ffmpeg.c:3714: error: Null Dereference
  pointer `oc` last assigned on line 3692 could be null and is dereferenced at line 3714, column 5.

ffmpeg.c:3681:1: start of procedure opt_output_file()
3679. }
3680. 
3681. static void opt_output_file(const char *filename)
      ^
3682. {
3683.     AVFormatContext *oc;

ffmpeg.c:3686:5: 
3684.     int err, use_video, use_audio, use_subtitle;
3685.     int input_has_video, input_has_audio, input_has_subtitle;
3686.     AVFormatParameters params, *ap = &params;
          ^
3687.     AVOutputFormat *file_oformat;
3688. 

ffmpeg.c:3689:10: Taking false branch
3687.     AVOutputFormat *file_oformat;
3688. 
3689.     if (!strcmp(filename, "-"))
               ^
3690.         filename = "pipe:";
3691. 

ffmpeg.c:3692:5: 
3690.         filename = "pipe:";
3691. 
3692.     oc = avformat_alloc_context();
          ^
3693.     if (!oc) {
3694.         print_error(filename, AVERROR(ENOMEM));

libavformat/options.c:82:1: start of procedure avformat_alloc_context()
  80. }
  81. 
  82. AVFormatContext *avformat_alloc_context(void)
      ^
  83. {
  84.     AVFormatContext *ic;

libavformat/options.c:85:5: 
  83. {
  84.     AVFormatContext *ic;
  85.     ic = av_malloc(sizeof(AVFormatContext));
          ^
  86.     if (!ic) return ic;
  87.     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(FF_INTERNAL_MEM_TYPE size)
        ^
    65. {
    66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
    64. void *av_malloc(FF_INTERNAL_MEM_TYPE 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-16) )
               ^
    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,16,size))
                ^
    84.         ptr = NULL;
    85. #elif HAVE_MEMALIGN

libavutil/mem.c:116:5: 
    114.     ptr = malloc(size);
    115. #endif
    116.     return ptr;
             ^
    117. }
    118. 

libavutil/mem.c:117:1: return from a call to av_malloc
    115. #endif
    116.     return ptr;
    117. }
         ^
    118. 
    119. void *av_realloc(void *ptr, FF_INTERNAL_MEM_TYPE size)

libavformat/options.c:86:10: Taking true branch
  84.     AVFormatContext *ic;
  85.     ic = av_malloc(sizeof(AVFormatContext));
  86.     if (!ic) return ic;
               ^
  87.     avformat_get_context_defaults(ic);
  88.     ic->av_class = &av_format_context_class;

libavformat/options.c:86:14: 
  84.     AVFormatContext *ic;
  85.     ic = av_malloc(sizeof(AVFormatContext));
  86.     if (!ic) return ic;
                   ^
  87.     avformat_get_context_defaults(ic);
  88.     ic->av_class = &av_format_context_class;

libavformat/options.c:90:1: return from a call to avformat_alloc_context
  88.     ic->av_class = &av_format_context_class;
  89.     return ic;
  90. }
      ^
  91. 
  92. #if FF_API_ALLOC_FORMAT_CONTEXT

ffmpeg.c:3693:10: Taking true branch
3691. 
3692.     oc = avformat_alloc_context();
3693.     if (!oc) {
               ^
3694.         print_error(filename, AVERROR(ENOMEM));
3695.         ffmpeg_exit(1);

ffmpeg.c:3694:9: 
3692.     oc = avformat_alloc_context();
3693.     if (!oc) {
3694.         print_error(filename, AVERROR(ENOMEM));
              ^
3695.         ffmpeg_exit(1);
3696.     }

cmdutils.c:370:1: start of procedure print_error()
  368. }
  369. 
  370. void print_error(const char *filename, int err)
       ^
  371. {
  372.     char errbuf[128];

cmdutils.c:373:5: 
  371. {
  372.     char errbuf[128];
  373.     const char *errbuf_ptr = errbuf;
           ^
  374. 
  375.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)

cmdutils.c:375:9: Taking true branch
  373.     const char *errbuf_ptr = errbuf;
  374. 
  375.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
               ^
  376.         errbuf_ptr = strerror(AVUNERROR(err));
  377.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);

cmdutils.c:376:9: Skipping strerror(): method has no implementation
  374. 
  375.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  376.         errbuf_ptr = strerror(AVUNERROR(err));
               ^
  377.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
  378. }

cmdutils.c:377:5: 
  375.     if (av_strerror(err, errbuf, sizeof(errbuf)) < 0)
  376.         errbuf_ptr = strerror(AVUNERROR(err));
  377.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
           ^
  378. }
  379. 

cmdutils.c:378:1: return from a call to print_error
  376.         errbuf_ptr = strerror(AVUNERROR(err));
  377.     fprintf(stderr, "%s: %s\n", filename, errbuf_ptr);
  378. }
       ^
  379. 
  380. static int warned_cfg = 0;

ffmpeg.c:3695:9: Skipping ffmpeg_exit(): empty list of specs
3693.     if (!oc) {
3694.         print_error(filename, AVERROR(ENOMEM));
3695.         ffmpeg_exit(1);
              ^
3696.     }
3697. 

ffmpeg.c:3698:9: Taking true branch
3696.     }
3697. 
3698.     if (last_asked_format) {
              ^
3699.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3700.         if (!file_oformat) {

ffmpeg.c:3699:9: Skipping av_guess_format(): empty list of specs
3697. 
3698.     if (last_asked_format) {
3699.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
              ^
3700.         if (!file_oformat) {
3701.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);

ffmpeg.c:3700:14: Taking false branch
3698.     if (last_asked_format) {
3699.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3700.         if (!file_oformat) {
                   ^
3701.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);
3702.             ffmpeg_exit(1);

ffmpeg.c:3704:9: 
3702.             ffmpeg_exit(1);
3703.         }
3704.         last_asked_format = NULL;
              ^
3705.     } else {
3706.         file_oformat = av_guess_format(NULL, filename, NULL);

ffmpeg.c:3714:5: 
3712.     }
3713. 
3714.     oc->oformat = file_oformat;
          ^
3715.     av_strlcpy(oc->filename, filename, sizeof(oc->filename));
3716. 
