libavcodec/mpegvideo_enc.c:965: error: Null Dereference
  pointer `c` last assigned on line 948 could be null and is dereferenced at line 965, column 5.

libavcodec/mpegvideo_enc.c:946:1: start of procedure estimate_best_b_count()
944. }
945. 
946. static int estimate_best_b_count(MpegEncContext *s){
     ^
947.     AVCodec *codec= avcodec_find_encoder(s->avctx->codec_id);
948.     AVCodecContext *c = avcodec_alloc_context3(NULL);

libavcodec/mpegvideo_enc.c:947:5: Skipping avcodec_find_encoder(): empty list of specs
945. 
946. static int estimate_best_b_count(MpegEncContext *s){
947.     AVCodec *codec= avcodec_find_encoder(s->avctx->codec_id);
         ^
948.     AVCodecContext *c = avcodec_alloc_context3(NULL);
949.     AVFrame input[FF_MAX_B_FRAMES+2];

libavcodec/mpegvideo_enc.c:948:5: 
946. static int estimate_best_b_count(MpegEncContext *s){
947.     AVCodec *codec= avcodec_find_encoder(s->avctx->codec_id);
948.     AVCodecContext *c = avcodec_alloc_context3(NULL);
         ^
949.     AVFrame input[FF_MAX_B_FRAMES+2];
950.     const int scale= s->avctx->brd_scale;

libavcodec/options.c:541:1: start of procedure avcodec_alloc_context3()
  539. }
  540. 
  541. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
       ^
  542.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  543. 

libavcodec/options.c:542:5: 
  540. 
  541. AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
  542.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
           ^
  543. 
  544.     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:544:8: Taking true branch
  542.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  543. 
  544.     if(avctx==NULL) return NULL;
              ^
  545. 
  546.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:544:21: 
  542.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
  543. 
  544.     if(avctx==NULL) return NULL;
                           ^
  545. 
  546.     if(avcodec_get_context_defaults3(avctx, codec) < 0){

libavcodec/options.c:552:1: return from a call to avcodec_alloc_context3
  550. 
  551.     return avctx;
  552. }
       ^
  553. 
  554. #if FF_API_ALLOC_CONTEXT

libavcodec/mpegvideo_enc.c:950:5: 
948.     AVCodecContext *c = avcodec_alloc_context3(NULL);
949.     AVFrame input[FF_MAX_B_FRAMES+2];
950.     const int scale= s->avctx->brd_scale;
         ^
951.     int i, j, out_size, p_lambda, b_lambda, lambda2;
952.     int outbuf_size= s->width * s->height; //FIXME

libavcodec/mpegvideo_enc.c:952:5: 
950.     const int scale= s->avctx->brd_scale;
951.     int i, j, out_size, p_lambda, b_lambda, lambda2;
952.     int outbuf_size= s->width * s->height; //FIXME
         ^
953.     uint8_t *outbuf= av_malloc(outbuf_size);
954.     int64_t best_rd= INT64_MAX;

libavcodec/mpegvideo_enc.c:953:5: 
951.     int i, j, out_size, p_lambda, b_lambda, lambda2;
952.     int outbuf_size= s->width * s->height; //FIXME
953.     uint8_t *outbuf= av_malloc(outbuf_size);
         ^
954.     int64_t best_rd= INT64_MAX;
955.     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:954:5: 
952.     int outbuf_size= s->width * s->height; //FIXME
953.     uint8_t *outbuf= av_malloc(outbuf_size);
954.     int64_t best_rd= INT64_MAX;
         ^
955.     int best_b_count= -1;
956. 

libavcodec/mpegvideo_enc.c:955:5: 
953.     uint8_t *outbuf= av_malloc(outbuf_size);
954.     int64_t best_rd= INT64_MAX;
955.     int best_b_count= -1;
         ^
956. 
957.     assert(scale>=0 && scale <=3);

libavcodec/mpegvideo_enc.c:957:5: 
955.     int best_b_count= -1;
956. 
957.     assert(scale>=0 && scale <=3);
         ^
958. 
959. //    emms_c();

libavcodec/mpegvideo_enc.c:960:5: 
958. 
959. //    emms_c();
960.     p_lambda= s->last_lambda_for[AV_PICTURE_TYPE_P]; //s->next_picture_ptr->quality;
         ^
961.     b_lambda= s->last_lambda_for[AV_PICTURE_TYPE_B]; //p_lambda *FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
962.     if(!b_lambda) b_lambda= p_lambda; //FIXME we should do this somewhere else

libavcodec/mpegvideo_enc.c:961:5: 
959. //    emms_c();
960.     p_lambda= s->last_lambda_for[AV_PICTURE_TYPE_P]; //s->next_picture_ptr->quality;
961.     b_lambda= s->last_lambda_for[AV_PICTURE_TYPE_B]; //p_lambda *FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
         ^
962.     if(!b_lambda) b_lambda= p_lambda; //FIXME we should do this somewhere else
963.     lambda2= (b_lambda*b_lambda + (1<<FF_LAMBDA_SHIFT)/2 ) >> FF_LAMBDA_SHIFT;

libavcodec/mpegvideo_enc.c:962:9: Taking false branch
960.     p_lambda= s->last_lambda_for[AV_PICTURE_TYPE_P]; //s->next_picture_ptr->quality;
961.     b_lambda= s->last_lambda_for[AV_PICTURE_TYPE_B]; //p_lambda *FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
962.     if(!b_lambda) b_lambda= p_lambda; //FIXME we should do this somewhere else
             ^
963.     lambda2= (b_lambda*b_lambda + (1<<FF_LAMBDA_SHIFT)/2 ) >> FF_LAMBDA_SHIFT;
964. 

libavcodec/mpegvideo_enc.c:963:5: 
961.     b_lambda= s->last_lambda_for[AV_PICTURE_TYPE_B]; //p_lambda *FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
962.     if(!b_lambda) b_lambda= p_lambda; //FIXME we should do this somewhere else
963.     lambda2= (b_lambda*b_lambda + (1<<FF_LAMBDA_SHIFT)/2 ) >> FF_LAMBDA_SHIFT;
         ^
964. 
965.     c->width = s->width >> scale;

libavcodec/mpegvideo_enc.c:965:5: 
963.     lambda2= (b_lambda*b_lambda + (1<<FF_LAMBDA_SHIFT)/2 ) >> FF_LAMBDA_SHIFT;
964. 
965.     c->width = s->width >> scale;
         ^
966.     c->height= s->height>> scale;
967.     c->flags= CODEC_FLAG_QSCALE | CODEC_FLAG_PSNR | CODEC_FLAG_INPUT_PRESERVED /*| CODEC_FLAG_EMU_EDGE*/;
