ffmpeg.c:3752: error: Null Dereference
  pointer `oc` last assigned on line 3730 could be null and is dereferenced at line 3752, column 5.

ffmpeg.c:3719:1: start of procedure opt_output_file()
3717. }
3718. 
3719. static void opt_output_file(const char *filename)
      ^
3720. {
3721.     AVFormatContext *oc;

ffmpeg.c:3724:5: 
3722.     int err, use_video, use_audio, use_subtitle, use_data;
3723.     int input_has_video, input_has_audio, input_has_subtitle, input_has_data;
3724.     AVFormatParameters params, *ap = &params;
          ^
3725.     AVOutputFormat *file_oformat;
3726. 

ffmpeg.c:3727:10: Taking false branch
3725.     AVOutputFormat *file_oformat;
3726. 
3727.     if (!strcmp(filename, "-"))
               ^
3728.         filename = "pipe:";
3729. 

ffmpeg.c:3730:5: 
3728.         filename = "pipe:";
3729. 
3730.     oc = avformat_alloc_context();
          ^
3731.     if (!oc) {
3732.         print_error(filename, AVERROR(ENOMEM));

libavformat/options.c:78:1: start of procedure avformat_alloc_context()
  76. }
  77. 
  78. AVFormatContext *avformat_alloc_context(void)
      ^
  79. {
  80.     AVFormatContext *ic;

libavformat/options.c:81:5: 
  79. {
  80.     AVFormatContext *ic;
  81.     ic = av_malloc(sizeof(AVFormatContext));
          ^
  82.     if (!ic) return ic;
  83.     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:82:10: Taking true branch
  80.     AVFormatContext *ic;
  81.     ic = av_malloc(sizeof(AVFormatContext));
  82.     if (!ic) return ic;
               ^
  83.     avformat_get_context_defaults(ic);
  84.     ic->av_class = &av_format_context_class;

libavformat/options.c:82:14: 
  80.     AVFormatContext *ic;
  81.     ic = av_malloc(sizeof(AVFormatContext));
  82.     if (!ic) return ic;
                   ^
  83.     avformat_get_context_defaults(ic);
  84.     ic->av_class = &av_format_context_class;

libavformat/options.c:86:1: return from a call to avformat_alloc_context
  84.     ic->av_class = &av_format_context_class;
  85.     return ic;
  86. }
      ^

ffmpeg.c:3731:10: Taking true branch
3729. 
3730.     oc = avformat_alloc_context();
3731.     if (!oc) {
               ^
3732.         print_error(filename, AVERROR(ENOMEM));
3733.         ffmpeg_exit(1);

ffmpeg.c:3732:9: 
3730.     oc = avformat_alloc_context();
3731.     if (!oc) {
3732.         print_error(filename, AVERROR(ENOMEM));
              ^
3733.         ffmpeg_exit(1);
3734.     }

cmdutils.c:437:1: start of procedure print_error()
  435. }
  436. 
  437. void print_error(const char *filename, int err)
       ^
  438. {
  439.     char errbuf[128];

cmdutils.c:440:5: 
  438. {
  439.     char errbuf[128];
  440.     const char *errbuf_ptr = errbuf;
           ^
  441. 
  442.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)

cmdutils.c:442:9: Taking true branch
  440.     const char *errbuf_ptr = errbuf;
  441. 
  442.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
               ^
  443.         errbuf_ptr = strerror(AVUNERROR(err));
  444.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);

cmdutils.c:443:9: Skipping strerror(): method has no implementation
  441. 
  442.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  443.         errbuf_ptr = strerror(AVUNERROR(err));
               ^
  444.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
  445. }

cmdutils.c:444:5: 
  442.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  443.         errbuf_ptr = strerror(AVUNERROR(err));
  444.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
           ^
  445. }
  446. 

cmdutils.c:445:1: return from a call to print_error
  443.         errbuf_ptr = strerror(AVUNERROR(err));
  444.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
  445. }
       ^
  446. 
  447. static int warned_cfg = 0;

ffmpeg.c:3733:9: Skipping ffmpeg_exit(): empty list of specs
3731.     if (!oc) {
3732.         print_error(filename, AVERROR(ENOMEM));
3733.         ffmpeg_exit(1);
              ^
3734.     }
3735. 

ffmpeg.c:3736:9: Taking true branch
3734.     }
3735. 
3736.     if (last_asked_format) {
              ^
3737.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3738.         if (!file_oformat) {

ffmpeg.c:3737:9: Skipping av_guess_format(): empty list of specs
3735. 
3736.     if (last_asked_format) {
3737.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
              ^
3738.         if (!file_oformat) {
3739.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);

ffmpeg.c:3738:14: Taking false branch
3736.     if (last_asked_format) {
3737.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3738.         if (!file_oformat) {
                   ^
3739.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);
3740.             ffmpeg_exit(1);

ffmpeg.c:3742:9: 
3740.             ffmpeg_exit(1);
3741.         }
3742.         last_asked_format = NULL;
              ^
3743.     } else {
3744.         file_oformat = av_guess_format(NULL, filename, NULL);

ffmpeg.c:3752:5: 
3750.     }
3751. 
3752.     oc->oformat = file_oformat;
          ^
3753.     av_strlcpy(oc->filename, filename, sizeof(oc->filename));
3754. 
