libavcodec/mpegvideo_enc.c:1074: error: Null Dereference
  pointer `c` last assigned on line 1053 could be null and is dereferenced at line 1074, column 5.

libavcodec/mpegvideo_enc.c:1050:1: start of procedure estimate_best_b_count()
1048. }
1049. 
1050. static int estimate_best_b_count(MpegEncContext *s)
      ^
1051. {
1052.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);

libavcodec/mpegvideo_enc.c:1052:5: Skipping avcodec_find_encoder(): empty list of specs
1050. static int estimate_best_b_count(MpegEncContext *s)
1051. {
1052.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);
          ^
1053.     AVCodecContext *c = avcodec_alloc_context3(NULL);
1054.     AVFrame input[FF_MAX_B_FRAMES + 2];

libavcodec/mpegvideo_enc.c:1053:5: 
1051. {
1052.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);
1053.     AVCodecContext *c = avcodec_alloc_context3(NULL);
          ^
1054.     AVFrame input[FF_MAX_B_FRAMES + 2];
1055.     const int scale = s->avctx->brd_scale;

libavcodec/options.c:473:1: start of procedure avcodec_alloc_context3()
  471. }
  472. 
  473. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
       ^
  474.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  475. 

libavcodec/options.c:474:5: 
  472. 
  473. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
  474.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
           ^
  475. 
  476.     if(avctx==NULL) return NULL;

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)

libavcodec/options.c:476:8: Taking true branch
  474.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  475. 
  476.     if(avctx==NULL) return NULL;
              ^
  477. 
  478.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:476:21: 
  474.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  475. 
  476.     if(avctx==NULL) return NULL;
                           ^
  477. 
  478.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:484:1: return from a call to avcodec_alloc_context3
  482. 
  483.     return avctx;
  484. }
       ^
  485. 
  486. int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)

libavcodec/mpegvideo_enc.c:1055:5: 
1053.     AVCodecContext *c = avcodec_alloc_context3(NULL);
1054.     AVFrame input[FF_MAX_B_FRAMES + 2];
1055.     const int scale = s->avctx->brd_scale;
          ^
1056.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1057.     int outbuf_size  = s->width * s->height; // FIXME

libavcodec/mpegvideo_enc.c:1057:5: 
1055.     const int scale = s->avctx->brd_scale;
1056.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1057.     int outbuf_size  = s->width * s->height; // FIXME
          ^
1058.     uint8_t *outbuf  = av_malloc(outbuf_size);
1059.     int64_t best_rd  = INT64_MAX;

libavcodec/mpegvideo_enc.c:1058:5: 
1056.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1057.     int outbuf_size  = s->width * s->height; // FIXME
1058.     uint8_t *outbuf  = av_malloc(outbuf_size);
          ^
1059.     int64_t best_rd  = INT64_MAX;
1060.     int best_b_count = -1;

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)

libavcodec/mpegvideo_enc.c:1059:5: 
1057.     int outbuf_size  = s->width * s->height; // FIXME
1058.     uint8_t *outbuf  = av_malloc(outbuf_size);
1059.     int64_t best_rd  = INT64_MAX;
          ^
1060.     int best_b_count = -1;
1061. 

libavcodec/mpegvideo_enc.c:1060:5: 
1058.     uint8_t *outbuf  = av_malloc(outbuf_size);
1059.     int64_t best_rd  = INT64_MAX;
1060.     int best_b_count = -1;
          ^
1061. 
1062.     assert(scale >= 0 && scale <= 3);

libavcodec/mpegvideo_enc.c:1062:5: 
1060.     int best_b_count = -1;
1061. 
1062.     assert(scale >= 0 && scale <= 3);
          ^
1063. 
1064.     //emms_c();

libavcodec/mpegvideo_enc.c:1066:5: 
1064.     //emms_c();
1065.     //s->next_picture_ptr->quality;
1066.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
          ^
1067.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1068.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];

libavcodec/mpegvideo_enc.c:1068:5: 
1066.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
1067.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1068.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
          ^
1069.     if (!b_lambda) // FIXME we should do this somewhere else
1070.         b_lambda = p_lambda;

libavcodec/mpegvideo_enc.c:1069:10: Taking false branch
1067.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1068.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
1069.     if (!b_lambda) // FIXME we should do this somewhere else
               ^
1070.         b_lambda = p_lambda;
1071.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>

libavcodec/mpegvideo_enc.c:1071:5: 
1069.     if (!b_lambda) // FIXME we should do this somewhere else
1070.         b_lambda = p_lambda;
1071.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>
          ^
1072.                FF_LAMBDA_SHIFT;
1073. 

libavcodec/mpegvideo_enc.c:1074:5: 
1072.                FF_LAMBDA_SHIFT;
1073. 
1074.     c->width        = s->width  >> scale;
          ^
1075.     c->height       = s->height >> scale;
1076.     c->flags        = CODEC_FLAG_QSCALE | CODEC_FLAG_PSNR |
