static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
{
    AVDictionary **meta_in = NULL;
    AVDictionary **meta_out;
    int i, ret = 0;
    char type_in, type_out;
    const char *istream_spec = NULL, *ostream_spec = NULL;
    int idx_in = 0, idx_out = 0;
    parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
    parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
    if (type_in == 'g' || type_out == 'g')
        o->metadata_global_manual = 1;
    if (type_in == 's' || type_out == 's')
        o->metadata_streams_manual = 1;
    if (type_in == 'c' || type_out == 'c')
        o->metadata_chapters_manual = 1;
#define METADATA_CHECK_INDEX(index, nb_elems, desc)\
    if ((index) < 0 || (index) >= (nb_elems)) {\
        av_log(NULL, AV_LOG_FATAL, "Invalid %s index %d while processing metadata maps.\n",\
                (desc), (index));\
        exit_program(1);\
    }
#define SET_DICT(type, meta, context, index)\
        switch (type) {\
        case 'g':\
            meta = &context->metadata;\
            break;\
        case 'c':\
            METADATA_CHECK_INDEX(index, context->nb_chapters, "chapter")\
            meta = &context->chapters[index]->metadata;\
            break;\
        case 'p':\
            METADATA_CHECK_INDEX(index, context->nb_programs, "program")\
            meta = &context->programs[index]->metadata;\
            break;\
        }\
    SET_DICT(type_in, meta_in, ic, idx_in);
    SET_DICT(type_out, meta_out, oc, idx_out);
    if (type_in == 's') {
        for (i = 0; i < ic->nb_streams; i++) {
            if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {
                meta_in = &ic->streams[i]->metadata;
                break;
            } else if (ret < 0)
                exit_program(1);
        }
        if (!meta_in) {
            av_log(NULL, AV_LOG_FATAL, "Stream specifier %s does not match  any streams.\n", istream_spec);
            exit_program(1);
        }
    }
    if (type_out == 's') {
        for (i = 0; i < oc->nb_streams; i++) {
            if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {
                meta_out = &oc->streams[i]->metadata;
                av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
            } else if (ret < 0)
                exit_program(1);
        }
    } else
        av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
    return 0;
}
['static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)\n{\n    AVDictionary **meta_in = NULL;\n    AVDictionary **meta_out;\n    int i, ret = 0;\n    char type_in, type_out;\n    const char *istream_spec = NULL, *ostream_spec = NULL;\n    int idx_in = 0, idx_out = 0;\n    parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);\n    parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);\n    if (type_in == \'g\' || type_out == \'g\')\n        o->metadata_global_manual = 1;\n    if (type_in == \'s\' || type_out == \'s\')\n        o->metadata_streams_manual = 1;\n    if (type_in == \'c\' || type_out == \'c\')\n        o->metadata_chapters_manual = 1;\n#define METADATA_CHECK_INDEX(index, nb_elems, desc)\\\n    if ((index) < 0 || (index) >= (nb_elems)) {\\\n        av_log(NULL, AV_LOG_FATAL, "Invalid %s index %d while processing metadata maps.\\n",\\\n                (desc), (index));\\\n        exit_program(1);\\\n    }\n#define SET_DICT(type, meta, context, index)\\\n        switch (type) {\\\n        case \'g\':\\\n            meta = &context->metadata;\\\n            break;\\\n        case \'c\':\\\n            METADATA_CHECK_INDEX(index, context->nb_chapters, "chapter")\\\n            meta = &context->chapters[index]->metadata;\\\n            break;\\\n        case \'p\':\\\n            METADATA_CHECK_INDEX(index, context->nb_programs, "program")\\\n            meta = &context->programs[index]->metadata;\\\n            break;\\\n        }\\\n    SET_DICT(type_in, meta_in, ic, idx_in);\n    SET_DICT(type_out, meta_out, oc, idx_out);\n    if (type_in == \'s\') {\n        for (i = 0; i < ic->nb_streams; i++) {\n            if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {\n                meta_in = &ic->streams[i]->metadata;\n                break;\n            } else if (ret < 0)\n                exit_program(1);\n        }\n        if (!meta_in) {\n            av_log(NULL, AV_LOG_FATAL, "Stream specifier %s does not match  any streams.\\n", istream_spec);\n            exit_program(1);\n        }\n    }\n    if (type_out == \'s\') {\n        for (i = 0; i < oc->nb_streams; i++) {\n            if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {\n                meta_out = &oc->streams[i]->metadata;\n                av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);\n            } else if (ret < 0)\n                exit_program(1);\n        }\n    } else\n        av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);\n    return 0;\n}', 'static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)\n{\n    if (*arg) {\n        *type = *arg;\n        switch (*arg) {\n        case \'g\':\n            break;\n        case \'s\':\n            if (*(++arg) && *arg != \':\') {\n                av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\\n", arg);\n                exit_program(1);\n            }\n            *stream_spec = *arg == \':\' ? arg + 1 : "";\n            break;\n        case \'c\':\n        case \'p\':\n            if (*(++arg) == \':\')\n                *index = strtol(++arg, NULL, 0);\n            break;\n        default:\n            av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\\n", *arg);\n            exit_program(1);\n        }\n    } else\n        *type = \'g\';\n}']