libavcodec/mpegvideo_enc.c:1112: error: Null Dereference
  pointer `c` last assigned on line 1093 could be null and is dereferenced at line 1112, column 5.

libavcodec/mpegvideo_enc.c:1090:1: start of procedure estimate_best_b_count()
1088. }
1089. 
1090. static int estimate_best_b_count(MpegEncContext *s)
      ^
1091. {
1092.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);

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

libavcodec/utils.c:1510:1: start of procedure avcodec_find_encoder()
  1508. }
  1509. 
  1510. AVCodec *avcodec_find_encoder(enum AVCodecID id)
        ^
  1511. {
  1512.     return find_encdec(id, 1);

libavcodec/utils.c:1512:5: Skipping find_encdec(): empty list of specs
  1510. AVCodec *avcodec_find_encoder(enum AVCodecID id)
  1511. {
  1512.     return find_encdec(id, 1);
            ^
  1513. }
  1514. 

libavcodec/utils.c:1513:1: return from a call to avcodec_find_encoder
  1511. {
  1512.     return find_encdec(id, 1);
  1513. }
        ^
  1514. 
  1515. AVCodec *avcodec_find_encoder_by_name(const char *name)

libavcodec/mpegvideo_enc.c:1093:5: 
1091. {
1092.     AVCodec *codec    = avcodec_find_encoder(s->avctx->codec_id);
1093.     AVCodecContext *c = avcodec_alloc_context3(NULL);
          ^
1094.     AVFrame input[FF_MAX_B_FRAMES + 2];
1095.     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:72:35: 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:1095:5: 
1093.     AVCodecContext *c = avcodec_alloc_context3(NULL);
1094.     AVFrame input[FF_MAX_B_FRAMES + 2];
1095.     const int scale = s->avctx->brd_scale;
          ^
1096.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1097.     int64_t best_rd  = INT64_MAX;

libavcodec/mpegvideo_enc.c:1097:5: 
1095.     const int scale = s->avctx->brd_scale;
1096.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1097.     int64_t best_rd  = INT64_MAX;
          ^
1098.     int best_b_count = -1;
1099. 

libavcodec/mpegvideo_enc.c:1098:5: 
1096.     int i, j, out_size, p_lambda, b_lambda, lambda2;
1097.     int64_t best_rd  = INT64_MAX;
1098.     int best_b_count = -1;
          ^
1099. 
1100.     assert(scale >= 0 && scale <= 3);

libavcodec/mpegvideo_enc.c:1100:5: 
1098.     int best_b_count = -1;
1099. 
1100.     assert(scale >= 0 && scale <= 3);
          ^
1101. 
1102.     //emms_c();

libavcodec/mpegvideo_enc.c:1104:5: 
1102.     //emms_c();
1103.     //s->next_picture_ptr->quality;
1104.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
          ^
1105.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1106.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];

libavcodec/mpegvideo_enc.c:1106:5: 
1104.     p_lambda = s->last_lambda_for[AV_PICTURE_TYPE_P];
1105.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1106.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
          ^
1107.     if (!b_lambda) // FIXME we should do this somewhere else
1108.         b_lambda = p_lambda;

libavcodec/mpegvideo_enc.c:1107:10: Taking false branch
1105.     //p_lambda * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
1106.     b_lambda = s->last_lambda_for[AV_PICTURE_TYPE_B];
1107.     if (!b_lambda) // FIXME we should do this somewhere else
               ^
1108.         b_lambda = p_lambda;
1109.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>

libavcodec/mpegvideo_enc.c:1109:5: 
1107.     if (!b_lambda) // FIXME we should do this somewhere else
1108.         b_lambda = p_lambda;
1109.     lambda2  = (b_lambda * b_lambda + (1 << FF_LAMBDA_SHIFT) / 2) >>
          ^
1110.                FF_LAMBDA_SHIFT;
1111. 

libavcodec/mpegvideo_enc.c:1112:5: 
1110.                FF_LAMBDA_SHIFT;
1111. 
1112.     c->width        = s->width  >> scale;
          ^
1113.     c->height       = s->height >> scale;
1114.     c->flags        = CODEC_FLAG_QSCALE | CODEC_FLAG_PSNR |
