libavcodec/mpegvideo_enc.c:966: error: Null Dereference
  pointer `c` last assigned on line 949 could be null and is dereferenced at line 966, column 5.

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

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

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

libavcodec/options.c:536:1: start of procedure avcodec_alloc_context()
  534. }
  535. 
  536. AVCodecContext *avcodec_alloc_context(void){
       ^
  537.     return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
  538. }

libavcodec/options.c:537:5: 
  535. 
  536. AVCodecContext *avcodec_alloc_context(void){
  537.     return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
           ^
  538. }
  539. 

libavcodec/options.c:522:1: start of procedure avcodec_alloc_context2()
    520. }
    521. 
    522. AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){
         ^
    523.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
    524. 

libavcodec/options.c:523:5: 
    521. 
    522. AVCodecContext *avcodec_alloc_context2(enum AVMediaType codec_type){
    523.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
             ^
    524. 
    525.     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:525:8: Taking true branch
    523.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
    524. 
    525.     if(avctx==NULL) return NULL;
                ^
    526. 
    527.     avcodec_get_context_defaults2(avctx, codec_type);

libavcodec/options.c:525:21: 
    523.     AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
    524. 
    525.     if(avctx==NULL) return NULL;
                             ^
    526. 
    527.     avcodec_get_context_defaults2(avctx, codec_type);

libavcodec/options.c:530:1: return from a call to avcodec_alloc_context2
    528. 
    529.     return avctx;
    530. }
         ^
    531. 
    532. void avcodec_get_context_defaults(AVCodecContext *s){

libavcodec/options.c:538:1: return from a call to avcodec_alloc_context
  536. AVCodecContext *avcodec_alloc_context(void){
  537.     return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
  538. }
       ^
  539. 
  540. int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)

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

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

libavcodec/mpegvideo_enc.c:954:5: 
952.     int i, j, out_size, p_lambda, b_lambda, lambda2;
953.     int outbuf_size= s->width * s->height; //FIXME
954.     uint8_t *outbuf= av_malloc(outbuf_size);
         ^
955.     int64_t best_rd= INT64_MAX;
956.     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:955:5: 
953.     int outbuf_size= s->width * s->height; //FIXME
954.     uint8_t *outbuf= av_malloc(outbuf_size);
955.     int64_t best_rd= INT64_MAX;
         ^
956.     int best_b_count= -1;
957. 

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

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

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

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

libavcodec/mpegvideo_enc.c:963:9: Taking false branch
961.     p_lambda= s->last_lambda_for[AV_PICTURE_TYPE_P]; //s->next_picture_ptr->quality;
962.     b_lambda= s->last_lambda_for[AV_PICTURE_TYPE_B]; //p_lambda *FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset;
963.     if(!b_lambda) b_lambda= p_lambda; //FIXME we should do this somewhere else
             ^
964.     lambda2= (b_lambda*b_lambda + (1<<FF_LAMBDA_SHIFT)/2 ) >> FF_LAMBDA_SHIFT;
965. 

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

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