT_INT, 0, INT_MAX);
    return 0;
}

static int opt_output_file(const char *opt, const char *filename)
{
    AVFormatContext *oc;
    int i, err, use_video, use_audio, use_subtitle, use_data;
    int input_has_video, input_has_audio, input_has_subtitle, input_has_data;
    AVOutputFormat *file_oformat;

    if(nb_output_files >= FF_ARRAY_ELEMS(output_files)){
        fprintf(stderr, "Too many output files\n");
        exit_program(1);
    }

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    err = avformat_alloc_output_context2(&oc, NULL, last_asked_format, filename);
    last_asked_format = NULL;
    if (!oc) {
        print_error(filename, err);
        exit_program(1);
    }
    file_oformat= oc->oformat;

    if (!strcmp(file_oformat->name, "ffm") &&
        av_strstart(filename, "http:", NULL)) {
        /* special case for files sent to ffserver: we get the stream
           parameters from ffserver */
        int err = read_ffserver_streams(oc, filename);
        if (err < 0) {
            print_error(filename, err);
            exit_program(1);
        }
    } else {
        use_video = file_oformat->video_codec != CODEC_ID_NONE || video_stream_copy || video_codec_name;
        use_audio = file_oformat->audio_codec != CODEC_ID_NONE || audio_stream_copy || audio_codec_name;
        use_subtitle = file_oformat->subtitle_codec != CODEC_ID_NONE || subtitle_stream_copy || subtitle_codec_name;
        use_data = data_stream_copy ||  data_codec_name; /* XXX once generic data codec will be available add a ->data_codec reference and use it here */

        /* disable if no corresponding type found */
        check_inputs(&input_has_video,
                     &input_has_audio,
                     &input_has_subtitle,
                     &input_has_data);

        if (!input_has_video)
            use_video = 0;
        if (!input_has_audio)
            use_audio = 0;
        if (!input_has_subtitle)
            use_subtitle = 0;
        if (!input_has_data)
            use_data = 0;

        /* manual disable */
        if (audio_disable)    use_audio    = 0;
        if (video_disable)    use_video    = 0;
        if (subtitle_disable) use_subtitle = 0;
        if (data_disable)     use_data     = 0;

        if (use_video)    new_video_stream(oc, nb_output_files);
        if (use_audio)    new_audio_stream(oc, nb_output_files);
        if (use_subtitle) new_subtitle_stream(oc, nb_output_files);
        if (use_data)     new_data_stream(oc, nb_output_files);

        av_dict_copy(&oc->metadata, metadata, 0);
        av_dict_free(&metadata);
    }

    av_dict_copy(&output_opts[nb_output_files], format_opts, 0);
    output_files[nb_output_files++] = oc;

    /* 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_NOFILE)) {
        /* test if it already exists to avoid loosing precious files */
        if (!file_overwrite &&
            (strchr(filename, ':') == NULL ||
             filename[1] == ':' ||
             av_strstart(filename, "file:", NULL))) {
            if (avio_check(filename, 0) == 0) {
                if (!using_stdin) {
                    fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
                    fflush(stderr);
                    if (!read_yesno()) {
                        fprintf(stderr, "Not overwriting - exiting\n");
                        exit_program(1);
                    }
                }
                else {
                    fprintf(stderr,"File '%s' already exists. Exiting.\n", filename);
                    exit_program(1);
                }
            }
        }

        /* open the file */
        if ((err = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE)) < 0) {
            print_error(filename, err);
            exit_program(1);
        }
    }

    oc->preload= (int)(mux_preload*AV_TIME_BASE);
    oc->max_delay= (int)(mux_max_delay*AV_TIME_BASE);

    if (loop_output >= 0) {
        av_log(NULL, AV_LOG_WARNING, "-loop_output is deprecated, use -loop\n");
        oc->loop_output = loop_output;
    }

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

    /* copy metadata */
    for (i = 0; i < nb_meta_data_maps; i++) {
        AVFormatContext *files[2];
        AVDictionary    **meta[2];
        int j;

#define METADATA_CHECK_INDEX(index, nb_elems, desc)\
        if ((index) < 0 || (index) >= (nb_elems)) {\
            av_log(NULL, AV_LOG_ERROR, "Invalid %s index %d while processing metadata maps\n",\
                     (desc), (index));\
            exit_program(1);\
        }

        int in_file_index = meta_data_maps[i][1].file;
        if (in_file_index < 0)
            continue;
        METADATA_CHECK_INDEX(in_file_index, nb_input_files, "input file")

        files[0] = oc;
        files[1] = input_files[in_file_index].ctx;

        for (j = 0; j < 2; j++) {
            MetadataMap *map = &meta_data_maps[i][j];

            switch (map->type) {
            case 'g':
                meta[j] = &files[j]->metadata;
                break;
            case 's':
                METADATA_CHECK_INDEX(map->index, files[j]->nb_streams, "stream")
                meta[j] = &files[j]->streams[map->index]->metadata;
                break;
            case 'c':
                METADATA_CHECK_INDEX(map->index, files[j]->nb_chapters, "chapter")
                meta[j] = &files[j]->chapters[map->index]->metadata;
                break;
            case 'p':
                METADATA_CHECK_INDEX(map->index, files[j]->nb_programs, "program")
                meta[j] = &files[j]->programs[map->index]->metadata;
                break;
            }
        }

        av_dict_copy(meta[0], *meta[1], AV_DICT_DONT_OVERWRITE);
    }

    /* copy global metadata by default */
    if (metadata_global_autocopy)
        av_dict_copy(&oc->metadata, input_files[0].ctx->metadata,
                     AV_DICT_DONT_OVERWRITE);
    if (metadata_streams_autocopy)
        for (i = 0; i < oc->nb_streams; i++) {
            InputStream *ist = &input_streams[output_streams_for_file[nb_output_files-1][i]->source_index];
            av_dict_copy(&oc->streams[i]->metadata, ist->st->metadata, AV_DICT_DONT_OVERWRITE);
        }

    frame_rate    = (AVRational){0, 0};
    frame_width   = 0;
    frame_height  = 0;
    audio_sample_rate = 0;
    audio_channels    = 0;
    audio_sample_fmt  = AV_SAMPLE_FMT_NONE;
    chapters_input_file = INT_MAX;

    av_freep(&meta_data_maps);
    nb_meta_data_maps = 0;
    metadata_global_autocopy   = 1;
    metadata_streams_autocopy  = 1;
    metadata_chapters_autocopy = 1;

    av_freep(&forced_key_frames);
    uninit_opts();
    init_opts();
    return 0;
}

/* same option as mencoder */
static int opt_pass(const char *opt, const char *arg)
{
    do_pass = parse_number_or_die(opt, arg, OPT_INT, 1, 2);
    return 0;
}