avconv.c:3067: error: Null Dereference
  pointer `meta_in` last assigned on line 3001 could be null and is dereferenced at line 3067, column 32.

avconv.c:2999:1: start of procedure copy_metadata()
2997. }
2998. 
2999. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
      ^
3000. {
3001.     AVDictionary **meta_in = NULL;

avconv.c:3001:5: 
2999. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
3000. {
3001.     AVDictionary **meta_in = NULL;
          ^
3002.     AVDictionary **meta_out;
3003.     int i, ret = 0;

avconv.c:3003:5: 
3001.     AVDictionary **meta_in = NULL;
3002.     AVDictionary **meta_out;
3003.     int i, ret = 0;
          ^
3004.     char type_in, type_out;
3005.     const char *istream_spec = NULL, *ostream_spec = NULL;

avconv.c:3005:5: 
3003.     int i, ret = 0;
3004.     char type_in, type_out;
3005.     const char *istream_spec = NULL, *ostream_spec = NULL;
          ^
3006.     int idx_in = 0, idx_out = 0;
3007. 

avconv.c:3006:5: 
3004.     char type_in, type_out;
3005.     const char *istream_spec = NULL, *ostream_spec = NULL;
3006.     int idx_in = 0, idx_out = 0;
          ^
3007. 
3008.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);

avconv.c:3008:5: 
3006.     int idx_in = 0, idx_out = 0;
3007. 
3008.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
          ^
3009.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
3010. 

avconv.c:2972:1: start of procedure parse_meta_type()
  2970.  * @param stream_spec for type s, the stream specifier is written here
  2971.  */
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
        ^
  2973. {
  2974.     if (*arg) {

avconv.c:2974:9: Taking true branch
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2973. {
  2974.     if (*arg) {
                ^
  2975.         *type = *arg;
  2976.         switch (*arg) {

avconv.c:2975:9: 
  2973. {
  2974.     if (*arg) {
  2975.         *type = *arg;
                ^
  2976.         switch (*arg) {
  2977.         case 'g':

avconv.c:2976:9: 
  2974.     if (*arg) {
  2975.         *type = *arg;
  2976.         switch (*arg) {
                ^
  2977.         case 'g':
  2978.             break;

avconv.c:2977:9: Switch condition is false. Skipping switch case
  2975.         *type = *arg;
  2976.         switch (*arg) {
  2977.         case 'g':
                ^
  2978.             break;
  2979.         case 's':

avconv.c:2979:9: Switch condition is false. Skipping switch case
  2977.         case 'g':
  2978.             break;
  2979.         case 's':
                ^
  2980.             if (*(++arg) && *arg != ':') {
  2981.                 av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);

avconv.c:2986:9: Switch condition is false. Skipping switch case
  2984.             *stream_spec = *arg == ':' ? arg + 1 : "";
  2985.             break;
  2986.         case 'c':
                ^
  2987.         case 'p':
  2988.             if (*(++arg) == ':')

avconv.c:2987:9: Switch condition is false. Skipping switch case
  2985.             break;
  2986.         case 'c':
  2987.         case 'p':
                ^
  2988.             if (*(++arg) == ':')
  2989.                 *index = strtol(++arg, NULL, 0);

avconv.c:2992:13: Skipping av_log(): empty list of specs
  2990.             break;
  2991.         default:
  2992.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
                    ^
  2993.             exit_program(1);
  2994.         }

avconv.c:2993:13: Skipping exit_program(): empty list of specs
  2991.         default:
  2992.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
  2993.             exit_program(1);
                    ^
  2994.         }
  2995.     } else

avconv.c:2974:5: 
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2973. {
  2974.     if (*arg) {
            ^
  2975.         *type = *arg;
  2976.         switch (*arg) {

avconv.c:2997:1: return from a call to parse_meta_type
  2995.     } else
  2996.         *type = 'g';
  2997. }
        ^
  2998. 
  2999. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)

avconv.c:3009:5: 
3007. 
3008.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
3009.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
          ^
3010. 
3011.     if (type_in == 'g' || type_out == 'g')

avconv.c:2972:1: start of procedure parse_meta_type()
  2970.  * @param stream_spec for type s, the stream specifier is written here
  2971.  */
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
        ^
  2973. {
  2974.     if (*arg) {

avconv.c:2974:9: Taking true branch
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2973. {
  2974.     if (*arg) {
                ^
  2975.         *type = *arg;
  2976.         switch (*arg) {

avconv.c:2975:9: 
  2973. {
  2974.     if (*arg) {
  2975.         *type = *arg;
                ^
  2976.         switch (*arg) {
  2977.         case 'g':

avconv.c:2976:9: 
  2974.     if (*arg) {
  2975.         *type = *arg;
  2976.         switch (*arg) {
                ^
  2977.         case 'g':
  2978.             break;

avconv.c:2977:9: Switch condition is false. Skipping switch case
  2975.         *type = *arg;
  2976.         switch (*arg) {
  2977.         case 'g':
                ^
  2978.             break;
  2979.         case 's':

avconv.c:2979:9: Switch condition is false. Skipping switch case
  2977.         case 'g':
  2978.             break;
  2979.         case 's':
                ^
  2980.             if (*(++arg) && *arg != ':') {
  2981.                 av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);

avconv.c:2986:9: Switch condition is false. Skipping switch case
  2984.             *stream_spec = *arg == ':' ? arg + 1 : "";
  2985.             break;
  2986.         case 'c':
                ^
  2987.         case 'p':
  2988.             if (*(++arg) == ':')

avconv.c:2987:9: Switch condition is false. Skipping switch case
  2985.             break;
  2986.         case 'c':
  2987.         case 'p':
                ^
  2988.             if (*(++arg) == ':')
  2989.                 *index = strtol(++arg, NULL, 0);

avconv.c:2992:13: Skipping av_log(): empty list of specs
  2990.             break;
  2991.         default:
  2992.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
                    ^
  2993.             exit_program(1);
  2994.         }

avconv.c:2993:13: Skipping exit_program(): empty list of specs
  2991.         default:
  2992.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
  2993.             exit_program(1);
                    ^
  2994.         }
  2995.     } else

avconv.c:2974:5: 
  2972. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2973. {
  2974.     if (*arg) {
            ^
  2975.         *type = *arg;
  2976.         switch (*arg) {

avconv.c:2997:1: return from a call to parse_meta_type
  2995.     } else
  2996.         *type = 'g';
  2997. }
        ^
  2998. 
  2999. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)

avconv.c:3011:9: Taking false branch
3009.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
3010. 
3011.     if (type_in == 'g' || type_out == 'g')
              ^
3012.         o->metadata_global_manual = 1;
3013.     if (type_in == 's' || type_out == 's')

avconv.c:3011:27: Taking false branch
3009.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
3010. 
3011.     if (type_in == 'g' || type_out == 'g')
                                ^
3012.         o->metadata_global_manual = 1;
3013.     if (type_in == 's' || type_out == 's')

avconv.c:3013:9: Taking false branch
3011.     if (type_in == 'g' || type_out == 'g')
3012.         o->metadata_global_manual = 1;
3013.     if (type_in == 's' || type_out == 's')
              ^
3014.         o->metadata_streams_manual = 1;
3015.     if (type_in == 'c' || type_out == 'c')

avconv.c:3013:27: Taking false branch
3011.     if (type_in == 'g' || type_out == 'g')
3012.         o->metadata_global_manual = 1;
3013.     if (type_in == 's' || type_out == 's')
                                ^
3014.         o->metadata_streams_manual = 1;
3015.     if (type_in == 'c' || type_out == 'c')

avconv.c:3015:9: Taking false branch
3013.     if (type_in == 's' || type_out == 's')
3014.         o->metadata_streams_manual = 1;
3015.     if (type_in == 'c' || type_out == 'c')
              ^
3016.         o->metadata_chapters_manual = 1;
3017. 

avconv.c:3015:27: Taking false branch
3013.     if (type_in == 's' || type_out == 's')
3014.         o->metadata_streams_manual = 1;
3015.     if (type_in == 'c' || type_out == 'c')
                                ^
3016.         o->metadata_chapters_manual = 1;
3017. 

avconv.c:3040:5: Switch condition is false. Skipping switch case
3038.         }\
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
3042. 

avconv.c:3040:5: Switch condition is false. Skipping switch case
3038.         }\
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
3042. 

avconv.c:3040:5: Switch condition is false. Skipping switch case
3038.         }\
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
3042. 

avconv.c:3041:5: Switch condition is false. Skipping switch case
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
3042. 
3043.     /* for input streams choose first matching stream */

avconv.c:3041:5: Switch condition is false. Skipping switch case
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
3042. 
3043.     /* for input streams choose first matching stream */

avconv.c:3041:5: Switch condition is false. Skipping switch case
3039. 
3040.     SET_DICT(type_in, meta_in, ic, idx_in);
3041.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
3042. 
3043.     /* for input streams choose first matching stream */

avconv.c:3044:9: Taking false branch
3042. 
3043.     /* for input streams choose first matching stream */
3044.     if (type_in == 's') {
              ^
3045.         for (i = 0; i < ic->nb_streams; i++) {
3046.             if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {

avconv.c:3058:9: Taking false branch
3056.     }
3057. 
3058.     if (type_out == 's') {
              ^
3059.         for (i = 0; i < oc->nb_streams; i++) {
3060.             if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {

avconv.c:3067:9: 
3065.         }
3066.     } else
3067.         av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
              ^
3068. 
3069.     return 0;

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}']