ffmpeg.c:3206: error: Null Dereference
  pointer `st` last assigned on line 3201 could be null and is dereferenced at line 3206, column 35.

ffmpeg.c:3196:1: start of procedure new_subtitle_stream()
3194. }
3195. 
3196. static void new_subtitle_stream(AVFormatContext *oc)
      ^
3197. {
3198.     AVStream *st;

ffmpeg.c:3201:5: 
3199.     AVCodecContext *subtitle_enc;
3200. 
3201.     st = av_new_stream(oc, oc->nb_streams);
          ^
3202.     if (!st) {
3203.         fprintf(stderr, "Could not alloc stream\n");

libavformat/utils.c:2336:1: start of procedure av_new_stream()
  2334. }
  2335. 
  2336. AVStream *av_new_stream(AVFormatContext *s, int id)
        ^
  2337. {
  2338.     AVStream *st;

libavformat/utils.c:2341:9: Taking true branch
  2339.     int i;
  2340. 
  2341.     if (s->nb_streams >= MAX_STREAMS)
                ^
  2342.         return NULL;
  2343. 

libavformat/utils.c:2342:9: 
  2340. 
  2341.     if (s->nb_streams >= MAX_STREAMS)
  2342.         return NULL;
                ^
  2343. 
  2344.     st = av_mallocz(sizeof(AVStream));

libavformat/utils.c:2375:1: return from a call to av_new_stream
  2373.     s->streams[s->nb_streams++] = st;
  2374.     return st;
  2375. }
        ^
  2376. 
  2377. AVProgram *av_new_program(AVFormatContext *ac, int id)

ffmpeg.c:3202:10: Taking true branch
3200. 
3201.     st = av_new_stream(oc, oc->nb_streams);
3202.     if (!st) {
               ^
3203.         fprintf(stderr, "Could not alloc stream\n");
3204.         av_exit(1);

ffmpeg.c:3203:9: 
3201.     st = av_new_stream(oc, oc->nb_streams);
3202.     if (!st) {
3203.         fprintf(stderr, "Could not alloc stream\n");
              ^
3204.         av_exit(1);
3205.     }

ffmpeg.c:3204:9: Skipping av_exit(): empty list of specs
3202.     if (!st) {
3203.         fprintf(stderr, "Could not alloc stream\n");
3204.         av_exit(1);
              ^
3205.     }
3206.     avcodec_get_context_defaults2(st->codec, CODEC_TYPE_SUBTITLE);

ffmpeg.c:3206:5: 
3204.         av_exit(1);
3205.     }
3206.     avcodec_get_context_defaults2(st->codec, CODEC_TYPE_SUBTITLE);
          ^
3207. 
3208.     bitstream_filters[nb_output_files][oc->nb_streams - 1]= subtitle_bitstream_filters;
