avconv.c:3320: error: Null Dereference
  pointer `oc` last assigned on line 3299 could be null and is dereferenced at line 3320, column 5.

avconv.c:3287:1: start of procedure opt_output_file()
3285. }
3286. 
3287. static void opt_output_file(void *optctx, const char *filename)
      ^
3288. {
3289.     OptionsContext *o = optctx;

avconv.c:3289:5: 
3287. static void opt_output_file(void *optctx, const char *filename)
3288. {
3289.     OptionsContext *o = optctx;
          ^
3290.     AVFormatContext *oc;
3291.     int i, err;

avconv.c:3296:10: Taking true branch
3294.     InputStream  *ist;
3295. 
3296.     if (!strcmp(filename, "-"))
               ^
3297.         filename = "pipe:";
3298. 

avconv.c:3297:9: 
3295. 
3296.     if (!strcmp(filename, "-"))
3297.         filename = "pipe:";
              ^
3298. 
3299.     oc = avformat_alloc_context();

avconv.c:3299:5: 
3297.         filename = "pipe:";
3298. 
3299.     oc = avformat_alloc_context();
          ^
3300.     if (!oc) {
3301.         print_error(filename, AVERROR(ENOMEM));

libavformat/options.c:118:1: start of procedure avformat_alloc_context()
  116. }
  117. 
  118. AVFormatContext *avformat_alloc_context(void)
       ^
  119. {
  120.     AVFormatContext *ic;

libavformat/options.c:121:5: 
  119. {
  120.     AVFormatContext *ic;
  121.     ic = av_malloc(sizeof(AVFormatContext));
           ^
  122.     if (!ic) return ic;
  123.     avformat_get_context_defaults(ic);

libavutil/mem.c:64:1: start of procedure av_malloc()
    62.    linker will do it automatically. */
    63. 
    64. void *av_malloc(size_t size)
        ^
    65. {
    66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
    64. void *av_malloc(size_t size)
    65. {
    66.     void *ptr = NULL;
            ^
    67. #if CONFIG_MEMALIGN_HACK
    68.     long diff;

libavutil/mem.c:72:8: Taking false branch
    70. 
    71.     /* let's disallow possible ambiguous cases */
    72.     if(size > (INT_MAX-32) )
               ^
    73.         return NULL;
    74. 

libavutil/mem.c:83:9: Taking false branch
    81.     ((char*)ptr)[-1]= diff;
    82. #elif HAVE_POSIX_MEMALIGN
    83.     if (posix_memalign(&ptr,32,size))
                ^
    84.         ptr = NULL;
    85. #elif HAVE_MEMALIGN

libavutil/mem.c:114:5: 
    112.     ptr = malloc(size);
    113. #endif
    114.     return ptr;
             ^
    115. }
    116. 

libavutil/mem.c:115:1: return from a call to av_malloc
    113. #endif
    114.     return ptr;
    115. }
         ^
    116. 
    117. void *av_realloc(void *ptr, size_t size)

libavformat/options.c:122:10: Taking true branch
  120.     AVFormatContext *ic;
  121.     ic = av_malloc(sizeof(AVFormatContext));
  122.     if (!ic) return ic;
                ^
  123.     avformat_get_context_defaults(ic);
  124.     return ic;

libavformat/options.c:122:14: 
  120.     AVFormatContext *ic;
  121.     ic = av_malloc(sizeof(AVFormatContext));
  122.     if (!ic) return ic;
                    ^
  123.     avformat_get_context_defaults(ic);
  124.     return ic;

libavformat/options.c:125:1: return from a call to avformat_alloc_context
  123.     avformat_get_context_defaults(ic);
  124.     return ic;
  125. }
       ^
  126. 
  127. const AVClass *avformat_get_class(void)

avconv.c:3300:10: Taking true branch
3298. 
3299.     oc = avformat_alloc_context();
3300.     if (!oc) {
               ^
3301.         print_error(filename, AVERROR(ENOMEM));
3302.         exit_program(1);

avconv.c:3301:9: 
3299.     oc = avformat_alloc_context();
3300.     if (!oc) {
3301.         print_error(filename, AVERROR(ENOMEM));
              ^
3302.         exit_program(1);
3303.     }

cmdutils.c:423:1: start of procedure print_error()
  421. }
  422. 
  423. void print_error(const char *filename, int err)
       ^
  424. {
  425.     char errbuf[128];

cmdutils.c:426:5: 
  424. {
  425.     char errbuf[128];
  426.     const char *errbuf_ptr = errbuf;
           ^
  427. 
  428.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)

cmdutils.c:428:9: Taking true branch
  426.     const char *errbuf_ptr = errbuf;
  427. 
  428.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
               ^
  429.         errbuf_ptr = strerror(AVUNERROR(err));
  430.     av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);

cmdutils.c:429:9: Skipping strerror(): method has no implementation
  427. 
  428.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  429.         errbuf_ptr = strerror(AVUNERROR(err));
               ^
  430.     av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
  431. }

cmdutils.c:430:5: Skipping av_log(): empty list of specs
  428.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  429.         errbuf_ptr = strerror(AVUNERROR(err));
  430.     av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
           ^
  431. }
  432. 

cmdutils.c:431:1: return from a call to print_error
  429.         errbuf_ptr = strerror(AVUNERROR(err));
  430.     av_log(NULL, AV_LOG_ERROR, "%s: %s\n", filename, errbuf_ptr);
  431. }
       ^
  432. 
  433. static int warned_cfg = 0;

avconv.c:3302:9: Skipping exit_program(): empty list of specs
3300.     if (!oc) {
3301.         print_error(filename, AVERROR(ENOMEM));
3302.         exit_program(1);
              ^
3303.     }
3304. 

avconv.c:3305:9: Taking true branch
3303.     }
3304. 
3305.     if (o->format) {
              ^
3306.         file_oformat = av_guess_format(o->format, NULL, NULL);
3307.         if (!file_oformat) {

avconv.c:3306:9: Skipping av_guess_format(): empty list of specs
3304. 
3305.     if (o->format) {
3306.         file_oformat = av_guess_format(o->format, NULL, NULL);
              ^
3307.         if (!file_oformat) {
3308.             av_log(NULL, AV_LOG_FATAL, "Requested output format '%s' is not a suitable output format\n", o->format);

avconv.c:3307:14: Taking false branch
3305.     if (o->format) {
3306.         file_oformat = av_guess_format(o->format, NULL, NULL);
3307.         if (!file_oformat) {
                   ^
3308.             av_log(NULL, AV_LOG_FATAL, "Requested output format '%s' is not a suitable output format\n", o->format);
3309.             exit_program(1);

avconv.c:3320:5: 
3318.     }
3319. 
3320.     oc->oformat = file_oformat;
          ^
3321.     av_strlcpy(oc->filename, filename, sizeof(oc->filename));
3322. 
