libavcodec/mpegvideo_enc.c:1111: error: Null Dereference
  pointer `c` last assigned on line 1092 could be null and is dereferenced at line 1111, column 5.

libavcodec/mpegvideo_enc.c:1089:1: start of procedure estimate_best_b_count()
1087. }
1088. 
1089. static int estimate_best_b_count(MpegEncContext *s)
      ^
1090. {
1091.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);

libavcodec/mpegvideo_enc.c:1091:5: Skipping avcodec_find_encoder(): empty list of specs
1089. static int estimate_best_b_count(MpegEncContext *s)
1090. {
1091.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);
          ^
1092.     AVCodecContext *c = avcodec_alloc_context3(NULL);
1093.     AVFrame input[FF_MAX_B_FRAMES + 2];

libavcodec/mpegvideo_enc.c:1092:5: 
1090. {
1091.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);
1092.     AVCodecContext *c = avcodec_alloc_context3(NULL);
          ^
1093.     AVFrame input[FF_MAX_B_FRAMES + 2];
1094.     const int scale = s->avctx->brd_scale;

libavcodec/options.c:126:1: start of procedure avcodec_alloc_context3()
  124. }
  125. 
  126. AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
       ^
  127. {
  128.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));

libavcodec/options.c:128:5: 
  126. AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
  127. {
  128.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
           ^
  129. 
  130.     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:72:9: Taking false branch
    70. 
    71.     /* let's disallow possible ambiguous cases */
    72.     if (size > (INT_MAX-32) || !size)
                ^
    73.         return NULL;
    74. 

libavutil/mem.c:72:33: Taking false branch
    70. 
    71.     /* let's disallow possible ambiguous cases */
    72.     if (size > (INT_MAX-32) || !size)
                                        ^
    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_ALIGNED_MALLOC

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, size_t size)

libavcodec/options.c:130:8: Taking true branch
  128.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  129. 
  130.     if(avctx==NULL) return NULL;
              ^
  131. 
  132.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:130:21: 
  128.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  129. 
  130.     if(avctx==NULL) return NULL;
                           ^
  131. 
  132.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:138:1: return from a call to avcodec_alloc_context3
  136. 
  137.     return avctx;
  138. }
       ^
  139. 
  140. int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)

libavcodec/mpegvideo_enc.c:1094:5: 
1092.     AVCodecContext *c = avcodec_alloc_context3(NULL);
1093.     AVFrame input[FF_MAX_B_FRAMES + 2];
1094.     const int scale = s->avctx->brd_scale;
          ^
1095.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1096.     int64_t best_rd  = INT64_MAX;

libavcodec/mpegvideo_enc.c:1096:5: 
1094.     const int scale = s->avctx->brd_scale;
1095.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1096.     int64_t best_rd  = INT64_MAX;
          ^
1097.     int best_b_count = -1;
1098. 

libavcodec/mpegvideo_enc.c:1097:5: 
1095.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1096.     int64_t best_rd  = INT64_MAX;
1097.     int best_b_count = -1;
          ^
1098. 
1099.     assert(scale >= 0 && scale <= 3);

libavcodec/mpegvideo_enc.c:1099:5: 
1097.     int best_b_count = -1;
1098. 
1099.     assert(scale >= 0 && scale <= 3);
          ^
1100. 
1101.     //emms_c();

libavcodec/mpegvideo_enc.c:1103:5: 
1101.     //emms_c();
1102.     //s->next_picture_ptr->quality;
1103.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
          ^
1104.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1105.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];

libavcodec/mpegvideo_enc.c:1105:5: 
1103.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
1104.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1105.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
          ^
1106.     if (!b_lambda) // FIXME we should do this somewhere else
1107.         b_lambda = p_lambda;

libavcodec/mpegvideo_enc.c:1106:10: Taking false branch
1104.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1105.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
1106.     if (!b_lambda) // FIXME we should do this somewhere else
               ^
1107.         b_lambda = p_lambda;
1108.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>

libavcodec/mpegvideo_enc.c:1108:5: 
1106.     if (!b_lambda) // FIXME we should do this somewhere else
1107.         b_lambda = p_lambda;
1108.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>
          ^
1109.                FF_LAMBDA_SHIFT;
1110. 

libavcodec/mpegvideo_enc.c:1111:5: 
1109.                FF_LAMBDA_SHIFT;
1110. 
1111.     c->width        = s->width  >> scale;
          ^
1112.     c->height       = s->height >> scale;
1113.     c->flags        = CODEC_FLAG_QSCALE | CODEC_FLAG_PSNR |
