ffmpeg.c:3647: error: Null Dereference
  pointer `streamid_map` last assigned on line 3646 could be null and is dereferenced at line 3647, column 5.

ffmpeg.c:3629:1: start of procedure opt_streamid()
3627. 
3628. /* arg format is "output-stream-index:streamid-value". */
3629. static int opt_streamid(const char *opt, const char *arg)
      ^
3630. {
3631.     int idx;

ffmpeg.c:3635:5: 
3633.     char idx_str[16];
3634. 
3635.     strncpy(idx_str, arg, sizeof(idx_str));
          ^
3636.     idx_str[sizeof(idx_str)-1] = '\0';
3637.     p = strchr(idx_str, ':');

ffmpeg.c:3636:5: 
3634. 
3635.     strncpy(idx_str, arg, sizeof(idx_str));
3636.     idx_str[sizeof(idx_str)-1] = '\0';
          ^
3637.     p = strchr(idx_str, ':');
3638.     if (!p) {

ffmpeg.c:3637:5: 
3635.     strncpy(idx_str, arg, sizeof(idx_str));
3636.     idx_str[sizeof(idx_str)-1] = '\0';
3637.     p = strchr(idx_str, ':');
          ^
3638.     if (!p) {
3639.         fprintf(stderr,

ffmpeg.c:3638:10: Taking false branch
3636.     idx_str[sizeof(idx_str)-1] = '\0';
3637.     p = strchr(idx_str, ':');
3638.     if (!p) {
               ^
3639.         fprintf(stderr,
3640.                 "Invalid value '%s' for option '%s', required syntax is 'index:value'\n",

ffmpeg.c:3644:5: 
3642.         ffmpeg_exit(1);
3643.     }
3644.     *p++ = '\0';
          ^
3645.     idx = parse_number_or_die(opt, idx_str, OPT_INT, 0, MAX_STREAMS-1);
3646.     streamid_map = grow_array(streamid_map, sizeof(*streamid_map), &nb_streamid_map, idx+1);

ffmpeg.c:3645:5: Skipping parse_number_or_die(): empty list of specs
3643.     }
3644.     *p++ = '\0';
3645.     idx = parse_number_or_die(opt, idx_str, OPT_INT, 0, MAX_STREAMS-1);
          ^
3646.     streamid_map = grow_array(streamid_map, sizeof(*streamid_map), &nb_streamid_map, idx+1);
3647.     streamid_map[idx] = parse_number_or_die(opt, p, OPT_INT, 0, INT_MAX);

ffmpeg.c:3646:5: 
3644.     *p++ = '\0';
3645.     idx = parse_number_or_die(opt, idx_str, OPT_INT, 0, MAX_STREAMS-1);
3646.     streamid_map = grow_array(streamid_map, sizeof(*streamid_map), &nb_streamid_map, idx+1);
          ^
3647.     streamid_map[idx] = parse_number_or_die(opt, p, OPT_INT, 0, INT_MAX);
3648.     return 0;

ffmpeg.c:578:1: start of procedure grow_array()
  576. 
  577. /* similar to ff_dynarray_add() and av_fast_realloc() */
  578. static void *grow_array(void *array, int elem_size, int *size, int new_size)
       ^
  579. {
  580.     if (new_size >= INT_MAX / elem_size) {

ffmpeg.c:580:9: Taking false branch
  578. static void *grow_array(void *array, int elem_size, int *size, int new_size)
  579. {
  580.     if (new_size >= INT_MAX / elem_size) {
               ^
  581.         fprintf(stderr, "Array too big.\n");
  582.         ffmpeg_exit(1);

ffmpeg.c:584:9: Taking true branch
  582.         ffmpeg_exit(1);
  583.     }
  584.     if (*size < new_size) {
               ^
  585.         uint8_t *tmp = av_realloc(array, new_size*elem_size);
  586.         if (!tmp) {

ffmpeg.c:585:9: 
  583.     }
  584.     if (*size < new_size) {
  585.         uint8_t *tmp = av_realloc(array, new_size*elem_size);
               ^
  586.         if (!tmp) {
  587.             fprintf(stderr, "Could not alloc buffer.\n");

libavutil/mem.c:119:1: start of procedure av_realloc()
    117. }
    118. 
    119. void *av_realloc(void *ptr, unsigned int size)
         ^
    120. {
    121. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:126:8: Taking true branch
    124. 
    125.     /* let's disallow possible ambiguous cases */
    126.     if(size > (INT_MAX-16) )
                ^
    127.         return NULL;
    128. 

libavutil/mem.c:127:9: 
    125.     /* let's disallow possible ambiguous cases */
    126.     if(size > (INT_MAX-16) )
    127.         return NULL;
                 ^
    128. 
    129. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:137:1: return from a call to av_realloc
    135.     return realloc(ptr, size);
    136. #endif
    137. }
         ^
    138. 
    139. void av_free(void *ptr)

ffmpeg.c:586:14: Taking true branch
  584.     if (*size < new_size) {
  585.         uint8_t *tmp = av_realloc(array, new_size*elem_size);
  586.         if (!tmp) {
                    ^
  587.             fprintf(stderr, "Could not alloc buffer.\n");
  588.             ffmpeg_exit(1);

ffmpeg.c:587:13: 
  585.         uint8_t *tmp = av_realloc(array, new_size*elem_size);
  586.         if (!tmp) {
  587.             fprintf(stderr, "Could not alloc buffer.\n");
                   ^
  588.             ffmpeg_exit(1);
  589.         }

ffmpeg.c:588:13: Skipping ffmpeg_exit(): empty list of specs
  586.         if (!tmp) {
  587.             fprintf(stderr, "Could not alloc buffer.\n");
  588.             ffmpeg_exit(1);
                   ^
  589.         }
  590.         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);

ffmpeg.c:590:9: 
  588.             ffmpeg_exit(1);
  589.         }
  590.         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
               ^
  591.         *size = new_size;
  592.         return tmp;

ffmpeg.c:591:9: 
  589.         }
  590.         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
  591.         *size = new_size;
               ^
  592.         return tmp;
  593.     }

ffmpeg.c:592:9: 
  590.         memset(tmp + *size*elem_size, 0, (new_size-*size) * elem_size);
  591.         *size = new_size;
  592.         return tmp;
               ^
  593.     }
  594.     return array;

ffmpeg.c:595:1: return from a call to grow_array
  593.     }
  594.     return array;
  595. }
       ^
  596. 
  597. static void choose_sample_fmt(AVStream *st, AVCodec *codec)

ffmpeg.c:3647:5: Skipping parse_number_or_die(): empty list of specs
3645.     idx = parse_number_or_die(opt, idx_str, OPT_INT, 0, MAX_STREAMS-1);
3646.     streamid_map = grow_array(streamid_map, sizeof(*streamid_map), &nb_streamid_map, idx+1);
3647.     streamid_map[idx] = parse_number_or_die(opt, p, OPT_INT, 0, INT_MAX);
          ^
3648.     return 0;
3649. }
