ffmpeg.c:3396: error: Null Dereference
  pointer `oc` last assigned on line 3374 could be null and is dereferenced at line 3396, column 5.

ffmpeg.c:3363:1: start of procedure opt_output_file()
3361. }
3362. 
3363. static void opt_output_file(const char *filename)
      ^
3364. {
3365.     AVFormatContext *oc;

ffmpeg.c:3368:5: 
3366.     int use_video, use_audio, use_subtitle;
3367.     int input_has_video, input_has_audio, input_has_subtitle;
3368.     AVFormatParameters params, *ap = &params;
          ^
3369.     AVOutputFormat *file_oformat;
3370. 

ffmpeg.c:3371:10: Taking false branch
3369.     AVOutputFormat *file_oformat;
3370. 
3371.     if (!strcmp(filename, "-"))
               ^
3372.         filename = "pipe:";
3373. 

ffmpeg.c:3374:5: 
3372.         filename = "pipe:";
3373. 
3374.     oc = avformat_alloc_context();
          ^
3375.     if (!oc) {
3376.         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(unsigned int size)
        ^
    65. {
    66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
    64. void *av_malloc(unsigned int 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, unsigned int 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. }
      ^
  87. 
  88. #if LIBAVFORMAT_VERSION_MAJOR < 53

ffmpeg.c:3375:10: Taking true branch
3373. 
3374.     oc = avformat_alloc_context();
3375.     if (!oc) {
               ^
3376.         print_error(filename, AVERROR(ENOMEM));
3377.         av_exit(1);

ffmpeg.c:3376:9: 
3374.     oc = avformat_alloc_context();
3375.     if (!oc) {
3376.         print_error(filename, AVERROR(ENOMEM));
              ^
3377.         av_exit(1);
3378.     }

cmdutils.c:291:1: start of procedure print_error()
  289. }
  290. 
  291. void print_error(const char *filename, int err)
       ^
  292. {
  293.     switch(err) {

cmdutils.c:293:5: 
  291. void print_error(const char *filename, int err)
  292. {
  293.     switch(err) {
           ^
  294.     case AVERROR_NUMEXPECTED:
  295.         fprintf(stderr, "%s: Incorrect image filename syntax.\n"

cmdutils.c:294:5: Switch condition is false. Skipping switch case
  292. {
  293.     switch(err) {
  294.     case AVERROR_NUMEXPECTED:
           ^
  295.         fprintf(stderr, "%s: Incorrect image filename syntax.\n"
  296.                 "Use '%%d' to specify the image number:\n"

cmdutils.c:301:5: Switch condition is false. Skipping switch case
  299.                 filename);
  300.         break;
  301.     case AVERROR_INVALIDDATA:
           ^
  302.         fprintf(stderr, "%s: Error while parsing header\n", filename);
  303.         break;

cmdutils.c:304:5: Switch condition is false. Skipping switch case
  302.         fprintf(stderr, "%s: Error while parsing header\n", filename);
  303.         break;
  304.     case AVERROR_NOFMT:
           ^
  305.         fprintf(stderr, "%s: Unknown format\n", filename);
  306.         break;

cmdutils.c:307:5: Switch condition is false. Skipping switch case
  305.         fprintf(stderr, "%s: Unknown format\n", filename);
  306.         break;
  307.     case AVERROR(EIO):
           ^
  308.         fprintf(stderr, "%s: I/O error occurred\n"
  309.                 "Usually that means that input file is truncated and/or corrupted.\n",

cmdutils.c:312:5: Switch condition is true. Entering switch case
  310.                 filename);
  311.         break;
  312.     case AVERROR(ENOMEM):
           ^
  313.         fprintf(stderr, "%s: memory allocation error occurred\n", filename);
  314.         break;

cmdutils.c:313:9: 
  311.         break;
  312.     case AVERROR(ENOMEM):
  313.         fprintf(stderr, "%s: memory allocation error occurred\n", filename);
               ^
  314.         break;
  315.     case AVERROR(ENOENT):

cmdutils.c:327:1: return from a call to print_error
  325.         break;
  326.     }
  327. }
       ^
  328. 
  329. #define PRINT_LIB_VERSION(outstream,libname,LIBNAME,indent)             \

ffmpeg.c:3377:9: Skipping av_exit(): empty list of specs
3375.     if (!oc) {
3376.         print_error(filename, AVERROR(ENOMEM));
3377.         av_exit(1);
              ^
3378.     }
3379. 

ffmpeg.c:3380:9: Taking true branch
3378.     }
3379. 
3380.     if (last_asked_format) {
              ^
3381.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3382.         if (!file_oformat) {

ffmpeg.c:3381:9: Skipping av_guess_format(): empty list of specs
3379. 
3380.     if (last_asked_format) {
3381.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
              ^
3382.         if (!file_oformat) {
3383.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);

ffmpeg.c:3382:14: Taking false branch
3380.     if (last_asked_format) {
3381.         file_oformat = av_guess_format(last_asked_format, NULL, NULL);
3382.         if (!file_oformat) {
                   ^
3383.             fprintf(stderr, "Requested output format '%s' is not a suitable output format\n", last_asked_format);
3384.             av_exit(1);

ffmpeg.c:3386:9: 
3384.             av_exit(1);
3385.         }
3386.         last_asked_format = NULL;
              ^
3387.     } else {
3388.         file_oformat = av_guess_format(NULL, filename, NULL);

ffmpeg.c:3396:5: 
3394.     }
3395. 
3396.     oc->oformat = file_oformat;
          ^
3397.     av_strlcpy(oc->filename, filename, sizeof(oc->filename));
3398. 
