libavcodec/utils.c:284: error: Null Dereference
  pointer `desc` last assigned on line 283 could be null and is dereferenced at line 284, column 24.

libavcodec/utils.c:281:1: start of procedure avcodec_align_dimensions()
279. }
280. 
281. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
     ^
282. {
283.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);

libavcodec/utils.c:283:5: 
281. void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height)
282. {
283.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
         ^
284.     int chroma_shift = desc->log2_chroma_w;
285.     int linesize_align[AV_NUM_DATA_POINTERS];

libavutil/pixdesc.c:1599:1: start of procedure av_pix_fmt_desc_get()
  1597. }
  1598. 
  1599. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
        ^
  1600. {
  1601.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)

libavutil/pixdesc.c:1601:9: Taking false branch
  1599. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1600. {
  1601.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                ^
  1602.         return NULL;
  1603.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1601:24: Taking true branch
  1599. const AVPixFmtDescriptor *av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
  1600. {
  1601.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
                               ^
  1602.         return NULL;
  1603.     return &av_pix_fmt_descriptors[pix_fmt];

libavutil/pixdesc.c:1602:9: 
  1600. {
  1601.     if (pix_fmt < 0 || pix_fmt >= AV_PIX_FMT_NB)
  1602.         return NULL;
                ^
  1603.     return &av_pix_fmt_descriptors[pix_fmt];
  1604. }

libavutil/pixdesc.c:1604:1: return from a call to av_pix_fmt_desc_get
  1602.         return NULL;
  1603.     return &av_pix_fmt_descriptors[pix_fmt];
  1604. }
        ^
  1605. 
  1606. const AVPixFmtDescriptor *av_pix_fmt_desc_next(const AVPixFmtDescriptor *prev)

libavcodec/utils.c:284:5: 
282. {
283.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(s->pix_fmt);
284.     int chroma_shift = desc->log2_chroma_w;
         ^
285.     int linesize_align[AV_NUM_DATA_POINTERS];
286.     int align;
