avconv.c:2858: error: Null Dereference
  pointer `meta_in` last assigned on line 2792 could be null and is dereferenced at line 2858, column 32.

avconv.c:2790:1: start of procedure copy_metadata()
2788. }
2789. 
2790. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
      ^
2791. {
2792.     AVDictionary **meta_in = NULL;

avconv.c:2792:5: 
2790. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)
2791. {
2792.     AVDictionary **meta_in = NULL;
          ^
2793.     AVDictionary **meta_out;
2794.     int i, ret = 0;

avconv.c:2794:5: 
2792.     AVDictionary **meta_in = NULL;
2793.     AVDictionary **meta_out;
2794.     int i, ret = 0;
          ^
2795.     char type_in, type_out;
2796.     const char *istream_spec = NULL, *ostream_spec = NULL;

avconv.c:2796:5: 
2794.     int i, ret = 0;
2795.     char type_in, type_out;
2796.     const char *istream_spec = NULL, *ostream_spec = NULL;
          ^
2797.     int idx_in = 0, idx_out = 0;
2798. 

avconv.c:2797:5: 
2795.     char type_in, type_out;
2796.     const char *istream_spec = NULL, *ostream_spec = NULL;
2797.     int idx_in = 0, idx_out = 0;
          ^
2798. 
2799.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);

avconv.c:2799:5: 
2797.     int idx_in = 0, idx_out = 0;
2798. 
2799.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
          ^
2800.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
2801. 

avconv.c:2763:1: start of procedure parse_meta_type()
  2761.  * @param stream_spec for type s, the stream specifier is written here
  2762.  */
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
        ^
  2764. {
  2765.     if (*arg) {

avconv.c:2765:9: Taking true branch
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2764. {
  2765.     if (*arg) {
                ^
  2766.         *type = *arg;
  2767.         switch (*arg) {

avconv.c:2766:9: 
  2764. {
  2765.     if (*arg) {
  2766.         *type = *arg;
                ^
  2767.         switch (*arg) {
  2768.         case 'g':

avconv.c:2767:9: 
  2765.     if (*arg) {
  2766.         *type = *arg;
  2767.         switch (*arg) {
                ^
  2768.         case 'g':
  2769.             break;

avconv.c:2768:9: Switch condition is false. Skipping switch case
  2766.         *type = *arg;
  2767.         switch (*arg) {
  2768.         case 'g':
                ^
  2769.             break;
  2770.         case 's':

avconv.c:2770:9: Switch condition is false. Skipping switch case
  2768.         case 'g':
  2769.             break;
  2770.         case 's':
                ^
  2771.             if (*(++arg) && *arg != ':') {
  2772.                 av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);

avconv.c:2777:9: Switch condition is false. Skipping switch case
  2775.             *stream_spec = *arg == ':' ? arg + 1 : "";
  2776.             break;
  2777.         case 'c':
                ^
  2778.         case 'p':
  2779.             if (*(++arg) == ':')

avconv.c:2778:9: Switch condition is false. Skipping switch case
  2776.             break;
  2777.         case 'c':
  2778.         case 'p':
                ^
  2779.             if (*(++arg) == ':')
  2780.                 *index = strtol(++arg, NULL, 0);

avconv.c:2783:13: Skipping av_log(): empty list of specs
  2781.             break;
  2782.         default:
  2783.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
                    ^
  2784.             exit_program(1);
  2785.         }

avconv.c:2784:13: Skipping exit_program(): empty list of specs
  2782.         default:
  2783.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
  2784.             exit_program(1);
                    ^
  2785.         }
  2786.     } else

avconv.c:2765:5: 
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2764. {
  2765.     if (*arg) {
            ^
  2766.         *type = *arg;
  2767.         switch (*arg) {

avconv.c:2788:1: return from a call to parse_meta_type
  2786.     } else
  2787.         *type = 'g';
  2788. }
        ^
  2789. 
  2790. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)

avconv.c:2800:5: 
2798. 
2799.     parse_meta_type(inspec,  &type_in,  &idx_in,  &istream_spec);
2800.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
          ^
2801. 
2802.     if (type_in == 'g' || type_out == 'g')

avconv.c:2763:1: start of procedure parse_meta_type()
  2761.  * @param stream_spec for type s, the stream specifier is written here
  2762.  */
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
        ^
  2764. {
  2765.     if (*arg) {

avconv.c:2765:9: Taking true branch
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2764. {
  2765.     if (*arg) {
                ^
  2766.         *type = *arg;
  2767.         switch (*arg) {

avconv.c:2766:9: 
  2764. {
  2765.     if (*arg) {
  2766.         *type = *arg;
                ^
  2767.         switch (*arg) {
  2768.         case 'g':

avconv.c:2767:9: 
  2765.     if (*arg) {
  2766.         *type = *arg;
  2767.         switch (*arg) {
                ^
  2768.         case 'g':
  2769.             break;

avconv.c:2768:9: Switch condition is false. Skipping switch case
  2766.         *type = *arg;
  2767.         switch (*arg) {
  2768.         case 'g':
                ^
  2769.             break;
  2770.         case 's':

avconv.c:2770:9: Switch condition is false. Skipping switch case
  2768.         case 'g':
  2769.             break;
  2770.         case 's':
                ^
  2771.             if (*(++arg) && *arg != ':') {
  2772.                 av_log(NULL, AV_LOG_FATAL, "Invalid metadata specifier %s.\n", arg);

avconv.c:2777:9: Switch condition is false. Skipping switch case
  2775.             *stream_spec = *arg == ':' ? arg + 1 : "";
  2776.             break;
  2777.         case 'c':
                ^
  2778.         case 'p':
  2779.             if (*(++arg) == ':')

avconv.c:2778:9: Switch condition is false. Skipping switch case
  2776.             break;
  2777.         case 'c':
  2778.         case 'p':
                ^
  2779.             if (*(++arg) == ':')
  2780.                 *index = strtol(++arg, NULL, 0);

avconv.c:2783:13: Skipping av_log(): empty list of specs
  2781.             break;
  2782.         default:
  2783.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
                    ^
  2784.             exit_program(1);
  2785.         }

avconv.c:2784:13: Skipping exit_program(): empty list of specs
  2782.         default:
  2783.             av_log(NULL, AV_LOG_FATAL, "Invalid metadata type %c.\n", *arg);
  2784.             exit_program(1);
                    ^
  2785.         }
  2786.     } else

avconv.c:2765:5: 
  2763. static void parse_meta_type(char *arg, char *type, int *index, const char **stream_spec)
  2764. {
  2765.     if (*arg) {
            ^
  2766.         *type = *arg;
  2767.         switch (*arg) {

avconv.c:2788:1: return from a call to parse_meta_type
  2786.     } else
  2787.         *type = 'g';
  2788. }
        ^
  2789. 
  2790. static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFormatContext *ic, OptionsContext *o)

avconv.c:2802:9: Taking false branch
2800.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
2801. 
2802.     if (type_in == 'g' || type_out == 'g')
              ^
2803.         o->metadata_global_manual = 1;
2804.     if (type_in == 's' || type_out == 's')

avconv.c:2802:27: Taking false branch
2800.     parse_meta_type(outspec, &type_out, &idx_out, &ostream_spec);
2801. 
2802.     if (type_in == 'g' || type_out == 'g')
                                ^
2803.         o->metadata_global_manual = 1;
2804.     if (type_in == 's' || type_out == 's')

avconv.c:2804:9: Taking false branch
2802.     if (type_in == 'g' || type_out == 'g')
2803.         o->metadata_global_manual = 1;
2804.     if (type_in == 's' || type_out == 's')
              ^
2805.         o->metadata_streams_manual = 1;
2806.     if (type_in == 'c' || type_out == 'c')

avconv.c:2804:27: Taking false branch
2802.     if (type_in == 'g' || type_out == 'g')
2803.         o->metadata_global_manual = 1;
2804.     if (type_in == 's' || type_out == 's')
                                ^
2805.         o->metadata_streams_manual = 1;
2806.     if (type_in == 'c' || type_out == 'c')

avconv.c:2806:9: Taking false branch
2804.     if (type_in == 's' || type_out == 's')
2805.         o->metadata_streams_manual = 1;
2806.     if (type_in == 'c' || type_out == 'c')
              ^
2807.         o->metadata_chapters_manual = 1;
2808. 

avconv.c:2806:27: Taking false branch
2804.     if (type_in == 's' || type_out == 's')
2805.         o->metadata_streams_manual = 1;
2806.     if (type_in == 'c' || type_out == 'c')
                                ^
2807.         o->metadata_chapters_manual = 1;
2808. 

avconv.c:2831:5: Switch condition is false. Skipping switch case
2829.         }\
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
2833. 

avconv.c:2831:5: Switch condition is false. Skipping switch case
2829.         }\
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
2833. 

avconv.c:2831:5: Switch condition is false. Skipping switch case
2829.         }\
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
          ^
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
2833. 

avconv.c:2832:5: Switch condition is false. Skipping switch case
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
2833. 
2834.     /* for input streams choose first matching stream */

avconv.c:2832:5: Switch condition is false. Skipping switch case
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
2833. 
2834.     /* for input streams choose first matching stream */

avconv.c:2832:5: Switch condition is false. Skipping switch case
2830. 
2831.     SET_DICT(type_in, meta_in, ic, idx_in);
2832.     SET_DICT(type_out, meta_out, oc, idx_out);
          ^
2833. 
2834.     /* for input streams choose first matching stream */

avconv.c:2835:9: Taking false branch
2833. 
2834.     /* for input streams choose first matching stream */
2835.     if (type_in == 's') {
              ^
2836.         for (i = 0; i < ic->nb_streams; i++) {
2837.             if ((ret = check_stream_specifier(ic, ic->streams[i], istream_spec)) > 0) {

avconv.c:2849:9: Taking false branch
2847.     }
2848. 
2849.     if (type_out == 's') {
              ^
2850.         for (i = 0; i < oc->nb_streams; i++) {
2851.             if ((ret = check_stream_specifier(oc, oc->streams[i], ostream_spec)) > 0) {

avconv.c:2858:9: 
2856.         }
2857.     } else
2858.         av_dict_copy(meta_out, *meta_in, AV_DICT_DONT_OVERWRITE);
              ^
2859. 
2860.     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}']